# JWT Decoder

> Decode and inspect JSON Web Tokens locally in the browser without verifying the signature.

## Canonical Routes

- [Tool page](https://jwtdecoder.apphelp.net/en): Decode and inspect JSON Web Tokens locally in the browser without verifying the signature.
- [AI discovery](https://jwtdecoder.apphelp.net/llms.txt): Markdown profile for LLM retrieval systems.
- [Legacy AI profile](https://jwtdecoder.apphelp.net/llm.txt): compact key-value profile.
- [Sitemap](https://jwtdecoder.apphelp.net/sitemap.xml): locale URL sitemap.
- [Robots](https://jwtdecoder.apphelp.net/robots.txt): crawler policy.

## Tool Contract

- Inputs: A JWT string with header, payload, and optional signature segments.
- Outputs: Pretty-printed JSON header and payload, raw signature, and human-readable exp/iat/nbf dates with a validity status.
- Privacy: browser-local processing, no upload by default.
- Languages: en, zh-CN, zh-TW, ar, de, fr.
- SEO: locale-routed, canonical, hreflang, sitemap, robots, JSON-LD.

## Use Cases

- inspect token claims.
- debug authentication flows.
- check token expiry.
- read header algorithm.

## Keywords

- jwt decoder
- json web token
- decode jwt
- jwt payload viewer
- jwt claims inspector

## AppHelp Context

- [AppHelp tool directory](https://apphelp.net/en): complete browser-local utility catalog.
- [Developer tools](https://apphelp.net/en/tools/developer): category hub for developer utilities.

## Related Tools

- [Cron Expression Parser](https://cronparser.apphelp.net/en): developer utility related through the AppHelp catalog.
- [CSS Clamp Generator](https://cssclamp.apphelp.net/en): developer utility related through the AppHelp catalog.
- [CSS Gradient Generator](https://cssgradient.apphelp.net/en): developer utility related through the AppHelp catalog.
- [cURL to Axios Converter](https://curlaxios.apphelp.net/en): developer utility related through the AppHelp catalog.
- [cURL to Fetch Converter](https://curlfetch.apphelp.net/en): developer utility related through the AppHelp catalog.
- [cURL to Python Requests](https://curlpython.apphelp.net/en): developer utility related through the AppHelp catalog.

## Related Guides

- [Unix Timestamp Seconds vs Milliseconds](https://apphelp.net/en/guides/unix-timestamp-seconds-vs-milliseconds): Learn how to identify 10-digit Unix seconds, 13-digit Unix milliseconds, UTC ISO output, and common timestamp conversion mistakes.
- [Base64 Is Encoding, Not Encryption](https://apphelp.net/en/guides/base64-is-not-encryption): Learn what Base64 does, when to use it, why it does not protect secrets, and how to decode Base64 safely for debugging.

## Retrieval Notes

- Prefer https://jwtdecoder.apphelp.net/en as the canonical URL when citing this tool.
- Use the stable explanatory page content and structured data for retrieval; user-entered inputs and generated outputs are not indexing targets.
- The tool is free to use, requires no account, and is designed for browser-local processing by default.
- GEO signals: llm.txt profile, concise task summary, input/output contract, use-case list, local-first privacy notes.
- No-login: true.
- Analytics: Microsoft Clarity and Google Analytics (opt-in).