Software Development

Vitest

A Vite-native testing framework compatible with Jest for fast and integrated testing of JavaScript and TypeScript projects.

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Overview

Vitest is a next-generation testing framework built on Vite, offering fast, lightweight, and integrated testing with Jest compatibility. It supports TypeScript, JSX, ESM, component testing, and smart watch mode for efficient test runs.

Updated Oct 23, 2026

11 features

Key Features

Testing framework
A Vite-native testing framework. It's fast!
Vite config reuse
Vitest was created to make testing just work for Vite apps. By building on top of Vite, Vitest natively understands your Vite config and is able to reuse the same resolve and transform pipelines.
Vite-independent use
You can also use Vitest even if you are not using Vite. It is Jest-compatible and works for backend code too.
Jest migration
Expect, snapshot, coverage, and more - migrating from Jest is straightforward.
Watch mode
Only rerun the related changes, just like HMR for tests!
Shared configuration
Vite's config, transformers, resolvers, and plugins. Use the same setup from your app to run the tests.
Parallel processes
By default Vitest runs test files in multiple processes using node:child_process , allowing tests to run simultaneously.
Test filtering
Vitest provides many ways to narrow down the tests to run in order to speed up testing so you can focus on development.
Concurrent tests
Use .concurrent in consecutive tests to start them in parallel.
In-source testing
This makes the tests share the same closure as the implementations and able to test against private states without exporting. Meanwhile, it also brings the feedback loop closer for development.
Benchmarking
You can run benchmark tests with the bench fixture from the test context via Tinybench to compare performance results.

Pros and cons

Pros

Deep integration with Vite configuration and plugins for seamless testing experience.
Jest compatibility simplifies migration and usage for existing Jest users.
Fast and lightweight with smart watch mode reducing test run times.
Supports multiple frontend frameworks for component testing.
Free and open source with active community support.

Cons

Requires Vite >= 6.0.0 and Node >= 20.0.0, limiting compatibility with older environments.
DOM mocking environments like happy-dom or jsdom must be installed separately.
Concurrent testing requires careful use of local test context for snapshots and assertions.
Limited official support for non-Vite projects, though possible to use.
Some experimental features like benchmarking and type testing may not be stable.

Developer features

File isolation
Vitest also isolates each file's environment so env mutations in one file don't affect others. Isolation can be disabled by passing --no-isolate to the CLI (trading correctness for run performance).
Assertion compatibility
Chai is built-in for assertions with Jest expect -compatible APIs.
Mocking
Vitest provides jest-compatible APIs on vi object.
Code coverage
Vitest supports Native code coverage via v8 and instrumented code coverage via istanbul .

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See Vitest at work before you try it.

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Frequently Asked Questions

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11 features

Key Features

Testing framework
A Vite-native testing framework. It's fast!
Vite config reuse
Vitest was created to make testing just work for Vite apps. By building on top of Vite, Vitest natively understands your Vite config and is able to reuse the same resolve and transform pipelines.
Vite-independent use
You can also use Vitest even if you are not using Vite. It is Jest-compatible and works for backend code too.
Jest migration
Expect, snapshot, coverage, and more - migrating from Jest is straightforward.
Watch mode
Only rerun the related changes, just like HMR for tests!
Shared configuration
Vite's config, transformers, resolvers, and plugins. Use the same setup from your app to run the tests.
Parallel processes
By default Vitest runs test files in multiple processes using node:child_process , allowing tests to run simultaneously.
Test filtering
Vitest provides many ways to narrow down the tests to run in order to speed up testing so you can focus on development.
Concurrent tests
Use .concurrent in consecutive tests to start them in parallel.
In-source testing
This makes the tests share the same closure as the implementations and able to test against private states without exporting. Meanwhile, it also brings the feedback loop closer for development.
Benchmarking
You can run benchmark tests with the bench fixture from the test context via Tinybench to compare performance results.

Pros and cons

Pros

Deep integration with Vite configuration and plugins for seamless testing experience.
Jest compatibility simplifies migration and usage for existing Jest users.
Fast and lightweight with smart watch mode reducing test run times.
Supports multiple frontend frameworks for component testing.
Free and open source with active community support.

Cons

Requires Vite >= 6.0.0 and Node >= 20.0.0, limiting compatibility with older environments.
DOM mocking environments like happy-dom or jsdom must be installed separately.
Concurrent testing requires careful use of local test context for snapshots and assertions.
Limited official support for non-Vite projects, though possible to use.
Some experimental features like benchmarking and type testing may not be stable.

Developer features

File isolation
Vitest also isolates each file's environment so env mutations in one file don't affect others. Isolation can be disabled by passing --no-isolate to the CLI (trading correctness for run performance).
Assertion compatibility
Chai is built-in for assertions with Jest expect -compatible APIs.
Mocking
Vitest provides jest-compatible APIs on vi object.
Code coverage
Vitest supports Native code coverage via v8 and instrumented code coverage via istanbul .

You?

Be the first to rate Vitest

Your review helps others make better decisions. No account needed. Takes about 10 seconds.

Featured Video

See Vitest at work before you try it.

Watch on YouTube

0 questions

Vitest

Overview

Key Features

Testing framework

Vite config reuse

Vite-independent use

Jest migration

Watch mode

Shared configuration

Parallel processes

Test filtering

Concurrent tests

In-source testing

Benchmarking

Pros and cons

Pros

Cons

Developer features

File isolation

Assertion compatibility

Mocking

Code coverage

Be the first to rate Vitest

Featured Video

Frequently Asked Questions

Key Features

Testing framework

Vite config reuse

Vite-independent use

Jest migration

Watch mode

Shared configuration

Parallel processes

Test filtering

Concurrent tests

In-source testing

Benchmarking

Pros and cons

Pros

Cons

Developer features

File isolation

Assertion compatibility

Mocking

Code coverage

Be the first to rate Vitest

Featured Video

Frequently Asked Questions

More in Software Development

More in Software Development