### /api/4/site/info

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Get information about this taginfo site.

```APIDOC
## GET /api/4/site/info

### Description
Get information about this taginfo site.

### Method
GET

### Endpoint
/api/4/site/info

### Response
#### Success Response (200)
- **url** (string) - URL
- **name** (string) - Name
- **description** (string) - Description
- **icon** (string) - Path to icon which appears on the lop left corner of all pages.
- **contact** (string) - Contact information to admin.
- **area** (string) - Description of area covered.

#### Response Example
```json
{
  "url": "http://taginfo.example.com",
  "name": "Taginfo Example",
  "description": "An example Taginfo instance.",
  "icon": "/images/icon.png",
  "contact": "admin@example.com",
  "area": "Global"
}
```
```

--------------------------------

### /api/4/site/config/geodistribution

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Get information about the background map for distribution charts.

```APIDOC
## GET /api/4/site/config/geodistribution

### Description
Get information about the background map for distribution charts.

### Method
GET

### Endpoint
/api/4/site/config/geodistribution

### Response
#### Success Response (200)
- **width** (integer) - width of background image
- **height** (integer) - height of background image
- **scale_image** (float) - scale factor for images
- **scale_compare_image** (float) - scale factor for comparison images
- **background_image** (string) - URL of background image
- **image_attribution** (string) - map attribution for comparison background

#### Response Example
```json
{
  "width": 1024,
  "height": 768,
  "scale_image": 1.0,
  "scale_compare_image": 0.8,
  "background_image": "http://example.com/background.png",
  "image_attribution": "© OpenStreetMap contributors"
}
```
```

--------------------------------

### /api/4/site/sources

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Get information about the data sources used by Taginfo.

```APIDOC
## GET /api/4/site/sources

### Description
Get information about the data sources used by Taginfo.

### Method
GET

### Endpoint
/api/4/site/sources

### Response
#### Success Response (200)
- **data** (array of hashes) - Array with results.
  - **id** (string) - Id
  - **name** (string) - Name
  - **data_until** (string) - All changes in the source until this date are reflected in taginfo.
  - **update_start** (string) - Date/Timestamp when last update was started.
  - **update_end** (string) - Date/Timestamp when last update was finished.

#### Response Example
```json
{
  "data": [
    {
      "id": "osm",
      "name": "OpenStreetMap",
      "data_until": "2023-10-27T10:00:00Z",
      "update_start": "2023-10-27T09:00:00Z",
      "update_end": "2023-10-27T09:30:00Z"
    }
  ]
}
```
```

--------------------------------

### /api/4/tag/distribution/ways

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Get a map image showing the distribution of a specific tag on ways in the database. Returns an empty image if no map is available.

```APIDOC
## GET /api/4/tag/distribution/ways

### Description
Get map with distribution of this tag in the database (ways only). Will return empty image if there is no map available for this tag.

### Method
GET

### Endpoint
`/api/4/tag/distribution/ways`

### Parameters
#### Query Parameters
- **key** (string) - Required - Tag key.
- **value** (string) - Required - Tag value.

### Result
PNG image representing the tag distribution on ways.
```

--------------------------------

### Get Wikidata Keys

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Retrieves all Wikidata entries associated with keys. Supports filtering by language and a query string, with options for paging and sorting.

```APIDOC
## GET /api/4/wikidata/keys

### Description
Get all wikidata entries about keys. Supports filtering by language and a query string, with options for paging and sorting.

### Method
GET

### Endpoint
`/api/4/wikidata/keys`

### Parameters
#### Query Parameters
- **lang** (string) - Optional - Language for description (default: 'en').
- **query** (string) - Optional - Only show results matching this string (substring match on key/item code/item description).

#### Paging
This endpoint supports paging.

#### Sort
- **key**
- **item**

### Result
- **total** (INT) - Total number of results.
- **page** (INT) - Result page number (first has page number 1).
- **rp** (INT) - Results per page.
- **url** (STRING) - URL of the request.
- **data_until** (STRING) - All changes in the source until this date are reflected in this taginfo result.
- **data** (ARRAY OF HASHES) - Array with results.
  - **item** (STRING) - The wikidata items Q or P code.
  - **key** (STRING) - The OSM key.
  - **description** (STRING) - The description of the wikidata item.

### Request Example
`/api/4/wikidata/keys?lang=fr&page=1&rp=10&sortname=item&sortorder=asc`
```

