### Install and run PouchDB Server

Source: https://github.com/apache/pouchdb/blob/master/docs/guides/setup-couchdb.md

Install PouchDB Server globally using npm and start it. This is an experimental alternative to CouchDB.

```bash
$ npm install -g pouchdb-server
$ pouchdb-server --port 5984
```

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

### Run Site Locally

Source: https://github.com/apache/pouchdb/blob/master/docs/WEBSITE_README.md

Install dependencies and build the site to run the development server locally. This command starts a server that watches for file changes.

```sh
$ npm i
$ npm run build-site
```

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

### Explain Index with Callback

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/explain_index.html

Example of using the explain index API with a traditional callback function. Ensure the pouchdb-find plugin is installed.

```javascript
db.explain({ selector: { name: 'Mario', series: "mario" }, fields: ['_id', 'name'], sort: ['name'] }, function (err, explanation) {
  if (err) {
    return console.log(err);
  }
  // view explanation
});
```

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

### Check PouchDB setup with `info()`

Source: https://github.com/apache/pouchdb/blob/master/docs/posts/2016-09-05-pouchdb-6.0.0.md

The constructor is now stateless. Use `db.info()` to test if setup can complete.

```javascript
new PouchDB(dbName).info()
```

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

### Install Cordova Tool

Source: https://github.com/apache/pouchdb/blob/master/docs/posts/2016-04-28-prebuilt-databases-with-pouchdb.md

Installs the Cordova command-line interface globally.

```bash
$ npm install -g cordova
```

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

### Install pouchdb-adapter-idb

Source: https://github.com/apache/pouchdb/blob/master/packages/node_modules/pouchdb-adapter-idb/README.md

Install the pouchdb-adapter-idb package using npm.

```bash
npm install pouchdb-adapter-idb
```

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

### Install PouchDB HTTP Adapter

Source: https://github.com/apache/pouchdb/blob/master/packages/node_modules/pouchdb-adapter-http/README.md

Install the pouchdb-adapter-http package using npm.

```bash
npm install pouchdb-adapter-http
```

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

### Install pouchdb-mapreduce

Source: https://github.com/apache/pouchdb/blob/master/packages/node_modules/pouchdb-mapreduce/README.md

Install the pouchdb-mapreduce plugin using npm.

```bash
npm install --save pouchdb-mapreduce
```

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

### Get Database Information (Async/Await)

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/database_information.html

Use this method to retrieve metadata about the database. This example shows the async/await pattern.

```javascript
try {
  const result = await db.info();
} catch (err) {
  console.log(err);
}
```

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

### Install pouchdb-checkpointer

Source: https://github.com/apache/pouchdb/blob/master/docs/custom.md

Install pouchdb-checkpointer, a tool for writing checkpoints during replication. Use exact versions as it does not follow semver.

```bash
npm install --save-exact pouchdb-checkpointer
```

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

### Install PouchDB Replication Plugin

Source: https://github.com/apache/pouchdb/blob/master/packages/node_modules/pouchdb-replication/README.md

Install the pouchdb-replication package using npm. This is the first step before using the plugin.

```bash
npm install pouchdb-replication
```

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

### Install pouchdb-dump-cli

Source: https://github.com/apache/pouchdb/blob/master/docs/posts/2016-04-28-prebuilt-databases-with-pouchdb.md

Install the pouchdb-dump-cli globally to create plaintext dump files from PouchDB or CouchDB databases.

```bash
$ npm install -g pouchdb-dump-cli
```

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

### Install pouchdb-mapreduce-utils

Source: https://github.com/apache/pouchdb/blob/master/docs/custom.md

Install pouchdb-mapreduce-utils, containing utilities used by pouchdb-mapreduce. Use exact versions as it does not follow semver.

```bash
npm install --save-exact pouchdb-mapreduce-utils
```

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

### Install pouchdb-adapter-utils

Source: https://github.com/apache/pouchdb/blob/master/docs/custom.md

Install pouchdb-adapter-utils, a package containing utilities for PouchDB adapters. Use exact versions as it does not follow semver.

```bash
npm install --save-exact pouchdb-adapter-utils
```

