# Token Signature

*noun*

say it: **“TOH-kun SIG-nuh-cher”** **/ˈtoʊkən ˈsɪɡnətʃər/**

The part of a signed token that proves nobody changed it, made with a secret key.

## What is **Token Signature**?

**Token Signature** — The last part of a signed token such as a JWT, made from the rest of the token and a secret key. If anyone changes a claim, the signature no longer matches, and the server refuses the token.

## In a sentence

- “Changing the role in the token broke its **signature**, so the API refused it.”

Level: Journeyman · [More Web Development terms at this level](https://www.ask-codey.com/glossary?category=web-development&level=3)

Updated: October 28, 2026

Source: https://www.ask-codey.com/glossary/token-signature