--------------------------------

### /api/4/tags/list

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Get information on given tags or all tags documented on the wiki with a specific key. This endpoint allows querying for specific tags or retrieving all tags associated with a given key.

```APIDOC
## GET /api/4/tags/list

### Description
Get information on given tags or all tags documented on the wiki with given key.

### Method
GET

### Endpoint
/api/4/tags/list

### Parameters
#### Query Parameters
- **key** (string) - Optional - Key (optional)
- **tags** (string) - Optional - Comma-separated list of tags in format key1=value1a,value1b,...,key2=value2a,value2b,... (optional)

### Result
- **total** (INT) - Total number of results.
- **url** (STRING) - URL of the request.
- **data_until** (STRING) - All changes in the source until this date are reflected in this taginfo result.
- **data** (ARRAY OF HASHES) - Array with results.
  - **key** (STRING) - Key
  - **value** (STRING) - Value
  - **in_wiki** (BOOL) - In there at least one wiki page for this tag?
  - **count_all** (INT) - Number of objects in the OSM database with this tag.
  - **count_all_fraction** (FLOAT) - Number of objects in relation to all objects.
  - **count_nodes** (INT) - Number of nodes in the OSM database with this tag.
  - **count_nodes_fraction** (FLOAT) - Number of nodes in relation to all tagged nodes.
  - **count_ways** (INT) - Number of ways in the OSM database with this tag.
  - **count_ways_fraction** (FLOAT) - Number of ways in relation to all ways.
  - **count_relations** (INT) - Number of relations in the OSM database with this tag.
  - **count_relations_fraction** (FLOAT) - Number of relations in relation to all relations.
  - **on_node** (BOOL) - Is this a tag for nodes?
  - **on_way** (BOOL) - Is this a tag for ways?
  - **on_area** (BOOL) - Is this a tag for areas?
  - **on_relation** (BOOL) - Is this a tag for relations?
  - **wiki** (HASH) - Hash with language codes as keys and values are hashes with the following keys:
    - **description** (STRING) - Description of this tag.
    - **image** (HASH) - Optional hash with information about descriptive image:
      - **image** (STRING) - Wiki page title of associated image.
      - **width** (INT) - Width of image.
      - **height** (INT) - Height of image.
      - **mime** (STRING) - MIME type of image.
      - **image_url** (STRING) - Image URL
      - **thumb_url_prefix** (STRING) - Prefix of thumbnail URL.
      - **thumb_url_suffix** (STRING) - Suffix of thumbnail URL.
    - **osmcarto_rendering** (HASH) - Optional hash with information about default rendering:
      - **image** (STRING) - Wiki page title of associated image.
      - **width** (INT) - Width of image.
      - **height** (INT) - Height of image.
      - **mime** (STRING) - MIME type of image.
      - **image_url** (STRING) - Image URL
      - **thumb_url_prefix** (STRING) - Prefix of thumbnail URL.
      - **thumb_url_suffix** (STRING) - Suffix of thumbnail URL.

### Notes
You have to either use the `key` parameter or the `tags` parameter.
```

--------------------------------

### Get Wikidata Tags

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Retrieves all Wikidata entries associated with tags. Supports filtering by language and a query string, with options for paging and sorting.

```APIDOC
## GET /api/4/wikidata/tags

### Description
Get all wikidata entries about tags. Supports filtering by language and a query string, with options for paging and sorting.

### Method
GET

### Endpoint
`/api/4/wikidata/tags`

### Parameters
#### Query Parameters
- **lang** (string) - Optional - Language for description (default: 'en').
- **query** (string) - Optional - Only show results matching this string (substring match on key/value/item code/item description).

#### Paging
This endpoint supports paging.

#### Sort
- **tag**
- **item**

### Result
- **total** (INT) - Total number of results.
- **page** (INT) - Result page number (first has page number 1).
- **rp** (INT) - Results per page.
- **url** (STRING) - URL of the request.
- **data_until** (STRING) - All changes in the source until this date are reflected in this taginfo result.
- **data** (ARRAY OF HASHES) - Array with results.
  - **item** (STRING) - The wikidata items Q or P code.
  - **key** (STRING) - The OSM key.
  - **value** (STRING) - The OSM value.
  - **description** (STRING) - The description of the wikidata item.

### Request Example
`/api/4/wikidata/tags?lang=fr&page=1&rp=10&sortname=item&sortorder=asc`
```