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

### Install pouchdb-binary-utils

Source: https://github.com/apache/pouchdb/blob/master/docs/custom.md

Install pouchdb-binary-utils, a package for operating on binary strings and Buffers/Blobs. Use exact versions as it does not follow semver.

```bash
npm install --save-exact pouchdb-binary-utils
```

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

### Install pouchdb-fetch

Source: https://github.com/apache/pouchdb/blob/master/packages/node_modules/pouchdb-fetch/README.md

Install the pouchdb-fetch package using npm. Use --save-exact to ensure an exact version is installed, as this package does not follow semver.

```bash
npm install --save-exact pouchdb-fetch
```

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

### Install PouchDB Memory Adapter

Source: https://github.com/apache/pouchdb/blob/master/packages/node_modules/pouchdb-adapter-memory/README.md

Install the pouchdb-adapter-memory package using npm.

```bash
npm install pouchdb-adapter-memory
```

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

### Install pouchdb-selector-core

Source: https://github.com/apache/pouchdb/blob/master/docs/custom.md

Install the core Mango selector logic package. This is used by pouchdb-find and for filtering/replication.

```bash
npm install --save-exact pouchdb-selector-core
```

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

### Install CouchDB on Debian/Ubuntu

Source: https://github.com/apache/pouchdb/blob/master/docs/guides/setup-couchdb.md

Update package lists and install CouchDB after enabling the repository.

```bash
$ sudo apt-get update
$ sudo apt-get install -y couchdb
```

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

### Install pouchdb-adapter-websql-core

Source: https://github.com/apache/pouchdb/blob/master/packages/node_modules/pouchdb-adapter-websql-core/README.md

Install this package using npm with an exact version to ensure compatibility, as it does not follow semantic versioning.

```bash
npm install --save-exact @craftzdog/pouchdb-adapter-websql-core
```

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

### Install pouchdb-adapter-leveldb-core

Source: https://github.com/apache/pouchdb/blob/master/packages/node_modules/pouchdb-adapter-leveldb-core/README.md

Install the package using npm. Use --save-exact to ensure precise versioning as this package does not follow semver.

```bash
npm install --save-exact pouchdb-adapter-leveldb-core
```

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

### Install PouchDB and SQLite Adapter

Source: https://github.com/apache/pouchdb/blob/master/docs/posts/2016-04-28-prebuilt-databases-with-pouchdb.md

Installs the necessary PouchDB package and the pouchdb-adapter-node-websql plugin using npm.

```bash
$ npm install pouchdb
$ npm install pouchdb-adapter-node-websql
```

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

### Install PouchDB IndexedDB Adapter

Source: https://github.com/apache/pouchdb/blob/master/packages/node_modules/pouchdb-adapter-indexeddb/README.md

Install the IndexedDB adapter using npm. This is the first step to using IndexedDB with PouchDB.

```bash
npm install pouchdb-adapter-indexeddb
```

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

### Install pouchdb-md5

Source: https://github.com/apache/pouchdb/blob/master/docs/custom.md

Install pouchdb-md5, which provides utilities for calculating MD5 checksums. Use exact versions as it does not follow semver.

```bash
npm install --save-exact pouchdb-md5
```

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

### Install and Use pouchdb-mapreduce Plugin

Source: https://github.com/apache/pouchdb/blob/master/docs/custom.md

Install the pouchdb-mapreduce plugin to enable the map/reduce API. Plugin it into PouchDB to use methods like `query()`.

```bash
npm install pouchdb-mapreduce
```

```javascript
PouchDB.plugin(require('pouchdb-mapreduce'));
const db = new PouchDB('mydb');
db.query(/* see query API docs for full info */);
```

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

### Start PouchDB Server with SQLite Adapter

Source: https://github.com/apache/pouchdb/blob/master/docs/posts/2016-04-28-prebuilt-databases-with-pouchdb.md

Starts the PouchDB server with the SQLite adapter enabled, automatically creating SQLite database files.

```bash
$ pouchdb-server --sqlite
```

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

### Install and Use IndexedDB Adapter

Source: https://github.com/apache/pouchdb/blob/master/docs/custom.md

Install the IndexedDB adapter and configure PouchDB to use it. This is the primary adapter for browsers.

```bash
npm install pouchdb-adapter-idb
```

```javascript
PouchDB.plugin(require('pouchdb-adapter-idb'));
const db = new PouchDB('mydb', {adapter: 'idb'});
console.log(db.adapter); // 'idb'
```

