Header JSON
Note: alg in the header will be forced to the selected algorithm when generating.
Payload JSON
Secret
Notes: this tool uses Web Crypto locally in your browser to compute the HMAC and never uploads secrets or payloads.
Result
Compatibility: HS* uses HMAC with SHA-256/384/512. For RS256/ES256 and other asymmetric algorithms, you can use the RSA key generator tool and future extensions.
How to Use
1. Select Algorithm: Choose a signing algorithm (e.g., HS256, HS512) from the toolbar.
2. Set Secret: Choose the secret format (Text/Base64/Hex) and enter your secret key.
3. Edit Content: Modify the JSON data in the Header and Payload boxes. Use "Format" buttons to prettify JSON.
4. Generate Token: Click "Generate JWT" to calculate the signature and create the token.
5. Copy Result: Click "Copy JWT" above the result box to copy the token to your clipboard.
Tips & FAQ
Local & Secure All signature calculations are performed locally in your browser via the Web Crypto API. Your secrets and tokens are never uploaded to any server.
Algorithm Support Currently supports symmetric algorithms (HS256/HS384/HS512). For asymmetric algorithms (RS256, etc.), please stay tuned for updates.
Expiration Shortcut Click the "iat/exp(+1h)" button to quickly add the current time (iat) and an expiration time of one hour later (exp) to the Payload.