--------------------------------

### /api/4/tag/overview

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Show various data for a given tag, including project mentions, wiki page availability, and object counts.

```APIDOC
## GET /api/4/tag/overview

### Description
Show various data for given tag.

### Method
GET

### Endpoint
`/api/4/tag/overview`

### Parameters
#### Query Parameters
- **key** (string) - Required - Tag key.
- **value** (string) - Required - Tag value.

### Result
- **total** (integer) - Total number of results (always 1).
- **url** (string) - URL of the request.
- **data_until** (string) - All changes in the source until this date are reflected in this taginfo result.
- **data** (hash) - Hash with data:
  - **key** (string) - The tag key that was requested.
  - **value** (string) - The tag value that was requested.
  - **projects** (integer) - Number of projects mentioning this tag.
  - **wiki_pages** (array of hashes) - Language codes for which wiki pages about this tag are available. Each hash contains:
    - **lang** (string) - Language code.
    - **english** (string) - English name of this language.
    - **native** (string) - Native name of this language.
    - **dir** (string) - Printing direction for native name ("ltr", "rtl", or "auto").
  - **has_map** (boolean) - Is a map with the geographical distribution of this tag available?
  - **counts** (array of hashes) - Objects counts. Each hash contains:
    - **type** (string) - Object type ("all", "nodes", "ways", or "relations").
    - **count** (integer) - Number of objects with this type and tag.
    - **count_fraction** (float) - Number of objects in relation to all objects.
  - **description** (hash of hashes) - Description of this tag (hash key is language code). Each hash contains:
    - **text** (string) - Description text.
    - **dir** (string) - Printing direction for this language ("ltr", "rtl", or "auto").

### Request Example
`/api/4/tag/overview?key=amenity&value=restaurant`
```

--------------------------------

### /api/4/key/overview

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Retrieves comprehensive data for a specified tag key, including counts, associated projects, and wiki page availability.

```APIDOC
## /api/4/key/overview

### Description
Show various data for given key.

### Method
GET

### Endpoint
`/api/4/key/overview`

### Parameters
#### Query Parameters
- **key** (string) - Required - Tag key.

### Result
- **total** (integer) - Total number of results (always 1).
- **url** (string) - URL of the request.
- **data_until** (string) - All changes in the source until this date are reflected in this taginfo result.
- **data** (hash) - Hash with data.
  - **key** (string) - The tag key that was requested.
  - **projects** (integer) - Number of projects mentioning this key.
  - **users** (integer) - Number of users last editing objects with this key.
  - **wiki_pages** (array of hashes) - Language codes for which wiki pages about this key are available.
    - **lang** (string) - Language code.
    - **english** (string) - English name of this language.
    - **native** (string) - Native name of this language.
    - **dir** (string) - Printing direction for native name ("ltr", "rtl", or "auto").
  - **has_map** (boolean) - Is a map with the geographical distribution of this key available?
  - **counts** (array of hashes) - Objects counts.
    - **type** (string) - Object type ("all", "nodes", "ways", or "relations").
    - **count** (integer) - Number of objects with this type and key.
    - **count_fraction** (float) - Number of objects in relation to all objects.
  - **values** (integer) - Number of different values for this key.
  - **description** (hash of hashes) - Description of this key (hash key is language code).
    - **text** (string) - Description text.
    - **dir** (string) - Printing direction for this language ("ltr", "rtl", or "auto").
  - **prevalent_values** (array of hashes) - Prevalent values ordered by count from most often used down.
    - **value** (string) - The tag value.
    - **count** (integer) - Number of objects with this tag value.
    - **fraction** (float) - Fraction of number of objects with this tag value compared to all objects.
```

--------------------------------

### /api/4/tag/chronology

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Get chronology of tag counts for a specific tag.

```APIDOC
## GET /api/4/tag/chronology

### Description
Get chronology of tag counts for a specific tag.

### Method
GET

### Endpoint
/api/4/tag/chronology

### Parameters
#### Query Parameters
- **key** (string) - Required - Tag key.
- **value** (string) - Required - Tag value.

### Request Example
```json
{
  "key": "highway",
  "value": "primary"
}
```

### Response
#### Success Response (200)
- **total** (integer) - Total number of results.
- **url** (string) - URL of the request.
- **data_until** (string) - All changes in the source until this date are reflected in this taginfo result.
- **data** (array of hashes) - Array with results.
  - **date** (text) - Date in format YYYY-MM-DD.
  - **nodes** (integer) - Difference of number of nodes with this tag relative to previous entry.
  - **ways** (integer) - Difference of number of ways with this tag relative to previous entry.
  - **relations** (integer) - Difference of number of relations with this tag relative to previous entry.

#### Response Example
```json
{
  "total": 100,
  "url": "/api/4/tag/chronology?key=highway&value=primary",
  "data_until": "2023-10-27T10:00:00Z",
  "data": [
    {
      "date": "2023-10-26",
      "nodes": 10,
      "ways": 5,
      "relations": 1
    },
    {
      "date": "2023-10-25",
      "nodes": -5,
      "ways": -2,
      "relations": 0
    }
  ]
}
```
```

