Developer Utilities · Free tool
JWT Decoder
Paste a JWT — see header, payload, and signature decoded. Client-side only, your token never leaves the browser.
Expiry: expired 929d 17h ago (2023-11-14T23:13:20.000Z)
Issued: issued 929d 18h ago (2023-11-14T22:13:20.000Z)
This tool does not verify signatures. Never trust a JWT without server-side verification.
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What it does
Paste a JSON Web Token (JWT) to decode its header and payload locally in your browser. The tool reveals the algorithm, issuer, expiry, and any custom claims — and shows a human-readable version of exp and iat timestamps (“expires in 2h 14m” / “expired 3d ago”).
No signature verification — that requires the signing key and is done server-side in production code. Use this for quick debugging, never for authentication. Tokens never leave your browser. See Base64 encoder for raw base64url work or hash generator for signing material.
Embed this tool on your siteShow snippetHide
Paste this snippet into any page. Loads on-demand (lazy), no tracking scripts, and sized to most dashboards. Replace the height to fit your layout.
<iframe src="https://freetoolarena.com/embed/jwt-decoder" width="100%" height="720" frameborder="0" loading="lazy" title="JWT Decoder" style="border:1px solid #e2e8f0;border-radius:12px;max-width:720px;"></iframe>How to use it
- Paste the JWT (three base64url segments separated by dots).
- Review the decoded header and payload.
- Check the human-readable expiry and issued-at times.
- Copy individual sections with the copy buttons.
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Learn more
Guides about this topic
- Developers & Technical · GuideHow to use JWT tokens securelyImplement secure JWT authentication by choosing RS256, setting expiration, using httpOnly cookies, and preventing 'alg: none' attacks in your browser for free.
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- Developers & Technical · GuideHow to encode and decode Base64Understand the 3-to-4 mechanic and 33% overhead for standard, URL-safe, and MIME Base64. Free online reference to avoid common mistakes, no download needed.
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