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

### Install and Use Experimental IndexedDB Adapter

Source: https://github.com/apache/pouchdb/blob/master/docs/custom.md

Install the experimental next-generation IndexedDB adapter ('idb-next'). This is not yet part of the main PouchDB distribution.

```bash
npm install pouchdb-adapter-indexeddb
```

```javascript
PouchDB.plugin(require('pouchdb-adapter-indexeddb'));
const db = new PouchDB('mydb', {adapter: 'indexeddb'});
console.log(db.adapter); // 'indexeddb'
```

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

### Download and Run Live Example

Source: https://github.com/apache/pouchdb/blob/master/docs/guides/databases.md

Commands to clone a PouchDB live example from GitHub and serve it locally using Python's HTTP server.

```bash
git clone https://gist.github.com/bddac54b92c2d8d39241.git kittens
cd kittens
python -m SimpleHTTPServer # for Python 2
python -m http.server      # for Python 3
```

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

### Create and Get a Local Document

Source: https://github.com/apache/pouchdb/blob/master/docs/guides/local-documents.md

Use `'_local/'` as the prefix for the `_id` to create a local document. You can then fetch it using `get()`.

```javascript
db.put({
  _id: '_local/foobar',
  someText: 'yo, this is my local doc!'
}).then(function () {
  return db.get('_local/foobar');
});
```

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

### Bulk Get Example Response Structure

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/bulk_get.html

This is an example of the JSON response structure returned by the bulkGet API. It shows successful document retrieval and error objects for missing documents or revisions.

```json
{
  "results": [
    {
      "docs": [
        {
          "ok": {
            "_id": "doc-that-exists",
            "_rev": "1-967a00dff5e02add41819138abb3284d",
            "_revisions": {
              "ids": [
                "967a00dff5e02add41819138abb3284d"
              ],
              "start": 1
            }
          }
        }
      ],
      "id": "doc-that-exists"
    },
    {
      "docs": [
        {
          "error": {
            "error": "not_found",
            "id": "doc-that-does-not-exist",
            "reason": "missing",
            "rev": "undefined"
          }
        }
      ],
      "id": "doc-that-does-not-exist"
    },
    {
      "docs": [
        {
          "error": {
            "error": "not_found",
            "id": "doc-that-exists",
            "reason": "missing",
            "rev": "1-badrev"
          }
        }
      ],
      "id": "doc-that-exists"
    }
  ]
}
```

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

### Install pouchdb-ajax

Source: https://github.com/apache/pouchdb/blob/master/docs/custom.md

Install pouchdb-ajax, which exposes PouchDB's ajax() function. Use exact versions as it does not follow semver.

```bash
npm install --save-exact pouchdb-ajax
```

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

### Build and Serve PouchDB Website Locally

Source: https://github.com/apache/pouchdb/blob/master/CONTRIBUTING.md

Build the PouchDB website and start the development server.

```bash
npm run build-site
```

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

### In-memory PouchDB

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/create_database.html

Example of creating an in-memory PouchDB database, which requires installing the 'pouchdb-adapter-memory' plugin.

```APIDOC
## Create In-Memory Database

### Description
Creates an in-memory PouchDB database. This is useful for testing or temporary data storage.

### Method
Constructor

### Endpoint
N/A (JavaScript API)

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
None

### Request Example
```javascript
// Ensure 'pouchdb-adapter-memory' is installed first
const db = new PouchDB('dbname', {adapter: 'memory'});
```

### Options
* `adapter`: Set to `'memory'` to use the in-memory adapter.

### Response
#### Success Response (200)
Returns an in-memory PouchDB database instance.

#### Response Example
```javascript
const db = new PouchDB('myTempDb', {adapter: 'memory'});
```
```

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

### Install and Use LocalStorage Adapter

Source: https://github.com/apache/pouchdb/blob/master/docs/custom.md

Install the LocalStorage adapter for browser usage. This adapter stores data in the browser's LocalStorage.

```bash
npm install pouchdb-adapter-localstorage
```

```javascript
PouchDB.plugin(require('pouchdb-adapter-localstorage'));
const db = new PouchDB('mydb', {adapter: 'localstorage'});
console.log(db.adapter); // 'localstorage'
```