--------------------------------

### /api/4/projects/all

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Retrieves a list of all projects known to Taginfo. Supports filtering by query and status, with options for paging and sorting.

```APIDOC
## GET /api/4/projects/all

### Description
Get list of all projects using OSM tags known to taginfo.

### Method
GET

### Endpoint
/api/4/projects/all

### Parameters
#### Query Parameters
- **query** (string) - Optional - Only show projects where name or description matches this query (substring match).
- **status** (string) - Optional - Only show projects with given status (default is "OK").

### Paging
Optional paging parameters are supported.

### Sort
Supports sorting by `name`, `unique_keys`, `unique_values`.

### Result
- **total** (INT) - Total number of results.
- **page** (INT) - Result page number (first has page number 1).
- **rp** (INT) - Results per page.
- **url** (STRING) - URL of the request.
- **data_until** (STRING) - All changes in the source until this date are reflected in this taginfo result.
- **data** (ARRAY OF HASHES) - Array with results.
  - **id** (STRING) - Project id
  - **name** (STRING) - Project name
  - **project_url** (STRING) - Project URL
  - **icon_url** (STRING) - Icon URL
  - **doc_url** (STRING) - Documentation URL
  - **description** (STRING) - Project description
  - **key_entries** (INT) - Key entries for this project
  - **tag_entries** (INT) - Tag entries for this project
  - **unique_keys** (INT) - Unique keys known to this project
  - **unique_tags** (INT) - Unique tags known to this project

### Request Example
```json
/api/4/projects/all?page=1&rp=10&sortname=name&sortorder=asc
```
```

--------------------------------

### /api/4/projects/keys

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Retrieves a list of all keys used by at least one project. Supports filtering by a query string and pagination.

```APIDOC
## GET /api/4/projects/keys

### Description
Get list of all keys used by at least one project.

### Method
GET

### Endpoint
`/api/4/projects/keys`

### Parameters
#### Query Parameters
- **query** (string) - Optional - Only show keys matching this query (substring match).
- **page** (integer) - Optional - Result page number (first has page number 1).
- **rp** (integer) - Optional - Results per page.
- **sortname** (string) - Optional - Sort by `key`, `projects`, `in_wiki`, `count_all`.
- **sortorder** (string) - Optional - Sort order (asc or desc).

### Response
#### Success Response (200)
- **total** (integer) - Total number of results.
- **page** (integer) - Result page number.
- **rp** (integer) - Results per page.
- **url** (string) - URL of the request.
- **data_until** (string) - All changes in the source until this date are reflected in this taginfo result.
- **data** (array of hashes) - Array with results.
  - **key** (string) - Key
  - **projects** (integer) - Number of projects using this key
  - **in_wiki** (boolean) - Is there at least one wiki page for this key?
  - **count_all** (integer) - Number of objects in the OSM database with this key.
  - **count_all_fraction** (float) - Number of objects in relation to all objects.

### Request Example
`/api/4/projects/keys?page=1&rp=10&sortname=key&sortorder=asc`
```

--------------------------------

### /api/4/tags/popular

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Get a list of the most frequently used tags. This endpoint is useful for discovering commonly used tags and can be filtered by a query.

```APIDOC
## GET /api/4/tags/popular

### Description
Get list of most often used tags.

### Method
GET

### Endpoint
/api/4/tags/popular

### Parameters
#### Query Parameters
- **query** (string) - Optional - Only show tags matching this query (substring match in key and value, optional).

### Paging
Optional

### Sort
- **tag**
- **count_all**
- **count_nodes**
- **count_ways**
- **count_relations**

### Result
- **total** (INT) - Total number of results.
- **page** (INT) - Result page number (first has page number 1).
- **rp** (INT) - Results per page.
- **url** (STRING) - URL of the request.
- **data_until** (STRING) - All changes in the source until this date are reflected in this taginfo result.
- **data** (ARRAY OF HASHES) - Array with results.
  - **key** (STRING) - Key
  - **value** (STRING) - Value
  - **in_wiki** (BOOL) - In there at least one wiki page for this tag?
  - **count_all** (INT) - Number of objects in the OSM database with this tag.
  - **count_all_fraction** (FLOAT) - Number of objects in relation to all objects.
  - **count_nodes** (INT) - Number of nodes in the OSM database with this tag.
  - **count_nodes_fraction** (FLOAT) - Number of nodes in relation to all tagged nodes.
  - **count_ways** (INT) - Number of ways in the OSM database with this tag.
  - **count_ways_fraction** (FLOAT) - Number of ways in relation to all ways.
  - **count_relations** (INT) - Number of relations in the OSM database with this tag.
  - **count_relations_fraction** (FLOAT) - Number of relations in relation to all relations.
  - **projects** (INT) - Number of projects using this tag
```

