🎫 JWT Decoder

What is JWT Decoder?

JWT Decoder is a security and debugging tool that unpacks JSON Web Tokens. It separates the token into its Header, Payload, and Signature components, allowing developers to read the claims (like user ID and expiration time) embedded inside the token.

How to Use JWT Decoder

1. Paste your JWT string (the long string with two periods) into the tool
2. The tool will instantly parse the token
3. Review the Header and Payload sections displayed in JSON format

Why Use Our JWT Decoder?

• Instantly decode Base64-encoded JSON Web Tokens
• View the header algorithm and payload claims in clear JSON
• Check token expiration dates (exp claims) easily
• 100% private — tokens are parsed locally and never sent to a server

Common Use Cases

• Debugging authentication issues in a single-page application (SPA)
• Checking if a user's session token has expired
• Verifying that the correct user ID is embedded in a newly issued JWT

Frequently Asked Questions

• Does it verify the token signature?▾
  No, this is a client-side tool that only decodes the header and payload for inspection.