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

### Get Attachment (Promise)

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/get_attachment.html

Example of retrieving an attachment using Promises. This method is useful for chaining asynchronous operations.

```javascript
db.getAttachment('doc', 'att.txt').then(function (blobOrBuffer) {
  // handle result
}).catch(function (err) {
  console.log(err);
});
```

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

### Get Database Information (Promise)

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/database_information.html

Use this method to retrieve metadata about the database. This example shows the promise pattern.

```javascript
db.info().then(function (result) {
  // handle result
}).catch(function (err) {
  console.log(err);
});
```

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

### Example Usage of Default PouchDB Constructors

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/defaults.html

Demonstrates creating PouchDB instances with default configurations like in-memory adapter, prefix for database names, and HTTP endpoints. Default options can be overridden when creating new instances.

```javascript
const MyMemPouch = PouchDB.defaults({ adapter: 'memory' });
// In-memory PouchDB
const myMemPouch = new MyMemPouch('dbname');
```

```javascript
const MyPrefixedPouch = PouchDB.defaults({ prefix: '/path/to/my/db/' });
// db will be named '/path/to/my/db/dbname', useful for LevelDB
const myPrefixedPouch = new MyPrefixedPouch('dbname');
```

```javascript
const HTTPPouch = PouchDB.defaults({ prefix: 'http://example.org' });
// db will be located at 'http://example.org/dbname'
const myHttpPouch = new HTTPPouch('dbname');
```

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

### Install and Use WebSQL Adapter

Source: https://github.com/apache/pouchdb/blob/master/docs/custom.md

Install the WebSQL adapter and configure PouchDB. This adapter was previously shipped by default but now requires explicit loading.

```bash
npm install pouchdb-adapter-websql
```

```javascript
PouchDB.plugin(require('pouchdb-adapter-websql'));
const db = new PouchDB('mydb', {adapter: 'websql'});
console.log(db.adapter); // 'websql'
```

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

### Get Database Information (Callback)

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/database_information.html

Use this method to retrieve metadata about the database. This example shows the callback pattern.

```javascript
db.info(function(err, info) {
  if (err) {
    return console.log(err);
  }
  // handle result
});
```

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

### Serve Project Locally

Source: https://github.com/apache/pouchdb/blob/master/docs/getting-started.md

Run a simple HTTP server to serve your project files. This is useful for avoiding filesystem access restrictions in browsers.

```bash
$ cd pouchdb-getting-started-todo
$ python -m SimpleHTTPServer  # for Python 2
$ python -m http.server       # for Python 3
```

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

### Get Attachment (Async/Await)

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/get_attachment.html

Example of retrieving an attachment using async/await syntax. This is a modern approach for handling asynchronous operations.

```javascript
try {
  const blobOrBuffer = await db.getAttachment('doc', 'att.txt');
} catch (err) {
  console.log(err);
}
```

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

### Create Index with Options (Async/Await)

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/create_index.html

Example of creating an index with additional options using async/await. Requires the pouchdb-find plugin.

```javascript
try {
  const result = await db.createIndex({ index: { fields: ['foo', 'bar'], name: 'myindex', ddoc: 'mydesigndoc', type: 'json' } });
} catch (err) {
  console.log(err);
}
```

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

### Run Site with Hot Reloading

Source: https://github.com/apache/pouchdb/blob/master/docs/WEBSITE_README.md

Build the site with the --serve flag for full hot reloading. Note that this may not catch all style changes.

```sh
$ npm run build11 -- --serve
```

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

### Get Attachment (Callback)

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/get_attachment.html

Example of retrieving an attachment using a callback function. Ensure the document and attachment IDs are correct.

```javascript
db.getAttachment('doc', 'att.txt', function(err, blobOrBuffer) {
  if (err) {
    return console.log(err);
  }
  // handle result
});
```