--------------------------------

### /api/4/key/projects

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Retrieves a list of projects that utilize a specific tag key, with options for filtering and sorting.

```APIDOC
## /api/4/key/projects

### Description
Get projects using a given key.

### Method
GET

### Endpoint
`/api/4/key/projects`

### Parameters
#### Query Parameters
- **key** (string) - Required - Tag key.
- **query** (string) - Optional - Only show results where the project name or tag value matches this query (substring match).

#### Query Parameters (Filter)
- **filter** (string) - Optional - Filter by object type: `all`, `nodes`, `relations`, `ways`.

#### Query Parameters (Paging)
- **page** (integer) - Optional - Result page number (first has page number 1).
- **rp** (integer) - Optional - Results per page.

#### Query Parameters (Sort)
- **sortname** (string) - Optional - Sort by `project_name` or `tag`.
- **sortorder** (string) - Optional - Sort order: `asc` or `desc`.

### Result
- **total** (integer) - Total number of results.
- **page** (integer) - Result page number (first has page number 1).
- **rp** (integer) - Results per page.
- **url** (string) - URL of the request.
- **data_until** (string) - All changes in the source until this date are reflected in this taginfo result.
- **data** (array of hashes) - Array with results.
  - **project_id** (string) - Project ID.
  - **project_name** (string) - Project name.
  - **project_icon_url** (string) - Project icon URL.
  - **key** (string) - Key.
  - **value** (string) - Value.
  - **on_node** (boolean) - For nodes?
  - **on_way** (boolean) - For ways?
  - **on_relation** (boolean) - For relations?
  - **on_area** (boolean) - For areas?
  - **description** (string) - Description.
  - **doc_url** (string) - Documentation URL.
  - **icon_url** (string) - Icon URL.
```

--------------------------------

### /api/4/keys/all

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Retrieves a list of all keys available in the Taginfo database. This endpoint supports filtering and sorting to help narrow down the results.

```APIDOC
## /api/4/keys/all

### Description
Get list of all keys.

### Method
GET

### Endpoint
`/api/4/keys/all`

### Parameters
#### Query Parameters
- **query** (string) - Optional - Only show keys matching this query (substring match).

#### Filter Parameters
- **characters_colon** (boolean) - Category B: Only show keys like category A but with one ore more colons (:) inside.
- **characters_letters** (boolean) - Category C: Only show keys like category B but with uppercase latin letters or letters from other scripts.
- **characters_plain** (boolean) - Category A: Only show keys with latin lowercase letters (a to z) or underscore (_), first and last characters must be letters.
- **characters_problem** (boolean) - Category E: Only show keys with problematic characters.
- **characters_rest** (boolean) - Category F: Only show keys not fitting in category A through E.
- **characters_space** (boolean) - Category D: Only show keys with at least one whitespace character (space, tab, new line, carriage return, or from other scripts).
- **in_wiki** (boolean) - Only show keys that appear in the wiki.
- **not_in_db** (boolean) - Only show keys that do not appear in the database.

#### Sort Parameters
- **key** (string) - Sort by key name.
- **count_all** (string) - Sort by total count of objects.
- **count_nodes** (string) - Sort by count of nodes.
- **count_ways** (string) - Sort by count of ways.
- **count_relations** (string) - Sort by count of relations.
- **values_all** (string) - Sort by number of different values.
- **users_all** (string) - Sort by number of users.
- **in_wiki** (string) - Sort by wiki presence.
- **length** (string) - Sort by key length.

### Result
#### Success Response
- **total** (INT) - Total number of results.
- **page** (INT) - Result page number (first has page number 1).
- **rp** (INT) - Results per page.
- **url** (STRING) - URL of the request.
- **data_until** (STRING) - All changes in the source until this date are reflected in this taginfo result.
- **data** (ARRAY OF HASHES) - Array with results.
  - **key** (STRING) - Key
  - **count_all** (INT) - Number of objects in the OSM database with this key.
  - **count_all_fraction** (FLOAT) - Number of objects in relation to all objects.
  - **count_nodes** (INT) - Number of nodes in the OSM database with this key.
  - **count_nodes_fraction** (FLOAT) - Number of nodes in relation to all tagged nodes.
  - **count_ways** (INT) - Number of ways in the OSM database with this key.
  - **count_ways_fraction** (FLOAT) - Number of ways in relation to all ways.
  - **count_relations** (INT) - Number of relations in the OSM database with this key.
  - **count_relations_fraction** (FLOAT) - Number of relations in relation to all relations.
  - **values_all** (INT) - Number of different values for this key.
  - **users_all** (INT) - Number of users owning objects with this key.
  - **in_wiki** (BOOL) - Is there at least one wiki page for this key?
  - **projects** (INT) - Number of projects using this key

### Request Example
`/api/4/keys/all?page=1&rp=10&filter=in_wiki&sortname=key&sortorder=asc`
```

