# Keys (JWK)

The JWK object is part of the core component (`web-token/jwt-core`). The may change concern the construction of the object. Its use is very similar.

**Before**

```php
<?php

use Jose\Object\JWK;

$key = new JWK([
    'kty' => 'RSA',
    'n' => '0vx7agoebGcQSuuPiLJXZptN9nndrQmbXEps2aiAFbWhM78LhWx4cbbfAAtVT86zwu1RK7aPFFxuhDR1L6tSoc_BJECPebWKRXjBZCiFV4n3oknjhMstn64tZ_2W-5JsGY4Hc5n9yBXArwl93lqt7_RN5w6Cf0h4QyQ5v-65YGjQR0_FDW2QvzqY368QQMicAtaSqzs8KJZgnYb9c7d0zgdAZHzu6qMQvRL5hajrn1n91CbOpbISD08qNLyrdkt-bFTWhAI4vMQFh6WeZu0fM4lFd2NcRwr3XPksINHaQ-G_xBniIqbw0Ls1jF44-csFCur-kEgU8awapJzKnqDKgw',
    'e' => 'AQAB',
    'alg' => 'RS256',
    'kid' => '2011-04-29',
]);

$key->has('kty'); // true
$key->get('kty'); // RSA
$key->thumbprint('sha256'); // The Sha-256 thumbprint of the key: "NzbLsXh8uDCcd-6MNwXF4W_7noWXFZAfHkxZsRGC9Xs"
json_encode($key); // The key as a Json object: "{"kty":"RSA","n":"0vx7agoebGcQSuuPiLJXZptN9n...8awapJzKnqDKgw","e":"AQAB","alg":"RS256","kid":"2011-04-29"}"
$key->toPublic(); // Converts a private key to a public one (not relevant in this example as the key is public)
$key->getAll(); // All key parameters
```

**After**

```php
<?php

use Jose\Component\Core\JWK;

$key = new JWK([
    'kty' => 'RSA',
    'n' => '0vx7agoebGcQSuuPiLJXZptN9nndrQmbXEps2aiAFbWhM78LhWx4cbbfAAtVT86zwu1RK7aPFFxuhDR1L6tSoc_BJECPebWKRXjBZCiFV4n3oknjhMstn64tZ_2W-5JsGY4Hc5n9yBXArwl93lqt7_RN5w6Cf0h4QyQ5v-65YGjQR0_FDW2QvzqY368QQMicAtaSqzs8KJZgnYb9c7d0zgdAZHzu6qMQvRL5hajrn1n91CbOpbISD08qNLyrdkt-bFTWhAI4vMQFh6WeZu0fM4lFd2NcRwr3XPksINHaQ-G_xBniIqbw0Ls1jF44-csFCur-kEgU8awapJzKnqDKgw',
    'e' => 'AQAB',
    'alg' => 'RS256',
    'kid' => '2011-04-29',
]);

$key->has('kty'); // Unchanged
$key->get('kty'); // Unchanged
$key->thumbprint('sha256'); // Unchanged
json_encode($key); // Unchanged
$key->toPublic(); // Unchanged
$key->all(); // The method name changed.
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://web-token.spomky-labs.com/1.x/migration/from-spomky-labs-jose/keys-jwk.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.