JWT Encoder

Create and encode JSON Web Tokens (JWT) with custom header, payload, and secret

Security Notice

This is a demo tool for learning purposes. Never use weak secrets or expose sensitive information in production JWTs.

Header

Common algorithms: HS256, HS384, HS512, RS256, ES256

Payload

Standard claims: sub, iss, aud, exp, nbf, iat, jti

Secret Key

For HS256, use a secret of at least 256 bits (32 characters)

About JWT Encoding

Process: The JWT is created by base64url-encoding the header and payload, then signing the combination with your secret key.
Algorithm: This tool uses HMAC-SHA256 (HS256) for signing. The algorithm specified in the header must match the implementation.
Security: The secret key should be kept secure and be sufficiently long (256+ bits for HS256).
Standard Claims:
  • iss - Issuer
  • sub - Subject
  • aud - Audience
  • exp - Expiration Time
  • nbf - Not Before
  • iat - Issued At
  • jti - JWT ID

About JWT Encoder

A comprehensive JWT (JSON Web Token) encoder that allows you to create, customize, and generate valid JWT tokens with custom headers, payloads, and secret keys. This tool supports multiple signing algorithms and provides real-time token generation for development and testing purposes.

Why use a JWT Encoder?

Creating JWT tokens manually for testing authentication flows, API development, or integration testing can be time-consuming and error-prone. This encoder streamlines the process by providing an intuitive interface to generate properly formatted and signed JWT tokens, ensuring your authentication testing is both efficient and accurate.

Who is it for?

Essential for backend developers, API engineers, QA testers, and security professionals who need to generate JWT tokens for testing authentication systems. Perfect for developers learning JWT implementation or experienced teams who need quick token generation for development and testing workflows.

How to use the tool

  1. Configure the JWT header with your desired algorithm (HS256, RS256, etc.)
  2. Add custom claims and data to the payload section
  3. Enter your secret key or private key for token signing
  4. Click generate to create your encoded JWT token
  5. Copy the generated token for use in your applications or API testing tools

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