--------------------------------

### /api/4/tag/distribution/nodes

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Get a map image showing the distribution of a specific tag on nodes in the database. Returns an empty image if no map is available.

```APIDOC
## GET /api/4/tag/distribution/nodes

### Description
Get map with distribution of this tag in the database (nodes only). Will return empty image if there is no map available for this tag.

### Method
GET

### Endpoint
`/api/4/tag/distribution/nodes`

### Parameters
#### Query Parameters
- **key** (string) - Required - Tag key.
- **value** (string) - Required - Tag value.

### Result
PNG image representing the tag distribution on nodes.
```

--------------------------------

### /api/4/keys/similar

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Fetches a list of similar key pairs, where one key is used frequently and the other rarely. Supports JSON format, optional query filtering, paging, and sorting.

```APIDOC
## /api/4/keys/similar

### Description
Get list of pairs of similar keys, one used very often, one used rarely.

### Method
GET

### Endpoint
`/api/4/keys/similar`

### Parameters
#### Query Parameters
- **query** (string) - Optional - Only show keys matching this query (substring match).
- **page** (INT) - Optional - Result page number (first has page number 1).
- **rp** (INT) - Optional - Results per page.
- **sortname** (string) - Optional - Field to sort by. Allowed values: `key_common`, `key_rare`, `count_all_common`, `count_all_rare`, `similarity`.
- **sortorder** (string) - Optional - Order of sorting. Allowed values: `asc`, `desc`.

### Result
- **total** (INT) - Total number of results.
- **page** (INT) - Result page number (first has page number 1).
- **rp** (INT) - Results per page.
- **url** (STRING) - URL of the request.
- **data_until** (STRING) - All changes in the source until this date are reflected in this taginfo result.
- **data** (ARRAY OF HASHES) - Array with results.
  - **key_common** (STRING) - Key thats used often in OSM database
  - **count_all_common** (INT) - Number of objects in the OSM database with the common key.
  - **key_rare** (STRING) - Key thats used rarely in OSM database
  - **count_all_rare** (INT) - Number of objects in the OSM database with the rare key.
  - **similarity** (INT) - An integer measuring the similarity of the two keys, smaller is more similar.

### Request Example
```json
{
  "example": "/api/4/keys/similar?page=1&rp=10&sortname=count_all_common&sortorder=desc"
}
```
```

--------------------------------

### /api/4/key/values

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Get values used with a given key. Supports JSON and CSV formats, with optional language, query filtering, and sorting.

```APIDOC
## /api/4/key/values

### Description
Get values used with a given key.

### Method
GET

### Endpoint
`/api/4/key/values`

### Parameters
#### Query Parameters
- **key** (string) - Required - Tag key.
- **lang** (string) - Optional - Language for description (default: 'en').
- **query** (string) - Optional - Only show results where the value matches this query (substring match).

### Paging
Optional. Parameters like `page` and `rp` can be used.

### Filter
Supports filtering by `all`, `nodes`, `relations`, or `ways`.

### Sort
Supports sorting by `value`, `count_all`, `count_nodes`, `count_ways`, `count_relations`, or `in_wiki`.

### Result
- **total** (integer) - Total number of results.
- **page** (integer) - Result page number.
- **rp** (integer) - Results per page.
- **url** (string) - URL of the request.
- **data_until** (string) - All changes in the source until this date are reflected in this taginfo result.
- **data** (array of hashes) - Array with results.
  - **value** (string) - Value.
  - **count** (integer) - Number of times this key/value is in the OSM database.
  - **fraction** (float) - Number of times in relation to number of times this key is in the OSM database.
  - **in_wiki** (boolean) - Is there at least one wiki page for this tag?
  - **description** (string) - Description of the tag from the wiki.
  - **desclang** (string) - Language the description of the tag is in.
  - **descdir** (string) - Writing direction ("ltr", "rtl", or "auto") of description of the tag.

### Request Example
`/api/4/key/values?key=highway&page=1&rp=10&sortname=count_ways&sortorder=desc`
```

