JSON Formatter
Prettify and validate JSON with syntax highlighting.
JWT Decoder
Decode and inspect JWT header, payload and signature.
Runs locally in your browser. No data is sent to a server.
About JWT Decoder
Paste any JSON Web Token to decode its header and payload, inspect registered claims like exp, iat, nbf, iss, and sub, and see human-readable expiration times. Handles Base64URL encoding and Unicode claim values. Decoding does not verify the signature — the token is never uploaded anywhere and stays entirely in your browser.