Decode JSON Web Tokens

Paste JWT, decode contents, copy & share. Made with ♥︎.

Our JWT Decoder is a free online tool that helps you decode, verify, and inspect JSON Web Tokens (JWTs). This browser-based utility securely parses JWT tokens to reveal their header, payload, and signature components in a user-friendly format.

What is JWT?

JSON Web Tokens (JWTs) are an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. JWTs are commonly used for authentication and information exchange in web development, particularly in modern API architectures.

Key Features

• Instant Decoding - Parse JWT tokens and view their contents in real-time.
• Header and Payload Display - Easily examine the token's algorithm type and claims.
• Signature Verification - Validate token authenticity to ensure it hasn't been tampered with.
• Expiration Checking - Quickly identify if tokens are expired or still valid.
• Local Processing - All decoding happens in your browser, ensuring sensitive token data never leaves your device.

Why Use a JWT Decoder?

JWT tokens have become the standard for modern authentication systems and API security. However, these tokens can be difficult to read in their encoded form. Our JWT decoder helps developers and security professionals by:

• Making encoded JWT tokens human-readable and easy to inspect
• Helping debug authentication issues by revealing token contents
• Validating token signatures to ensure they haven't been tampered with
• Checking expiration dates to troubleshoot session timeout issues

Common Uses

• API Authentication - Debug authentication issues in API calls.
• Security Testing - Inspect tokens for security vulnerabilities.
• Development - Verify token generation is working correctly.
• Session Management - Troubleshoot user session issues.
• Claims Verification - Check if tokens contain the expected user permissions and roles.