--------------------------------

### /api/4/key/distribution/ways

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Generates a PNG image visualizing the geographical distribution of a specific tag key across ways in the OpenStreetMap database.

```APIDOC
## GET /api/4/key/distribution/ways

### Description
Get map with distribution of this key in the database (ways only).

### Method
GET

### Endpoint
`/api/4/key/distribution/ways`

### Parameters
#### Query Parameters
- **key** (string) - Required - Tag key.

### Result
- PNG image.

### Example
`/api/4/key/distribution/ways?key=highway`
```

--------------------------------

### /api/4/wiki/key_status

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Lists all keys documented on the wiki along with their status. An optional status filter can be applied. Supports optional paging.

```APIDOC
## GET /api/4/wiki/key_status

### Description
List all keys documented on the wiki with their status.

### Method
GET

### Endpoint
/api/4/wiki/key_status

### Parameters
#### Query Parameters
- **status** (string) - Optional - Only show keys with this status.
- **page** (integer) - Optional - Result page number (first has page number 1).
- **rp** (integer) - Optional - Results per page.

### Response
#### Success Response (200)
- **total** (integer) - Total number of results.
- **page** (integer) - Result page number.
- **rp** (integer) - Results per page.
- **url** (string) - URL of the request.
- **data_until** (string) - All changes in the source until this date are reflected in this taginfo result.
- **data** (array of hashes) - Array with results, where each hash contains:
  - **status** (string) - Status.
  - **key** (string) - Key.
  - **langs** (array of strings) - List of languages that have this status and key.

### Request Example
```json
{
  "example": "/api/4/wiki/key_status?status=obsolete"
}
```
```

--------------------------------

### /api/4/keys/wiki_pages

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Retrieves a list of wiki pages in various languages for all keys. Supports JSON format, optional query filtering, paging, and sorting by key.

```APIDOC
## /api/4/keys/wiki_pages

### Description
Get list of wiki pages in different languages for all keys.

### Method
GET

### Endpoint
`/api/4/keys/wiki_pages`

### Parameters
#### Query Parameters
- **query** (string) - Optional - Only show keys matching this query (substring match).
- **page** (INT) - Optional - Result page number (first has page number 1).
- **rp** (INT) - Optional - Results per page.
- **sortname** (string) - Optional - Field to sort by. Allowed values: `key`.
- **sortorder** (string) - Optional - Order of sorting. Allowed values: `asc`, `desc`.

### Result
- **total** (INT) - Total number of results.
- **page** (INT) - Result page number (first has page number 1).
- **rp** (INT) - Results per page.
- **url** (STRING) - URL of the request.
- **data_until** (STRING) - All changes in the source until this date are reflected in this taginfo result.
- **data** (ARRAY OF HASHES) - Array with results.
  - **key** (STRING) - Key
  - **lang** (HASH) - Hash with language codes as keys and values showing what type of wiki pages are available.

### Request Example
```json
{
  "example": "/api/4/keys/wiki_pages?page=1&rp=10&sortname=key&sortorder=asc"
}
```
```

--------------------------------

### /api/4/project/tags

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Retrieves a list of all keys and tags used by a specific project. Supports JSON and CSV formats, with options for paging and sorting.

```APIDOC
## GET /api/4/project/tags

### Description
Get list of all keys/tags used by a project.

### Method
GET

### Endpoint
/api/4/project/tags

### Parameters
#### Query Parameters
- **project** (string) - Required - Project ID

### Paging
Optional paging parameters are supported.

### Sort
Supports sorting by `tag`, `count_all`, `in_wiki`.

### Result
- **total** (INT) - Total number of results.
- **page** (INT) - Result page number (first has page number 1).
- **rp** (INT) - Results per page.
- **url** (STRING) - URL of the request.
- **data_until** (STRING) - All changes in the source until this date are reflected in this taginfo result.
- **data** (ARRAY OF HASHES) - Array with results.
  - **key** (STRING) - Key
  - **value** (STRING) - Value
  - **on_node** (BOOL) - For nodes?
  - **on_way** (BOOL) - For ways?
  - **on_relation** (BOOL) - For relations?
  - **on_area** (BOOL) - For areas?
  - **description** (STRING) - Description
  - **doc_url** (STRING) - Documentation URL
  - **icon_url** (STRING) - Icon URL
  - **count_all** (INTEGER) - Number of objects with this key/tag in database
  - **in_wiki** (BOOL) - Is there at least one wiki page for this key/tag?

### Request Example
```json
/api/4/project/tags?project=id_editor&page=1&rp=10&sortname=tag&sortorder=asc
```
```

