JWT Decoder
JWT Decoder
JWT Decoder supports parsing JWT tokens so you can inspect the header, payload, and time-based claims for API debugging, expiry checks, and token review.
Input Text
Note: This tool only decodes and displays the token; it does not verify the signature.
JWT DecoderPaste the complete JWT (three parts separated by ".")Auto-decode and display Header, Payload, and SignatureView time claims (exp/nbf/iat) and status
Quick Start
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Common Scenarios
API debugging
Quickly view token content to verify claims
Expiration check
Inspect exp field to see if token is still valid
Learning JWT
Understand Header/Payload structure and Base64URL encoding
Environment comparison
Compare tokens across dev/test/prod environments
Usage Advice
This tool only decodes—does not verify signatures; use backend validation in production
Avoid pasting tokens with sensitive data on public devices
Time fields are Unix timestamps (seconds); the tool auto-converts to local/UTC time
Limitations & Compatibility
Only Base64URL decoding—no signature verification
Only standard 3-part JWT supported; JWE or custom formats not supported
Nested JWTs (JWT inside payload) are not processed
Privacy & Security
All processing happens locally in your browser. You can replace, clear, and re-run the current content at any time.
If the token contains sensitive info, use in a private environment
FAQ
Ensure the JWT has 3 parts (Header.Payload.Signature) separated by "."; check for extra spaces or line breaks
Server may have grace period or clock skew; this tool uses local time and is for reference only