JWT Decoder & Token Analyzer

Decode and analyze JSON Web Tokens with our professional tool. Inspect headers, payloads, and signatures with real-time validation.

Decode JWT
Analyze Content
Validate Tokens

JWT Token Input

Paste your JWT token to decode and analyze

Paste your JWT token here. It should contain header.payload.signature

Ready to decode

Decoded Results

Token analysis and decoded content

Decode a JWT token to see results

Decode JWT

Decode and view the header, payload, and signature components

Analyze Claims

Understand standard JWT claims and custom payload data

Validate Tokens

Check token structure and identify potential issues

Understanding JSON Web Tokens (JWT)

What are JWTs?

JSON Web Tokens (JWT) are a compact, URL-safe means of representing claims to be transferred between two parties. They are commonly used for authentication and authorization in web applications.

JWT Structure:

header.payload.signature

Three Base64URL-encoded parts separated by dots

JWT Components

A JWT consists of three main parts: header, payload, and signature. Each part serves a specific purpose in the token's functionality and security.

Header
Contains algorithm and token type
Payload
Contains claims and user data
Signature
Ensures token integrity

Standard JWT Claims

Registered Claims

iss (Issuer): Token issuer
sub (Subject): Token subject
aud (Audience): Intended recipient
exp (Expiration): Expiration timestamp
nbf (Not Before): Not valid before
iat (Issued At): Issued timestamp
jti (JWT ID): Unique identifier

Common Use Cases

  • API Authentication
  • Single Sign-On (SSO)
  • Session Management
  • Authorization Tokens
  • Information Exchange

JWT Security Best Practices

Token Handling

  • Always validate JWT signatures
  • Check expiration times (exp claim)
  • Verify issuer and audience claims
  • Use HTTPS for token transmission

Storage & Security

  • Store tokens securely (httpOnly cookies)
  • Implement token refresh mechanisms
  • Use appropriate token expiration times
  • Monitor for token abuse and implement rate limiting