JWT Decoder
Decode JWT online and inspect bearer tokens locally in your browser. View header, payload, and OAuth 2.0 claims instantly. Free, no upload, no account.
Runs locally in your browser. Your input is not uploaded to DevToolMate servers.
Not signature verification
Decoding a JWT does not verify that the token is authentic. Anyone can create a token with arbitrary claims.
Developer Quick Tips
- Paste your JWT or bearer token to decode header and payload JSON instantly in your browser without uploading to any server.
- Inspect OAuth 2.0 claims like sub, aud, iss, and at_hash to debug authentication flows and token structure during development.
- Decode JWT tokens locally to check payload claims and expiration before making authenticated API calls.
- Extract and copy decoded payload data for logging and troubleshooting without exposing the full token to external services.
- Remember: decoding displays token segments but does not verify signatures, validate issuer trust, or check token authenticity.
Frequently asked questions
How do I decode a JWT token online?
Paste your full JWT (three dot-separated segments) into the decoder. It instantly displays the decoded header and payload JSON in your browser. No upload, no account, no server processing.
What is a JWT decoder and what does it do?
A JWT decoder parses the header and payload segments of a JSON Web Token and displays them as readable JSON. This tool runs locally in your browser so you can inspect claims like sub, aud, iss, and exp without sending your token anywhere.
Can I decode JWT tokens online for free?
Yes. DevToolMate's JWT Decoder is free, runs entirely in your browser, and requires no account or login. Paste your bearer token and inspect it instantly.
Does this JWT decoder verify signatures?
No. This tool decodes and displays the header and payload only. It does not verify JWT signatures, validate issuer trust, or check token expiration. Use it for inspection and debugging, not for security validation.
How do I inspect a bearer token's claims?
Paste your full bearer token into the decoder. It will display the decoded header and payload JSON, showing all claims like aud, iss, exp, sub, and at_hash if present.
What is the at_hash claim in a JWT?
The at_hash claim is a hash of the access token used in OAuth 2.0 and OpenID Connect flows to bind the token to the authorization response. This decoder displays it if present in your token's payload.
Will my JWT token data be uploaded or stored?
No. Your token input stays on your device for the current browser session only. Closing the tab clears all input. Nothing is sent to DevToolMate servers or stored anywhere.
Related tools
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- JWT Payload Viewer: Decode JWT payload online free. View claims like sub, exp, iat in your browser. No upload, no account, no signature verification.
- Base64 Decoder: Free online base64 decoder. Decode base64 strings to UTF-8 text instantly in your browser with no upload, no account, and no server processing.