Developer
JWT Token Decoder Online
- Browser-based
- No signup
This JWT token decoder online parses JSON Web Tokens into readable header and payload JSON. Paste a JWT from OAuth, API gateways, or Auth0 to inspect claims, expiry, and issuer—decode only; signature verification is separate.
Decoding does not validate signatures—a tampered token still decodes. Always verify signatures server-side in production.
Never paste production tokens with live privileges into untrusted websites; Utilnivo runs decode locally in the browser.
100% Client-Side
Your data never leaves your computer.
How to use this tool
Paste the JWT string (three dot-separated parts), view decoded header and payload JSON, and check expiration timestamps.
Worked example
Example: decode an access token to see `exp` (expiry) and `sub` (subject) before tracing a 401 Unauthorized in your API logs.
When to use this
- Debugging OAuth and OpenID Connect flows.
- Reading claims during integration testing.
- Teaching JWT structure in security workshops.
Common examples
- Access token from OAuth login → inspect `exp`, `sub`, and `roles` claims.
- Staging vs production token → compare `iss` and `aud` without verifying signature locally.
- Expired session token → confirm `exp` timestamp against current time in the payload view.
- Staging ID token → confirm `aud` matches your SPA client ID before release.
- Expired refresh token → verify `exp` claim against local clock skew.
What people search for
- jwt decoder
- decode jwt token
- jwt payload viewer
- json web token decoder
- inspect bearer token
Common mistakes
- Trusting decoded content without signature verification.
- Sharing session tokens in screenshots or tickets.
- Confusing access tokens with ID tokens.
Related long-tail tasks
- check jwt expiration time
- decode jwt header alg field
- compare two jwt payloads
How it works
Paste a JWT (optionally with a Bearer prefix). The tool splits header, payload, and signature, Base64URL-decodes the first two segments, and pretty-prints them as JSON. Common time claims (iat, nbf, exp) are shown as timestamps. Signatures are displayed but not verified.
Limitations
Decoding a JWT does not verify its signature or prove the token is valid, trusted, or unexpired. Do not paste production secrets into untrusted tools.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Related JWT Decoder guides
These pages use the same jwt decoder with guides tailored to specific search intents.
Frequently asked questions
Does this verify signatures?
No. It only Base64URL-decodes header and payload. Verify signatures with your library and secret/key.
Is my token sent to a server?
Standard decode runs locally in your browser on Utilnivo.
Token has two parts only?
Standard JWTs have header.payload.signature. Some opaque tokens are not JWTs and will not decode.
Related tools
Related pages
- Browse all free online tools on Utilnivo
- Explore more developer tools on Utilnivo
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- JWT Encoder — Encode and sign JWTs with HS256 in your browser.
- JWT Generator — Generate sample JWTs with common claims.
- JSON Formatter — Format, minify, and validate JSON with optional key sorting.
- JSON Compare — Compare two JSON documents and list structural differences.
- XML Formatter — Format, minify, and validate XML with readable indentation.
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