Why this tool stays in the browser

Assemble header and payload locally to produce a sample JWT for fixtures and decoder tests. This is not your production signing service — keep real secrets off the page. Decode the result in JWT Decoder without sending either token to a third party.

Related: JWT Decoder · UUID Generator

FAQ

Can I sign with a production secret here?: You can type a secret in the tab, but you should not. Use fixtures. This site does not store the secret.
Does this replace an auth server?: No. It is a local sample generator for debugging claims and the decoder.
How do I inspect the output?: Paste it into JWT Decoder on this site — also offline.

JWT Generator

Create signed JWT tokens with custom headers, payloads, and expiry times.

Algorithm

Symmetric algorithms only (HS256/HS384/HS512). Asymmetric algorithms (RS/ES) require private keys.

Token Expiry

Secret Key

Keep this secret safe. Anyone with this key can generate valid tokens.

Header (JSON)

Payload (JSON)

Quick Add Claims

Generate a JWT token

Configure the algorithm, secret, and payload, then click Generate

Why this tool stays in the browser

FAQ

Can I sign with a production secret here?

You can type a secret in the tab, but you should not. Use fixtures. This site does not store the secret.

Does this replace an auth server?

No. It is a local sample generator for debugging claims and the decoder.

How do I inspect the output?

Paste it into JWT Decoder on this site — also offline.