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JWT Decoder
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JWT Decoder & Token Inspector

Decode and inspect JSON Web Tokens (JWT) online. View header, payload claims, expiration timestamps, and signature status in your browser.

Header & Payload claims inspector
Expiration date & countdown timer
Issued-at diagnostics
100% private client-side decoding
Step-by-Step Guide

How to Use JWT Decoder Online

Follow these quick steps to process your data online directly in your browser with zero latency and 100% privacy.

1
Step 1Splits token into header, payload, and signature segments separated by dots.
2
Step 2Decodes Base64URL segments into valid JSON objects using client-side JavaScript.
3
Step 3Inspects standard claims including exp (Expiration), iat (Issued At), and nbf (Not Before).
Demonstration

Example Input & Output

Decodes Base64URL-encoded header and payload segments of a JWT token, displaying formatted JSON claims and expiration status.

Encoded JWT String
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkFsZXgiLCJyb2xlIjoiRGV2ZWxvcGVyIiwiZXhwIjoyNTI0NjA4MDAwfQ.e-sample-signature-here
Decoded Payload & Claims
{
  "sub": "1234567890",
  "name": "Alex",
  "role": "Developer",
  "exp": 2524608000
}
Applications

Common Use Cases

Auth0 & Firebase Token Debugging

Inspect user claims, roles, and expiration dates in authentication tokens.

Guidelines

Specifications & Gotchas

Signature Verification vs Decoding

Decoding inspects token contents. Verifying the signature requires the public/private key or HMAC secret.

Knowledge

Frequently Asked Questions

How do I decode a JWT token?

Paste your JWT string into the editor; the header, payload claims, and expiration date render instantly.

Does this tool verify token signatures?

This tool decodes and inspects token payload structure and expiration. Cryptographic signature verification requires supplying the secret key.

Workflow

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