Secure JWT Encoder – Online jwt encoder Tool
Encode JSON Web Tokens with custom payload and header.
Header
Payload
Verify Signature
Encoded Token
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c
How to Use the Online JWT Encoder
A JSON Web Token (JWT) is a compact, URL-safe means of representing claims to be transferred between two parties. Our JWT Encoder allows you to build tokens for testing and debugging purposes. You can customize the header (metadata about the token) and the payload (the actual data or claims) and sign it using a secret key with the HS256 algorithm.
The encoded token is color-coded to help you visualize its structure: red for the header, purple for the payload, and blue for the signature.
Why Encode JWTs with metatool.in?
- Visual Feedback: See your token update in real-time as you modify the JSON structures.
- Privacy: We don't log your payloads or secrets. Everything is handled within your browser instance.
- Easy Debugging: Quickly generate tokens for local development and testing without writing custom scripts.
Frequently Asked Questions
JSON Web Token (JWT) is an open standard that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed.
A JWT consists of three parts separated by dots (.): Header, Payload, and Signature. Each part is Base64Url encoded.
Yes, our encoder runs entirely in your browser. Your secret is never sent to any server. However, for production systems, you should always handle secrets in a secure, controlled environment.
Related Free Tools
- JWT Decoder — Decode JSON Web Tokens instantly and view claims.