Developer Tools
JWT Decoder
FreeNo SignupPrivate — runs in your browser
Decode and inspect JWT tokens online for free. View header, payload, and signature claims with expiration validation. No signup required.
What is JWT Decoder?
JSON Web Tokens (JWTs) are the backbone of modern authentication. When debugging auth flows, you need to quickly inspect token contents. Our free JWT Decoder instantly parses any JWT, displaying the header algorithm, payload claims, and expiration status — all without sending your token to any server.
How to Use JWT Decoder
- 1Paste your JWT token into the input
- 2View the decoded header and payload
- 3Check expiration and other claims
- 4Copy individual sections as needed
Key Features & Benefits
Instant decoding of JWT header and payload
Human-readable timestamps for exp, iat, nbf
Color-coded claim types for easy reading
Token never leaves your browser
Frequently Asked Questions
What is a JWT?
A JSON Web Token is a compact, URL-safe token used for authentication and information exchange between parties.
Does this tool verify signatures?
This tool decodes and displays JWT contents. Signature verification requires the secret key, which should never be shared online.
Can I see token expiration?
Yes, the decoder shows all standard claims including iat (issued at), exp (expiration), and nbf (not before) with human-readable timestamps.