Vitest Has a Free API You Should Know About

Vitest is a blazing-fast unit testing framework powered by Vite. It's compatible with Jest's API but runs tests 10-20x faster thanks to Vite's native ES modules and HMR.

Why Teams Switch from Jest to Vitest

A frontend team's Jest test suite took 4 minutes to run. Same tests in Vitest: 12 seconds. No config changes, no rewrites — just faster execution.

Key Features:

• Vite-Powered — Native ESM, instant transforms
• Jest Compatible — Drop-in replacement for most projects
• Watch Mode — Smart re-runs only affected tests
• TypeScript Native — No ts-jest or babel config needed
• In-Source Testing — Write tests alongside your code
• UI Dashboard — Visual test results in browser

Quick Start

npm install -D vitest

// math.test.ts
import { expect, test } from "vitest"
import { sum } from "./math"

test("adds 1 + 2 to equal 3", () => {
  expect(sum(1, 2)).toBe(3)
})

npx vitest        # Watch mode
npx vitest run    # Single run

Component Testing

import { render, screen } from "@testing-library/react"
import { test, expect } from "vitest"
import { Button } from "./Button"

test("renders button text", () => {
  render(<Button>Click me</Button>)
  expect(screen.getByText("Click me")).toBeDefined()
})

Why Choose Vitest

1. 10-20x faster than Jest out of the box
2. Zero config for Vite projects
3. Jest compatible — migrate in minutes

Check out Vitest docs to get started.

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