JWT Decoder — Decode JSON Web Tokens Online

JWT Token

🔑 Header

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

📦 Payload

{
  "sub": "1234567890",
  "name": "John Doe",
  "admin": true,
  "iat": 1516239022,
  "exp": 1900000000
}

📋 Claims

sub1234567890

nameJohn Doe

admintrue

iat15162390221/18/2018, 1:30:22 AM

exp19000000003/17/2030, 5:46:40 PM ✅ Valid

🔏 SignatureVZfBrCrn-b2qGRXPNLRn-9rBAdyhOLnJFxOx316YJQg

Frequently Asked Questions about JWT Decoder

What is a JWT token?▼

A JSON Web Token (JWT) is a compact, URL-safe token format used for authentication. It contains three parts: header (algorithm), payload (claims like user ID, expiration), and signature (verification). JWTs are widely used in OAuth2 and API authentication.

Is it safe to decode JWT tokens online?▼

With SnapTools, yes. Decoding happens entirely in your browser — the token never leaves your device. However, never share JWT tokens publicly as they may contain sensitive information like user IDs and permissions.

How do I check if a JWT is expired?▼

Paste your JWT into the decoder and look at the 'exp' (expiration) claim. SnapTools automatically compares it to the current time and shows whether the token is still valid or has expired.