Can this tool verify the signature of my JWT?

This tool decodes the token claims for inspection. Because verifying the signature requires your private signing secret or public key, we intentionally do not request or store your secret keys.

Is it safe to paste production tokens here?

Yes, because parsing happens client-side without any server API calls. However, as best practice, avoid sharing live admin tokens containing sensitive keys.

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Dev 100% Client-Side Privacy

JWT Decoder

Decode and inspect JSON Web Token headers, payloads, and expiration times safely.

JWT Decoder

Decode, verify, and inspect JSON Web Tokens instantly.

Encoded JWT

Header (Algorithm & Type)

Waiting for token input...

Payload (Data & Claims)

Waiting for token input...

Signature

Waiting for token input...

Key Features

Decode Header (Algorithm & Token Type) instantly

Inspect Payload claims (sub, iat, exp, iss, custom claims)

Human-readable token expiration time & active countdown

Detect expired or upcoming token expiration stamps

100% Client-side token parsing — zero secret leakage

How to Use the JWT Decoder

Paste your encoded JSON Web Token (JWT) into the input box.

The decoder immediately splits the three segments: Header (Red), Payload (Purple), and Signature (Cyan).

Inspect the decoded JSON claims and verify expiration dates directly in the viewer.

Examples

Decoded JWT Structure

The token splits into Header, Payload, and Signature components for transparent inspection.

Input / Scenario:

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

Output:

HEADER: {"alg": "HS256", "typ": "JWT"}
PAYLOAD: {"sub": "1234567890", "name": "John Doe", "iat": 1516239022}

What is a JSON Web Token (JWT)?

A JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. Tokens are commonly used for stateless authentication in REST and GraphQL APIs, Single Sign-On (SSO), and identity exchange.

Learn how JWTs work in our JWT Explained Guide

Security & Privacy Assurance

JWT tokens often contain sensitive claims and user identity. This tool runs exclusively inside your browser with standard Base64URL decoding. Tokens are never logged or transmitted.