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JWT Decoder
Decode and inspect JWT header and payload safely in your browser.
Encoded Token
About JWT Decoder
Decode JSON Web Tokens (JWT) to inspect their headers and payloads. Useful for developers debugging authentication issues or verifying token contents like claims and expiration times. Completely secure as tokens are decoded locally.
Key Features
- Decodes Header and Payload
- Human-readable date formatting
- Color-coded JSON output
- Never sends tokens to server
- One-click copy
How It Works
- 1Paste your JWT string into the input box.
- 2The tool automatically decodes the sections.
- 3View the structured JSON data below.
Technical Specifications
Base64Url decodingJSON parsing with error handlingEpoch time conversion
Performance Metrics
Instant decoding
No server round-trips
Works offline
Frequently Asked Questions
Does this verify the signature?
No, this tool decodes the token for inspection. Signature verification requires your secret key, which you should not share online.
Is my token safe?
Yes, decoding happens entirely in your browser. We never see or store your tokens.