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

### Changes API - Live Updates

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/changes.html

This example shows how to set up the changes() API for live updates, emitting events for each change.

```APIDOC
## changes() - Live Updates

### Description
Listens for changes in the database in real-time. When `live: true` is set, the `changes()` method returns an event emitter that fires events for each new change.

### Method
`db.changes({ live: true, ...options })`

### Event Emitters
- **'change'** (`info`): Fires for each change. If `include_docs` is true, `info.doc` will contain the document.
- **'complete'** (`info`): Fires when all changes have been read. In live changes, this typically only fires if the feed is cancelled.
- **'error'** (`err`): Fires when the changes feed stops due to an unrecoverable failure.

### Parameters
#### Query Parameters
- **live** (boolean) - Required - Set to `true` to enable live updates.
- **include_docs** (boolean) - Optional - If `true`, the full document will be included in the change event.
- **since** (number | string) - Optional - The sequence number to start retrieving changes from. Use `'now'` to start from the current point in time.

### Request Example
```javascript
const changes = db.changes({
  live: true,
  include_docs: true,
  since: 'now'
});

changes.on('change', function (info) {
  console.log('Change:', info);
  // info.doc will contain the doc if include_docs is true
});

changes.on('complete', function (info) {
  console.log('Changes feed complete:', info);
});

changes.on('error', function (err) {
  console.log('Error in changes feed:', err);
});

// To stop listening:
// changes.cancel();
```

### Response Examples
#### Example response in the `'change'` listener (using `{include_docs: true}`):
```json
{
  "id": "doc1",
  "changes": [
    {
      "rev": "1-9152679630cc461b9477792d93b83eae"
    }
  ],
  "doc": {
    "_id": "doc1",
    "_rev": "1-9152679630cc461b9477792d93b83eae"
  },
  "seq": 1
}
```

#### Example response in the `'change'` listener when a doc was deleted:
```json
{
  "id": "doc2",
  "changes": [
    {
      "rev": "2-9b50a4b63008378e8d0718a9ad05c7af"
    }
  ],
  "doc": {
    "_id": "doc2",
    "_rev": "2-9b50a4b63008378e8d0718a9ad05c7af",
    "_deleted": true
  },
  "deleted": true,
  "seq": 3
}
```

#### Example response in the `'complete'` listener:
```json
{
  "results": [
    {
      "id": "doc1",
      "changes": [
        {
          "rev": "1-9152679630cc461b9477792d93b83eae"
        }
      ],
      "doc": {
        "_id": "doc1",
        "_rev": "1-9152679630cc461b9477792d93b83eae"
      },
      "seq": 1
    },
    {
      "id": "doc2",
      "changes": [
        {
          "rev": "2-9b50a4b63008378e8d0718a9ad05c7af"
        }
      ],
      "doc": {
        "_id": "doc2",
        "_rev": "2-9b50a4b63008378e8d0718a9ad05c7af",
        "_deleted": true
      },
      "deleted": true,
      "seq": 3
    }
  ],
  "last_seq": 3
}
```
```

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

### Fetching All Documents with Options

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/batch_fetch.html

Demonstrates fetching all documents with options like including document content and attachments, and specifying a range using startkey and endkey.

```APIDOC
## db.allDocs()

### Description
Fetches all documents in the database, with options to include document content, attachments, and specify a key range.

### Method
`db.allDocs(options, callback)`
`db.allDocs(options)` (Promise)
`await db.allDocs(options)` (Async/Await)

### Parameters
#### Options Object
- **include_docs** (boolean) - Optional - If true, includes the full document for each row.
- **attachments** (boolean) - Optional - If true, includes attachment data.
- **startkey** (string) - Optional - The key to start searching from.
- **endkey** (string) - Optional - The key to end searching at.

### Request Example (Promise)
```js
db.allDocs({
  include_docs: true,
  attachments: true,
  startkey: 'bar',
  endkey: 'quux'
}).then(function (result) {
  // handle result
}).catch(function (err) {
  console.log(err);
});
```

### Response
#### Success Response (200)
- **rows** (array) - An array of document objects.
  - **doc** (object) - The document object (if `include_docs` is true).
  - **id** (string) - The document ID.
  - **rev** (string) - The document revision.

#### Response Example
```json
{
  "rows": [
    {
      "id": "doc1",
      "key": "doc1",
      "value": {
        "rev": "1-abc"
      },
      "doc": {
        "_id": "doc1",
        "_rev": "1-abc",
        "data": "some data"
      }
    }
  ]
}
```
```

