JWT Decoder & Encoder - Free Online Tool

Decode and inspect JSON Web Tokens (JWT) with our free online tool.

What is JWT?

JWT (JSON Web Token) is an open standard for securely transmitting information between parties as a JSON object. JWTs are commonly used for authentication and information exchange.

JWT Structure

A JWT consists of three parts separated by dots (.):

xxxxx.yyyyy.zzzzz
  │      │      │
  │      │      └── Signature
  │      └── Payload (Claims)
  └── Header

1. Header

{
  "alg": "HS256",
  "typ": "JWT"
}

2. Payload (Claims)

{
  "sub": "1234567890",
  "name": "John Doe",
  "iat": 1516239022,
  "exp": 1516242622
}

3. Signature

The signature is used to verify the message wasn’t changed along the way.

Common JWT Claims

Claim	Name	Description
`iss`	Issuer	Who issued the token
`sub`	Subject	Who the token is about
`aud`	Audience	Who the token is intended for
`exp`	Expiration	When the token expires
`iat`	Issued At	When the token was issued
`nbf`	Not Before	Token not valid before this time

Why Use Our JWT Decoder?

Instant decoding - Paste a token and see the contents immediately
Expiration check - See if your token is expired
Secure - All processing happens in your browser
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