Developer
JWT Decoder
- Browser-based
- No signup
Browser-based
Paste a JWT to decode its header and payload as readable JSON. Optional Bearer prefixes are supported. Common time claims (iat, nbf, exp) are shown as timestamps with expiry status. The signature is displayed but not verified. Decoding runs in your browser.
How to use this tool
1. Paste a JWT into the input area. 2. Review decoded Header and Payload JSON in the results. 3. Check algorithm, token type, and time-related claims if present. 4. Copy header, payload, or signature sections as needed. 5. Do not paste production secrets into shared machines.
Worked example
Example: a sample JWT with alg HS256 shows the header algorithm and payload claims such as sub and exp when decoded—signature verification is not performed.
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.
Common searches
- jwt decoder
- decode jwt token
- jwt payload viewer
- json web token decoder
- inspect bearer token
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.
Important notice
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.
Frequently asked questions
Does this verify the JWT signature?
No. The tool only decodes and displays the header, payload, and signature. It does not validate signatures or trust the token.
What time claims are shown?
When present, iat (issued at), nbf (not before), and exp (expires) are shown as ISO timestamps with a simple status such as expired or active.
Is my token stored?
No. Decoding runs locally in your browser and tokens are not stored.
Part of these workflows
This tool is one step in a longer job. Jump straight to your step or open the full workflow guide.
Related tools
Related pages
- JWT tools — compare developer tools and read FAQs
- Debug a JWT or API token — step-by-step workflow
- Browse all free online tools on Utilnivo
- Explore more developer tools on Utilnivo
- JWT Encoder — Encode and sign JWTs with HS256 in your browser.
- JWT Generator — Generate sample JWTs with common claims.
- Base64 Encoder & Decoder — Encode and decode text with Base64.
- JSON Formatter — Format, minify, and validate JSON with optional key sorting.
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