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

### Clone PouchDB Repository and Install Dependencies

Source: https://github.com/apache/pouchdb/blob/master/README.md

Follow these steps to build PouchDB from source. This is useful for developers who want to use prerelease builds or contribute to the project.

```bash
git clone https://github.com/pouchdb/pouchdb.git
cd pouchdb
npm install
```

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

### PouchDB Bulk Get with Async/Await

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/bulk_get.html

This example demonstrates fetching multiple documents using the async/await syntax for cleaner asynchronous code. It includes error handling with a try-catch block.

```javascript
try {
  const result = await db.bulkGet({
    docs: [
      { id: "doc-that-exists", rev: "1-967a00dff5e02add41819138abb3284d"},
      { id: "doc-that-does-not-exist", rev: "1-3a24009a9525bde9e4bfa8a99046b00d"},
      { id: "doc-that-exists", rev: "1-bad_rev"}
    ]
  });
} catch (err) {
  console.log(err);
}
```

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

### Querying with a Map Function (Range and Limit)

Source: https://github.com/apache/pouchdb/blob/master/docs/guides/queries.md

Example of using `pouch.query()` with `startkey`, `endkey`, and `limit` to find a range of documents, such as the first 5 Pokemon whose names start with 'P'.

```javascript
// find the first 5 pokemon whose name starts with 'P'
pouch.query(myMapFunction, {
  startkey     : 'P',
  endkey       : 'P\ufff0',
  limit        : 5,
  include_docs : true
}).then(function (result) {
  // handle result
}).catch(function (err) {
  // handle errors
});

```

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

### Include PouchDB via CDN

Source: https://github.com/apache/pouchdb/blob/master/docs/download.md

Use this snippet to include the PouchDB library directly in your HTML using a CDN link. This is a quick way to get started without a build process.

```html
<script src="https://cdn.jsdelivr.net/npm/pouchdb@{{site.version}}/dist/pouchdb.min.js"></script>
<script>
  const db = new PouchDB('my_database');
</script>
```

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

### Run development server with find plugin

Source: https://github.com/apache/pouchdb/blob/master/TESTING.md

Start the development server, including the 'pouchdb-find' plugin, to test PouchDB in the browser. This is necessary for 'find' tests to pass.

```bash
$ PLUGINS=pouchdb-find npm run dev
```

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

### Install PouchDB Browser for faster installs

Source: https://github.com/apache/pouchdb/blob/master/docs/download.md

If PouchDB is only used in the browser, install `pouchdb-browser` for potentially faster installation times. This package is optimized for browser environments.

```bash
npm install --save pouchdb-browser
```

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

### Example Response

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/delete_index.html

This is an example of a successful response when deleting an index.

```json
{ "ok": true }
```

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

### Start Live Replication with Event Handlers

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/replication.html

Initiates a live replication between two databases and sets up event listeners for changes, pauses, active states, denials, completion, and errors. Call `rep.cancel()` to stop the replication.

```javascript
const rep = PouchDB.replicate('mydb', 'http://localhost:5984/mydb', { live: true, retry: true }).on('change', function (info) {
  // handle change
}).on('paused', function (err) {
  // replication paused (e.g. replication up to date, user went offline)
}).on('active', function () {
  // replicate resumed (e.g. new changes replicating, user went back online)
}).on('denied', function (err) {
  // a document failed to replicate (e.g. due to permissions)
}).on('complete', function (info) {
  // handle complete
}).on('error', function (err) {
  // handle error
});

rep.cancel(); // whenever you want to cancel
```

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

### Install and Use pouchdb-replication Plugin

Source: https://github.com/apache/pouchdb/blob/master/docs/custom.md

Install the pouchdb-replication plugin to enable replication and sync functionalities. Plugin it into PouchDB to use methods like `replicate()` and `sync()`.

```bash
npm install pouchdb-replication
```

```javascript
PouchDB.plugin(require('pouchdb-replication'));
const db = new PouchDB('mydb');
db.replicate(/* see replicate/sync API docs for full info */);
```

