### Install adhocore/php-json-fixer using Composer

Source: https://github.com/adhocore/php-json-fixer/blob/main/readme.md

This snippet shows how to install the json-fixer library using Composer, the dependency manager for PHP. Ensure you have Composer installed on your system.

```bash
composer require adhocore/json-fixer
```

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

### Fix Truncated JSON Strings in PHP

Source: https://github.com/adhocore/php-json-fixer/blob/main/readme.md

Demonstrates the basic usage of the Json Fixer class to repair incomplete JSON strings. It instantiates the Fixer and calls the fix method. The library automatically adds necessary closing characters to form valid JSON. It handles various truncation scenarios, padding with `null` by default for missing values.

```php
use Ahc\Json\Fixer;

$json = (new Fixer)->fix('{"a":1,"b":2');
// {"a":1,"b":2}

$json = (new Fixer)->fix('{"a":1,"b":true,');
// {"a":1,"b":true}

$json = (new Fixer)->fix('{"b":[1,[{"b":1,"c"');
// {"b":[1,[{"b":1,"c":null}]]}

// For batch fixing, you can just reuse same fixer instance:
$fixer = new Fixer;

$fixer->fix('...');
$fixer->fix('...');
// ...
```

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

### Customize Missing Value Padding in PHP JSON Fixer

Source: https://github.com/adhocore/php-json-fixer/blob/main/readme.md

Shows how to customize the value used to pad missing JSON elements. The `missingValue()` method allows you to specify a default value, such as `null`, `true`, or even a custom string like 'truncated'. This provides flexibility in how incomplete JSON structures are completed.

```php
// key b is missing value and is padded with `null`
$json = (new Fixer)->fix('{"a":1,"b":');
// {"a":1,"b":null}

// key b is missing value and is padded with `true`
$json = (new Fixer)->missingValue(true)->fix('{"a":1,"b":');
// {"a":1,"b":true}

// key b is missing value and is padded with `"truncated"`
// Note that you can actually inject a whole new JSON subset as 3rd param
// but that should be a valid JSON segment and is not checked by fixer.
$json = (new Fixer)->missingValue('"truncated"')->fix('{"a":1,"b":');
// {"a":1,"b":"truncated"}
```

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

### Handle JSON Fixing Errors Silently in PHP

Source: https://github.com/adhocore/php-json-fixer/blob/main/readme.md

Illustrates how to control the error handling behavior of the Json Fixer. By default, if the fixer cannot repair the JSON, it throws a RuntimeException. Using the `silent()` method prevents this, returning the original input string instead.

```php
(new Fixer)->silent()->fix('invalid');
// 'invalid'

(new Fixer)->silent(true)->fix('invalid');
// 'invalid'

(new Fixer)->silent(false)->fix('invalid');
// RuntimeException
```

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

### Fix Truncated JSON Strings with PHP

Source: https://context7.com/adhocore/php-json-fixer/llms.txt

The `fix()` method analyzes and repairs truncated JSON strings by appending necessary closing brackets, quotes, and padding incomplete values to produce valid JSON. It handles various truncation scenarios including missing braces, incomplete nested objects, missing values, and partial literals. The library has no external dependencies and works with PHP 5.4+.

```php
<?php
use Ahc\Json\Fixer;

// Basic object truncation - missing closing brace
$fixer = new Fixer();
$result = $fixer->fix('{"a":1,"b":2');
// Returns: {"a":1,"b":2}

// Array with nested incomplete object
$result = $fixer->fix('{"b":[1,[{"b":1,"c"');
// Returns: {"b":[1,[{"b":1,"c":null}]]}

// Missing value after colon
$result = $fixer->fix('{"a":1,"b":true,');
// Returns: {"a":1,"b":true}

// Incomplete string value
$result = $fixer->fix('["b",{"a');
// Returns: ["b",{"a":null}]

// Partial boolean literals
$result = $fixer->fix('{"a":"b","b":[t');
// Returns: {"a":"b","b":[true]}

// Complex nested structure
$result = $fixer->fix('[ {"id":1, "data": []}, {"id":2, "data": [');
// Returns: [ {"id":1, "data": []}, {"id":2, "data": []}]

// Reuse fixer instance for batch processing
$fixer = new Fixer();
$json1 = $fixer->fix('{"user":"john');
$json2 = $fixer->fix('[1,2,3');
$json3 = $fixer->fix('{"active":t');

```

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

### Configure Error Handling (Silent Mode) in PHP JSON Fixer

Source: https://context7.com/adhocore/php-json-fixer/llms.txt

The `silent()` method controls the error handling behavior of the JSON fixer. When enabled (`true`), it returns the original input for unfixable JSON instead of throwing a `RuntimeException`, allowing for graceful degradation. When disabled (`false`), exceptions are thrown on failure. This is useful for production environments where exceptions might disrupt the application flow.

```php
<?php
use Ahc\Json\Fixer;

// Silent mode enabled - returns original input on failure
$fixer = new Fixer();
$result = $fixer->silent()->fix('invalid');
// Returns: 'invalid' (no exception thrown)

// Explicitly enable silent mode
$result = $fixer->silent(true)->fix('{"a"}');
// Returns: '{"a"}' (malformed JSON returned as-is)

// Disable silent mode - throws RuntimeException on failure
try {
    $result = $fixer->silent(false)->fix('{,"a');
} catch (\RuntimeException $e) {
    echo $e->getMessage();
    // Output: Could not fix JSON (tried padding `...`)
}

// Production-safe batch processing with silent mode
$fixer = new Fixer();
$fixer->silent(true);

$jsonStrings = ['{"valid":true}', '{"incomplete', 'completely invalid', '[1,2,3'];
$results = [];

foreach ($jsonStrings as $json) {
    $fixed = $fixer->fix($json);
    $results[] = $fixed;
    // All strings processed without exceptions
}

```

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

### Customize Missing Value Replacements in PHP JSON Fixer

Source: https://context7.com/adhocore/php-json-fixer/llms.txt

The `missingValue()` method allows customization of the value inserted when a JSON object key is present but its value is missing. By default, missing values are replaced with `null`. This method accepts any valid JSON value (string, number, boolean, object, array, or null) to replace the missing value, offering flexibility for various data processing needs.

```php
<?php
use Ahc\Json\Fixer;

// Default behavior - missing values become null
$fixer = new Fixer();
$result = $fixer->fix('{"a":1,"b":');
// Returns: {"a":1,"b":null}

// Set missing values to boolean true
$fixer = new Fixer();
$result = $fixer->missingValue(true)->fix('{"a":1,"b":');
// Returns: {"a":1,"b":true}

// Set missing values to boolean false
$result = $fixer->missingValue(false)->fix('{"active":');
// Returns: {"active":false}

// Set missing values to custom string
$fixer = new Fixer();
$result = $fixer->missingValue('"truncated"')->fix('{"a":1,"b":');
// Returns: {"a":1,"b":"truncated"}

// Set missing values to number
$result = $fixer->missingValue('0')->fix('{"count":');
// Returns: {"count":0}

// Set missing values to empty object
$result = $fixer->missingValue('{}')->fix('{"config":');
// Returns: {"config":{}}

// Explicitly set null (redundant but allowed)
$result = $fixer->missingValue(null)->fix('{"value":');
// Returns: {"value":null}

// Chain configuration methods
$fixer = new Fixer();
$result = $fixer
    ->silent(true)
    ->missingValue('"unknown"')
    ->fix('{"status":');
// Returns: {"status":"unknown"}

```

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