--------------------------------

### /api/4/project/icon

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Retrieves the icon for a given project. Requires a project ID.

```APIDOC
## GET /api/4/project/icon

### Description
Get icon of a project.

### Method
GET

### Endpoint
/api/4/project/icon

### Parameters
#### Query Parameters
- **project** (string) - Required - Project ID

### Result
Image in some format.

### Request Example
```json
/api/4/project/icon?project=id_editor
```
```

--------------------------------

### /api/4/key/wiki_pages

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Retrieves a list of wiki pages in various languages that describe a specific tag key. This endpoint is useful for understanding the context and usage of a particular key.

```APIDOC
## /api/4/key/wiki_pages

### Description
Get list of wiki pages in different languages describing a key.

### Method
GET

### Endpoint
`/api/4/key/wiki_pages`

### Parameters
#### Query Parameters
- **key** (string) - Required - Tag key

### Result
#### Success Response
- **total** (INT) - Total number of results.
- **url** (STRING) - URL of the request.
- **data_until** (STRING) - All changes in the source until this date are reflected in this taginfo result.
- **data** (ARRAY OF HASHES) - Array with results.
  - **lang** (STRING) - Language code.
  - **dir** (STRING) - Writing direction ("ltr", "rtl", or "auto") of description.
  - **language** (STRING) - Language name in its language.
  - **language_en** (STRING) - Language name in English.
  - **title** (STRING) - Wiki page title.
  - **description** (STRING) - Short description of key from wiki page.
  - **image** (HASH) - Associated image.
    - **title** (STRING) - Wiki page title of associated image.
    - **width** (INT) - Width of image.
    - **height** (INT) - Height of image.
    - **mime** (STRING) - MIME type of image.
    - **image_url** (STRING) - Image URL
  - **thumb_url_prefix** (STRING) - Prefix of thumbnail URL.
  - **thumb_url_suffix** (STRING) - Suffix of thumbnail URL.
  - **on_node** (BOOL) - Is this a key for nodes?
  - **on_way** (BOOL) - Is this a key for ways?
  - **on_area** (BOOL) - Is this a key for areas?
  - **on_relation** (BOOL) - Is this a key for relations?
  - **tags_implies** (ARRAY OF STRINGS) - List of keys/tags implied by this key.
  - **tags_combination** (ARRAY OF STRINGS) - List of keys/tags that can be combined with this key.
  - **tags_linked** (ARRAY OF STRINGS) - List of keys/tags related to this key.
  - **status** (STRING) - Status of this key/tag.

### Request Example
`/api/4/key/wiki_pages?key=highway`

### Notes
To get the complete thumbnail image URL, concatenate `thumb_url_prefix`, width of image in pixels, and `thumb_url_suffix`. The thumbnail image width must be smaller than `width`, use the `image_url` otherwise.
```

--------------------------------

### /api/4/wiki/inconsistent_key_status

Source: https://taginfo.openstreetmap.org/taginfo/apidoc

Lists all keys documented on the wiki that have differing statuses across different languages. Supports optional paging.

```APIDOC
## GET /api/4/wiki/inconsistent_key_status

### Description
List all keys documented on the wiki which have a different status in different languages.

### Method
GET

### Endpoint
/api/4/wiki/inconsistent_key_status

### Parameters
#### Query Parameters
- **page** (integer) - Optional - Result page number (first has page number 1).
- **rp** (integer) - Optional - Results per page.

### Response
#### Success Response (200)
- **total** (integer) - Total number of results.
- **page** (integer) - Result page number.
- **rp** (integer) - Results per page.
- **url** (string) - URL of the request.
- **data_until** (string) - All changes in the source until this date are reflected in this taginfo result.
- **data** (array of hashes) - Array with results, where each hash contains:
  - **key** (string) - Key.
  - **counts** (hash) - Hash mapping status values to counts of wiki pages.

### Request Example
```json
{
  "example": "/api/4/wiki/inconsistent_key_status"
}
```
```