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

### Install pouchdb-utils

Source: https://github.com/apache/pouchdb/blob/master/docs/custom.md

Install the miscellaneous utilities package used by PouchDB and its sub-packages.

```bash
npm install --save-exact pouchdb-utils
```

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

### Querying with Async/Await and Joining Documents

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/query_database.html

This async/await example demonstrates joining artist data to albums. It uses a try-catch block for error handling.

```javascript
function map(doc) {
  // join artist data to albums
  if (doc.type === 'album') {
    emit(doc.name, {"_id" : doc.artistId, albumYear : doc.year});
  }
}
try {
  const result = await db.query(map, {include_docs : true});
} catch (err) {
  console.log(err);
}
```

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

### Smart Pagination Method with Startkey

Source: https://github.com/apache/pouchdb/blob/master/docs/posts/2014-04-14-pagination-strategies-with-pouchdb.md

Use this method for efficient pagination. It leverages the 'startkey' option to specify the beginning of the next page, avoiding performance issues associated with large skips.

```javascript
var options = {limit : 5};
function fetchNextPage() {
  pouch.allDocs(options, function (err, response) {
    if (response && response.rows.length > 0) {
      options.startkey = response.rows[response.rows.length - 1].id;
      options.skip = 1;
    }
    // handle err or response
  });
}
```

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

### Compaction Response Example

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/compaction.html

An example of the response object returned after a successful compaction operation.

```json
{
  "ok" : "true"
}
```

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

### Handle Change Events

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/changes.html

Example of setting up listeners for 'change', 'complete', and 'error' events when monitoring database changes. Remember to call `cancel()` when you no longer need to listen.

```javascript
const changes = db.changes({
  since: 'now',
  live: true,
  include_docs: true
}).on('change', function(change) {
  // handle change
}).on('complete', function(info) {
  // changes() was canceled
}).on('error', function (err) {
  console.log(err);
});

changes.cancel(); // whenever you want to cancel
```

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

### PouchDB Installation Errors on Windows (Python)

Source: https://github.com/apache/pouchdb/blob/master/docs/errors.md

When `npm install pouchdb` fails on Windows due to missing Python, ensure Python 2.7 is installed and accessible, or consider using `pouchdb-browser` for browser-only applications.

```bash
C:\XXX\node_modules\project_name>if not defined npm_config_node_gyp (node "C:\XXX\node_modules\npm\bin\node-gyp-bin\....\node_modules\node-gyp\bin\node-gyp.js" rebuild ) else (node "" rebuild )
gyp ERR! configure error
gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable.
gyp ERR! stack at PythonFinder.failNoPython (C:\XXX\nodejs\node_modules\npm\node_modules\node-gyp\lib\configure.js:483:19)
```

```bash
gyp ERR! configure error
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! leveldown@3.0.0 install: `prebuild-install || node-gyp rebuild`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the leveldown@3.0.0 install script.
```

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

### CouchDB welcome response

Source: https://github.com/apache/pouchdb/blob/master/docs/guides/setup-couchdb.md

Example of the expected JSON response when verifying CouchDB is running.

```json
{"couchdb":"Welcome","version":"2.2.0",...}
```

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

### Install PouchDB with npm

Source: https://github.com/apache/pouchdb/blob/master/docs/guides/setup-pouchdb.md

Install PouchDB using npm and include the JavaScript file in your HTML.

```bash
$ npm install pouchdb
```

```html
<script src="node_modules/pouchdb/dist/pouchdb.min.js"></script>
```

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

### Initialize PouchDB with IndexedDB Adapter

Source: https://github.com/apache/pouchdb/blob/master/packages/node_modules/pouchdb-adapter-indexeddb/README.md

Plugin the IndexedDB adapter into PouchDB and create a new database instance. Specify 'indexeddb' as the adapter.

```javascript
PouchDB.plugin(require('pouchdb-adapter-indexeddb'));
var db = new PouchDB('mydb', {adapter: 'indexeddb'});
```

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

### Install PouchDB with Bower

Source: https://github.com/apache/pouchdb/blob/master/docs/guides/setup-pouchdb.md

