JWT HMAC Signer

Sign a payload as an HS256 token, or verify one, using a secret that stays in this tab.

Remember work on this deviceLocal saving paused

Private to this browser, not a cloud backup. Saves expire 7 days after the last save. Avoid saving sensitive data on shared devices.

Local saving is disabled for this sensitive tool. Use sanitized test data and clear the editor when finished.

Input

Paste or edit your payload or token, then click “Run tool”.

Type, paste or drop a file

JSON

{"sub":"user-123","role":"developer"}

Ln 1, Col 1Spaces: 2UTF-837 bytes

Signed token (read-only).

Read-only

JSON

Ln 1, Col 1Spaces: 2UTF-80 bytes

Ready when you arePaste your input, then press Run tool or ⌘ ↵

Create HS256 test tokens for local development, or check a token was signed with the secret you expect.

{
  "sub": "user-123",
  "role": "developer"
}