Tool description

JWT Parser is a comprehensive online tool for decoding, parsing, and verifying JSON Web Tokens (JWT). This JWT token explorer allows you to inspect the structure of any JWT by breaking it down into its three main components: header, payload, and signature. You can verify JWT token online with signature verification capabilities using your secret key, and easily check JWT expiry status to ensure your tokens are still valid.

Features

  • Token Decoding: Automatically decodes and parses JWT tokens into readable JSON format
  • Component Breakdown: Explore JWT token structure with header, payload, and signature sections displayed separately
  • Check JWT Signature Online: Verify token signatures using HMAC algorithms (HS256, HS384, HS512)

What is JWT?

JWT (JSON Web Token) 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.

JWTs consist of three parts separated by dots (.):

  • Header: Contains the token type (JWT) and signing algorithm
  • Payload: Contains the claims (user data and metadata)
  • Signature: Used to verify the token hasn't been tampered with

Supported Algorithms

This tool supports HMAC (Hash-based Message Authentication Code) algorithms for signature verification:

  • HS256: HMAC with SHA-256
  • HS384: HMAC with SHA-384
  • HS512: HMAC with SHA-512

Note: Asymmetric algorithms (RS256, ES256, etc.) are not currently supported in this tool.