# Vitest

A fast JavaScript test runner built on Vite.

## What is **Vitest**?

A fast JavaScript test runner built on Vite.

It is compatible with Jest, and is the default test runner used by Angular.

Level: Apprentice · [More JavaScript terms at this level](https://www.ask-codey.com/glossary/subjects/javascript/apprentice)

Updated: October 16, 2026

Source: https://www.ask-codey.com/glossary/vitest-unit-testing