Free Tool

JWT Token Generator & Debugger

Generate JWT tokens with custom claims and expiration, or decode and validate existing tokens with a visual breakdown.

Header
Payload (Claims)
Click claims to toggle them in the payload:
Custom Claims (JSON)
Full Payload Preview
{}
Secret Key
For HS256/HS384/HS512. HMAC signing uses the Web Crypto API (client-side). RS256 generates structure only.
Generated Token
Click "Generate JWT Token" to create a token
Header Payload Signature
Paste JWT Token
Token Breakdown
Paste a JWT token above
Header Payload Signature
Header
—
Payload
—
Signature
—
Validation Status
ⓘ Paste a token above to see validation results
Open source

NexTool on GitHub

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Frequently Asked Questions

What is a JWT token?

A JSON Web Token (JWT) is a compact, URL-safe token for securely transmitting claims between parties. It has three Base64URL-encoded parts: header, payload, and signature.

How does JWT signing work?

The header and payload are Base64URL-encoded, concatenated with a dot, and signed using the specified algorithm (e.g., HMAC-SHA256). The signature ensures the token has not been modified.

Is this tool secure?

All token generation and decoding happens entirely in your browser using the Web Crypto API. No data is sent to any server. However, never use tokens generated here in production without proper key management.

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