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JWT Decoder – Decode & Inspect JSON Web Tokens Free

★ 4.8
(258 votes)

Securely decode complex JSON Web Tokens (JWT) natively to analyze comprehensive header/payload claims. Guarantee entirely private client-side execution.

JWT Token

Valid · Expires 11/20/2286, 5:46:39 PM

Issued 2/27/2024, 2:13:20 AM
HEADER · Algorithm & Type
{
  "alg": "HS256",
  "typ": "JWT"
}
PAYLOAD · Claims
{
  "sub": "user_12345",
  "name": "Arif Islam",
  "email": "arif@devriq.in",
  "role": "admin",
  "iat": 1709000000,
  "exp": 9999999999
}

Claim Explanations

sub

Subject — who the token refers to

name

User's display name

email

User's email address

role

User role / permission level

iat

Issued At — when the token was issued

exp

Expiration Time — when the token expires (Unix timestamp)

Signature not verified. JWT signature verification requires access to the secret key or RSA public key. This tool only decodes the header and payload — it cannot validate the token's authenticity.

How to Use the JWT Decoder

1

Paste Your JWT

Copy the JWT token from your API response, browser DevTools, Postman, or any other source and paste it in the box.

2

Inspect Claims

Header and payload are decoded instantly. Expiry, issued-at, and not-before timestamps are shown in human-readable format.

3

Debug & Copy

Check claim explanations for standard fields. Copy the decoded header or payload for use in your code.

Frequently Asked Questions

What is a JWT (JSON Web Token)?

A JWT is an open standard (RFC 7519) for securely transmitting information as a JSON object. It is commonly used for authentication in web APIs.

Can this tool verify the JWT signature?

No. Signature verification requires the secret/private key used to sign the token. This tool only decodes the header and payload portions.

Is it safe to paste my JWT here?

Yes. All processing is 100% client-side in your browser. Nothing is sent to any server. However, treat JWT tokens as sensitive credentials.

What does 'exp' mean in a JWT?

'exp' is the expiration claim — a Unix timestamp (seconds since Jan 1 1970) after which the token should no longer be accepted.

Why does a JWT have three parts?

A JWT has three Base64URL-encoded parts separated by dots: Header (algorithm), Payload (claims), and Signature (verification).

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https://tools.devriq.in/jwt-decoder/