JWT Generator

Generate JSON Web Token with HMAC-SHA256

Header

Payload

Secret

JWT Token

Click Generate to create JWT
⚠️ Note: This tool is only used for development/testing. Do not use real secrets in the browser.

JWT Generator Online - Professional free JSON Web Token generator tool for Developers

Tan Phat Digital's JWT Generator tool is the perfect solution for developers who need to quickly create and test JSON Web Tokens (JWT) during the process of developing and debugging authentication systems. JWT is an open standard (RFC 7519) widely used in modern web applications to securely transmit information between parties in the form of digitally signed JSON objects. The tool supports the HMAC-SHA256 algorithm - one of the most popular algorithms for JWT signing. The intuitive interface with color-coded output helps clearly distinguish the three parts of the JWT: Header (red), Payload (purple), and Signature (cyan). Automatically add standard claims with one click: iat (issued at), exp (expiration), nbf (not before), jti (JWT ID). Display decoded token information including issuance time and expiration time with color indicator (green if still valid, red if expired). Generate random secret key with UUID. Processed entirely in the browser, no data is sent to the server, ensuring security for the development workflow. Completely free, no account registration required.

Outstanding features

Generate JWT with HMAC-SHA256 algorithm standard RFC 7519
Editor for Header JSON with syntax validation
Editor for Payload JSON with custom claims
Auto-add standard claims: iat, exp, nbf, jti with one click
Secret key input with option generate random UUID
Color-coded JWT output: Header (red), Payload (purple), Signature (cyan)
Decode and display token info: issued at, expiration, subject
Expiration status indicator: green (valid) / red (expired)
Copy JWT token with one click
Completely offline processing on the browser
Do not send data to the server, absolutely confidential
Responsive interface, usable on mobile
Completely free, unlimited use

What is JWT and why do developers need JWT Generator?

JSON Web Token (JWT) is an open standard (RFC 7519) that defines how to securely transmit information between parties in the form of JSON objects. JWT is digitally signed with a secret key (HMAC) or public/private key pair (RSA, ECDSA), ensuring data integrity and authenticity. JWT is widely used in: Authentication - after the user logs in, the server returns the JWT, the client sends the JWT in each request to authenticate. Authorization - JWT contains user roles/permissions, server checks to authorize access. Information Exchange - secure data transfer between services in microservices architecture. Single Sign-On (SSO) - a JWT that can be used to authenticate across multiple domains. Developers need JWT Generator to: Test authentication flows in development. Debug JWT-related issues by creating tokens with specific claims. Learn and understand JWT structure and signing process. Create mock tokens for unit tests and integration tests. Verify JWT implementation in backend code.

Benefits when used

  • •Test authentication flows quickly in development
  • •Debug JWT-related issues by creating custom tokens
  • •Learn and understand JWT structure: Header, Payload, Signature
  • •Create mock tokens for unit tests and integration tests
  • •Verify JWT implementation trong backend code
  • •No need to setup backend to generate test tokens
  • •Save time compared to writing code generate JWT
  • •Visual feedback with easy-to-read color-coded output
  • •Expiration tracking helps test token lifecycle
  • •Secure because it processes locally, does not expose secrets

Detailed instructions on how to create JWT online

  1. 1View and edit Header JSON (default: alg HS256, type JWT)
  2. 2Edit Payload JSON with custom claims (sub, name, role, etc.)
  3. 3Click the +iat, +exp, +nbf, +jti buttons to auto-add standard claims
  4. 4Enter Secret key or click refresh icon to generate random UUID
  5. 5Click
  6. 6to create tokens
  7. 7See JWT output with 3 color-coded parts
  8. 8Check Token Info: issued at, expiration, subject
  9. 9Click the copy icon to copy the JWT to clipboard
  10. 10Paste the JWT into the Authorization header: Bearer <token>

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