JWT Decoder & Inspector
AI EnhancedDecode any JWT token instantly to inspect its header, payload claims, and structure. Understand token expiration, issuer, audience, and all custom claims. The HeoLab JWT Decoder helps developers debug authentication issues and understand token contents.
Loading tool...Loading tool...
Common Use Cases
- Debug authentication issues in APIs
- Inspect JWT claims and expiration
- Verify token structure during development
- Understand OAuth and OIDC tokens
- Check token expiration before it causes errors
Frequently Asked Questions
What is a JWT token?
A JWT (JSON Web Token) is a compact, URL-safe token format used for authentication and information exchange. It consists of three Base64URL-encoded parts: header, payload, and signature.
Can this tool verify JWT signatures?
This tool decodes the header and payload for inspection. Signature verification requires the secret key, which you should never share publicly.
Is it safe to paste my JWT here?
For production tokens containing sensitive user data, we recommend using this tool in a secure environment. All processing happens server-side with no data retention.
Related Tools
JSON Formatter & ValidatorFormat, validate, and beautify JSON data instantly. Detect errors with precise line numbers.Base64 Encoder / DecoderEncode text and binary data to Base64 or decode Base64 strings. Supports URL-safe variant.Regex Tester & DebuggerTest regular expressions against strings in real-time. Visualize matches, groups, and flags.
Tool Info
CategorysecurityAI EnhancementAvailableData StorageZero retention