> For the complete documentation index, see [llms.txt](https://web-token.spomky-labs.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://web-token.spomky-labs.com/1.x/migration/from-spomky-labs-jose/header-checking.md).

# Header Checking

The header checker manager is part of the checker component (`web-token/jwt-checker`).

`spomky-labs/jose` and this framework works a similar way thus migration is very easy. The main differences are:

* There are two managers: one for the claims, one for the headers.
* The manager needs at least one Token Support handler.

You will find `JWS` and `JWE` Token Supports in the `web-token/jwt-signature` and `web-token/jwt-encryption` components respectively.

Checkers must implement the `Jose\Component\Checker\HeaderChecker` interface.

**Before**

```php
<?php

use Jose\Checker\CheckerManager;
use Jose\Checker\AudienceChecker;
use Jose\Checker\CriticalHeaderChecker;

$checkerManager = new CheckerManager();
$checkerManager->addHeaderChecker(new AudienceChecker('My Server'));
$checkerManager->addHeaderChecker(new CriticalHeaderChecker());

$checkerManager->checkJWS($jws, $signature_index);
```

**After**

```php
<?php

use Jose\Component\Checker\AudienceChecker;
use Jose\Component\Checker\HeaderCheckerManager;
use Jose\Component\Signature\JWSTokenSupport;

$checkerManager = new HeaderCheckerManager();
$checkerManager->add(new AudienceChecker('My Service'));
$checkerManager->addTokenTypeSupport(new TokenSupport());
```

*Please note that the header* `crit` *is always checked.*


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