Install PouchDB using Bower and include the JavaScript file in your HTML.

```bash
$ bower install pouchdb
```

```html
<script src="bower_components/pouchdb/dist/pouchdb.min.js"></script>
```

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

### Explain Index with Async/Await

Source: https://github.com/apache/pouchdb/blob/master/docs/_includes/api/explain_index.html

Example of using the explain index API with async/await syntax for cleaner asynchronous code. The pouchdb-find plugin is required.

```javascript
try {
  const explanation = await db.explain({
    selector: { name: 'Mario', series: "mario" },
    fields: ['_id', 'name'],
    sort: ['name']
  });
} catch (err) {
  console.log(err);
}
```

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

### Install PouchDB

Source: https://github.com/apache/pouchdb/blob/master/packages/node_modules/pouchdb/README.md

Install the PouchDB package using npm. This is the first step to using PouchDB in your project.

```bash
npm install pouchdb
```

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

### Synchronous LocalStorage Example

Source: https://github.com/apache/pouchdb/blob/master/docs/posts/2015-03-05-taming-the-async-beast-with-es7.md

Demonstrates the simple, synchronous API of LocalStorage for data persistence.

```javascript
if (!localStorage.foo) {
  localStorage.foo = 'bar';
};
console.log(localStorage.foo);
```

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

### Install Cordova Plugins

Source: https://github.com/apache/pouchdb/blob/master/docs/posts/2016-04-28-prebuilt-databases-with-pouchdb.md

Install the File Plugin and SQLite Plugin 2 for Cordova app development.

```bash
$cordova plugin add cordova-plugin-file --save
$cordova plugin add cordova-plugin-sqlite-2 --save
```

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

### Basic Live Replication

Source: https://github.com/apache/pouchdb/blob/master/docs/guides/replication.md

Initiates a live replication between two databases. Listen for 'change' and 'error' events.

```javascript
localDB.sync(remoteDB, {
  live: true
}).on('change', function (change) {
  // yo, something changed!
}).on('error', function (err) {
  // yo, we got an error! (maybe the user went offline?)
});
```

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

### Install sublevel-pouchdb

Source: https://github.com/apache/pouchdb/blob/master/docs/custom.md

Install the sublevel-pouchdb package, a fork of level-sublevel containing only the subset of the API that PouchDB uses.

```bash
npm install --save-exact sublevel-pouchdb
```

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

### Install pouchdb-abstract-mapreduce

Source: https://github.com/apache/pouchdb/blob/master/docs/custom.md

Install pouchdb-abstract-mapreduce, which provides the underlying logic for secondary indexes used by pouchdb-mapreduce and pouchdb-find. Use exact versions as it does not follow semver.

```bash
npm install --save-exact pouchdb-abstract-mapreduce
```

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

### Install add-cors-to-couchdb

Source: https://github.com/apache/pouchdb/blob/master/docs/getting-started.md

Install the `add-cors-to-couchdb` tool globally to enable CORS for CouchDB. This is necessary for direct replication.

```bash
$ npm install -g add-cors-to-couchdb
$ add-cors-to-couchdb
```

```bash
$ add-cors-to-couchdb http://me.example.com -u myusername -p mypassword
```

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

### Initialize PouchDB Database

Source: https://github.com/apache/pouchdb/blob/master/docs/posts/2015-02-28-efficiently-managing-ui-state-in-pouchdb.md

Instantiate a new PouchDB database. This is the first step before interacting with PouchDB.

```javascript
var db = new PouchDB('my_db');
```

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

### Install PouchDB Find via npm

Source: https://github.com/apache/pouchdb/blob/master/packages/node_modules/pouchdb-find/README.md

Install the PouchDB Find plugin using npm for Node.js projects.

```bash
npm install pouchdb-find
```

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

### Install PouchDB Find via Bower

Source: https://github.com/apache/pouchdb/blob/master/packages/node_modules/pouchdb-find/README.md

Install the PouchDB Find plugin using Bower for browser projects.

```bash
bower install pouchdb-find
```

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

### Build PouchDB Locally

Source: https://github.com/apache/pouchdb/blob/master/CONTRIBUTING.md

Steps to build PouchDB from source after installing dependencies.

```bash
cd pouchdb
npm install
npm run build
```