What Is a JWT Token?

Overview

JWT Structure: Header, Payload, Signature

Common JWT Claims (exp, iat, nbf, sub, aud)

Security Considerations

When to Use JWT vs Session Cookies

Using DataSmith.io to Inspect JWTs

Open the JWT Decoder to paste and inspect real tokens in your browser.

More DataSmith developer tools

These utilities also run entirely in your browser:

• Format Converter
• SQL Generator
• Diff Checker
• Data Scrubber
• ENV Validator
• Regex Tester
• JSON Schema

For a broader overview, read Browser-first developer tools.

FAQ

What is the difference between JWT and a session cookie?

Is it safe to log JWT tokens?