JWT Decoder
Decode JWT header and payload (no signature verification).
- 100% free
- Private in browser
- No signup
- No watermarks
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About JWT Decoder
Auth bugs often hide in token claims. JWT Decoder on TheToolss Base64URL-decodes a JSON Web Token so you can inspect header algorithm fields and payload claims like sub, exp, and roles without a backend. Paste a token from logs or local storage, read the JSON, and debug faster. Decoding stays in your browser — free and private (never paste production secrets into untrusted tools).
How to use JWT Decoder
- Paste a JWT string (header.payload.signature).
- Decode to view header and payload JSON.
- Inspect claims and copy fields you need for debugging.
Key features
- Decode JWT header and payload
- Readable JSON claims view
- Helpful for auth debugging
- Copy claim values easily
- Private browser decoding
Frequently asked questions
- Is JWT Decoder free?
- Yes. Decode JWTs free on TheToolss.
- Does decoding verify the signature?
- Decoding shows claims; cryptographic verification needs your secret or public key elsewhere.
- Is it safe to paste tokens?
- Prefer non-production samples. Tokens can grant access — treat them as sensitive.
- Is my token uploaded?
- No. Decoding runs in your browser.
- What is exp?
- exp is the expiration claim (Unix time) many APIs use to reject old tokens.
Related In-Depth Guides
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