Free JWT Token Encoder
Quick Tips
- • This tool runs entirely in your browser - your data stays private.
- • Press Ctrl+V (Cmd+V on Mac) to quickly paste text.
- • Use the Copy button to save your result to clipboard.
- • Bookmark this page for quick access!
Create and sign JSON Web Tokens with custom claims and algorithms.
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Examples
{"sub":"123","name":"Test User","exp":1893456000}
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...
Why Use This Tool?
What problems does this solve?
Testing authentication systems requires tokens with specific claims. Creating test JWTs manually is tedious and error-prone. This tool generates properly formatted, signed tokens for development and testing.
Common use cases:
- Creating test tokens for API development
- Generating tokens with specific expiration for testing
- Building tokens with custom claims for feature testing
- Learning JWT structure and signing
- Debugging token verification issues
Who benefits from this tool?
Developers building and testing JWT-based authentication. QA engineers creating test scenarios. Students learning about token-based authentication.
Privacy first: All encoding happens locally in your browser. Your payload and secret key never leave your device.
Frequently Asked Questions
No, you should not use online tools to create production tokens. This tool is for testing, development, and learning only. Production tokens should be generated server-side with proper key management.
For testing, any string works. For real applications, use cryptographically random keys at least 256 bits (32 bytes) long. Never use predictable keys or share keys in client-side code.
Add an "exp" claim with a Unix timestamp (seconds since 1970-01-01). For example, exp: 1893456000 represents a specific future date. Libraries can help calculate these timestamps.
HS256 uses a shared secret (symmetric) - same key for signing and verification. RS256 uses public/private key pairs (asymmetric) - private key signs, public key verifies. This tool supports HS* algorithms only.
If you include claims like "iat" (issued at) that change with time, the token will differ. With identical header, payload, and secret, the token will be identical.
Yes, add any JSON properties to the payload. Common custom claims include user roles, permissions, and application-specific data. Just remember the payload is visible to anyone with the token.
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