JWT Decoder: Inspect JSON Web Tokens

Introduction

JWTs are the standard for modern authentication. They contain user data (claims) encoded in a secure string. But you can't read them with the naked eye. TekToolHub's **JWT Decoder** parses the token so you can see what's inside.

What's in a JWT?

1. **Header:** Algorithm and token type.
2. **Payload:** User data (ID, name, role, expiration).
3. **Signature:** Verifies the token hasn't been tampered with.

Security Warning

**Never paste production tokens with sensitive secrets into online tools.** While our tool processes tokens **locally in your browser** and does not send them to a server, it's best practice to use test tokens or non-sensitive data for debugging.

How to Use

1. **Paste Token:** Enter your `ey...` string.
2. **View Data:** The tool splits the token and displays the decoded JSON.
3. **Check Expiry:** See human-readable expiration dates.

Debug auth issues with **JWT Decoder**.