JWT Encoder & Decoder

Real-time JSON Web Token generator, validator, and decoder tool

Real-time Encoding Token Decoding Signature Validation Expiry Check One-Click Copy JSON Formatter Multiple Algorithms Payload Visualization Token Export History Log
Input Configuration
The JWT header defines the token type and signing algorithm.
The payload contains the claims (user data and metadata).
Used to sign the token. Keep it secure!
Decode Existing Token
Generated Token & Details
Your encoded JWT token will appear here...
HEADER: Algorithm & Token Type
PAYLOAD: Claims (Data)
SIGNATURE: Verification Signature
{"sub": "1234567890", "name": "John Doe", "iat": 1516239022, "exp": 1916239022, "admin": true}
Token structure is valid
Token expiration: 2030-10-10 (Valid)
Signature not verified (requires secret key)

How to Use JWT Encoder/Decoder Tool: A Complete Guide

What is JWT?

JSON Web Token (JWT) is an open standard (RFC 7519) 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.

Encoding a JWT Token

  1. Select your preferred algorithm (HS256, HS384, HS512, or none)
  2. Modify the header JSON if needed (default is usually fine)
  3. Enter your payload data as valid JSON
  4. Provide a secret key for signing the token
  5. Click "Encode JWT" to generate your token instantly

Decoding a JWT Token

  1. Paste an existing JWT token in the "Decode Existing Token" section
  2. Click "Decode & Validate Token"
  3. View the decoded header and payload in the JSON viewer
  4. Check the validation tab for token integrity and expiration status

Common Use Cases

  • API Authentication: Securely transmit user information between client and server
  • Session Management: Stateless user sessions in web applications
  • Information Exchange: Safely transmit information between parties
  • Developer Testing: Debug and test JWT implementations
Pro Tip: Always verify the signature of JWTs received from untrusted sources. Never store sensitive information in JWT payloads as they can be easily decoded.