# JWT

A signed token carrying who the user is and when it expires.

## What is **JWT**?

A **JWT** (JSON Web Token) is a signed token with three parts (header, claims, signature) separated by dots. The claims say who the user is and when the token expires; the signature proves nobody changed them.

```json
{ "sub": "c6f1...", "email": "ana@example.com", "role": "Admin", "exp": 1790000000 }
```

Level: Journeyman · [More Web Development terms at this level](https://www.ask-codey.com/glossary/subjects/web-development/journeyman)

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/jwt