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JWT Decoder

Decode and inspect JSON Web Tokens without sending them to a server

Encoded Token

What is a JWT?

JSON Web Tokens are an open, industry standard RFC 7519 method for representing claims securely between two parties.

Header: Algorithm & token type

Payload: Data (claims)

Signature: Validity check

Note: We do not validate the signature here. This tool purely decodes the base64 content.

Header

// Header will appear here

Payload

// Payload will appear here
About JWT Decoder

Debug authentication issues with our JWT Decoder. Easily paste a JSON Web Token to see its decoded Header and Payload claims. Perfect for developers working with OAuth, OpenID Connect, or custom API authentication.

🎯 Who is this tool for?

Backend DevelopersFrontend DevelopersAPI EngineersSecurity Testers

✨ Key Features

  • Decodes Header and Payload
  • Validates JWT format
  • Color-coded Structure visualization
  • One-click Copy for JSON parts
  • Sample Token loader
  • 100% Client-side (Token never leaves your browser)
  • Dark mode support

🚀 How to Use

  1. 1Paste your JWT string into the 'Encoded Token' text area.
  2. 2The tool automatically decodes it instantly.
  3. 3View the 'Header' (Algorithm/Type) and 'Payload' (Claims) in the right panels.
  4. 4Click the copy icon to copy the JSON structure if needed.
Frequently Asked Questions