Header
Payload (Claims)
Signature
⚠️ Note: Signature verification requires the secret key
Free JWT Decoder Online
Decode and inspect JSON Web Tokens instantly
Our free JWT Decoder tool allows you to decode and inspect JSON Web Tokens (JWT) to view their header, payload, and signature components. Perfect for debugging authentication issues, understanding token structure, and validating JWT claims.
🔑 What is JWT?
JSON Web Token (JWT) is a compact, URL-safe means of representing claims between two parties. JWTs consist of three parts: Header (algorithm and token type), Payload (claims/data), and Signature (verification), separated by dots.
✨ Features
Instant Decoding
Decode JWTs in milliseconds
Structured View
See header, payload, and signature separately
Privacy First
All decoding happens in your browser
🎯 Common Use Cases
🐛 Debugging
Debug authentication issues by inspecting JWT contents
✅ Validation
Verify JWT claims and expiration times
📚 Learning
Understand JWT structure and components
🔧 Development
Test JWT generation and parsing in your applications
❓ Frequently Asked Questions
Is it safe to decode JWTs here?
Yes! All decoding happens in your browser. Your JWT never leaves your device. However, never share JWTs publicly as they may contain sensitive information.
Can this tool verify JWT signatures?
This tool decodes and displays JWT components but doesn't verify signatures, as that requires the secret key which should never be shared.
What are JWT claims?
Claims are statements about an entity (typically the user) and additional data. Common claims include 'sub' (subject), 'exp' (expiration), and 'iat' (issued at).