# Jest vs Vitest

**Leader by Vioscale score:** Jest

| Attribute | Jest | Vitest |
|---|---|---|
| **Vioscale score** | 79.5 (71% (medium)) | 73.6 (78% (high)) |
| activity.commits_last_30d | 92 | 100 |
| adoption.dependent_repos | 2,802,343 | 30,558 |
| adoption.github_stars | 45,474 | 17,012 |
| adoption.package_downloads_weekly | 47,303,993 | 96,385,267 |
| adoption.stackoverflow_questions | 44,000 | 1,200 |
| content.faq | `[{"answer":"Jest is a testing framework for JavaScript projects that provides tools for writing and running unit tests. It is designed for developers building applications with JavaScript, TypeScript, React, Angular, Vue, and Node.js, and emphasizes minimal configuration while offering extensive built-in testing capabilities.","source":"https://jestjs.io","question":"What is Jest and who should use it?","confidence":0.95},{"answer":"Yes, Jest is open-source and free to use under an open-source license, maintained by the OpenJS Foundation and its community contributors. There is no commercial licensing model, paid tier, or associated costs for using Jest.","source":"https://jestjs.io","question":"Is Jest open-source and free to use?","confidence":0.95},{"answer":"Jest can be installed as a development dependency using npm, yarn, pnpm, or bun by running a single install command. After installation, you add a test script to your package.json, create test files alongside your source code, and run tests immediately with minimal or no configuration required.","source":"https://jestjs.io/docs/getting-started","question":"How do I install and get started with Jest?","confidence":0.95},{"answer":"Snapshot testing captures the output of a component or function and stores it in a reference file, then compares future test runs against that snapshot to detect unintended changes. This is particularly useful for testing React components, API responses, and other complex serialized values where checking exact output structure is important.","source":"https://jestjs.io/docs/snapshot-testing","question":"What does Jest's snapshot testing feature do?","confidence":0.95},{"answer":"Mock functions let you replace real function implementations with test versions that capture how they were called, what arguments they received, and what they returned. This enables isolation testing and verification of interactions between code units without depending on external implementations.","source":"https://jestjs.io/docs/mock-functions","question":"What are mock functions in Jest and why use them?","confidence":0.95},{"answer":"Yes, Jest includes built-in code coverage reporting that can be enabled with the --coverage flag, which generates coverage reports without requiring additional setup or external tools. You can configure coverage collection to target specific files, specify coverage thresholds, and choose between different coverage providers.","source":"https://jestjs.io/docs/cli","question":"Does Jest provide built-in code coverage reporting?","confidence":0.92},{"answer":"Jest supports TypeScript through ts-jest or Babel setup, and integrates with popular frameworks including React, Angular, Vue, and Node.js. The framework is flexible and extensible, allowing configuration for different transpilers and module systems including webpack and CommonJS environments.","source":"https://jestjs.io/docs/getting-started","question":"Can Jest work with TypeScript and other JavaScript frameworks?","confidence":0.93},{"answer":"Jest emphasizes zero-configuration setup, parallel test execution for speed, built-in snapshot testing, comprehensive mocking and assertion APIs, clear error messages, and code coverage out-of-the-box. These features make it production-ready without requiring a complex learning curve or setup for typical JavaScript projects.","source":"https://jestjs.io","question":"What are Jest's core strengths as a testing framework?","confidence":0.9}]` | `[{"answer":"Vitest is a testing framework designed specifically for projects built with Vite. It reuses Vite's configuration and build plugins, eliminating duplicate setup when your application and tests share the same build pipeline. Developers using Vite benefit from streamlined testing without configuration overhead, though Vitest also works with projects that don't use Vite.","source":"https://vitest.dev","question":"What is Vitest and who should use it?","confidence":0.95},{"answer":"Yes, Vitest natively supports ESM, TypeScript, and JSX without requiring additional configuration or build steps. The framework automatically recognizes these modern JavaScript features through its integration with Vite's transformation pipeline, reducing setup complexity for developers working with contemporary toolchains.","source":"https://vitest.dev","question":"Does Vitest support TypeScript, JSX, and modern JavaScript out of the box?","confidence":0.95},{"answer":"Vitest's watch mode intelligently reruns only the tests affected by changes in your code, similar to how Vite's Hot Module Reload works for development. This approach is faster than manually filtering tests or waiting for full test suite reruns after each edit, improving developer experience during development cycles.","source":"https://vitest.dev","question":"How does Vitest's watch mode differ from other test runners?","confidence":0.92},{"answer":"Yes, Vitest includes a browser mode that executes tests in real browsers using Playwright (supporting Chromium, Firefox, and WebKit) or WebdriverIO (supporting Chrome, Firefox, Edge, and Safari). This enables genuine DOM interaction testing, component testing, and visual regression detection rather than relying on DOM simulation.","source":"https://vitest.dev/guide/browser.html","question":"Can I run tests in actual browsers with Vitest?","confidence":0.93},{"answer":"Vitest provides API compatibility with Jest, including support for `expect()` assertions, snapshot testing, and mocking. This makes it a potential drop-in replacement for Jest projects, though Vitest is optimized for Vite-based applications and may require configuration adjustments if your project uses other build systems.","source":"https://vitest.dev/guide/comparisons.html","question":"Is Vitest compatible with Jest, and can I migrate from Jest?","confidence":0.91},{"answer":"Vitest supports two coverage providers: V8 (native, faster, lower memory usage) and Istanbul (works with any JavaScript runtime but slower). Both providers generate multiple report formats including HTML, text summaries, and LCOV, and allow filtering which files to include or exclude from coverage calculations.","source":"https://vitest.dev/guide/coverage.html","question":"What code coverage options does Vitest provide?","confidence":0.93},{"answer":"Vitest requires Node.js version 20 or later and Vite version 6 or later. It can be installed and run through common package managers including npm, yarn, pnpm, and bun, making it accessible to most JavaScript development environments.","source":"https://vitest.dev/guide/","question":"What are Vitest's system requirements and minimum dependencies?","confidence":0.94},{"answer":"Yes, Vitest is completely free and open-source, maintained by a community of contributors with support from corporate sponsors. There is no licensing cost, commercial licensing model, or requirement to pay for core features or basic usage.","source":"https://vitest.dev","question":"Is Vitest free and open-source?","confidence":0.94}]` |
| description.long | A testing tool for JavaScript projects that provides assertions, mocking, snapshot testing, and code coverage analysis with parallel test execution and zero-configuration defaults. | Vitest is a test runner built on Vite that understands your Vite configuration and reuses its build pipelines. It's Jest-compatible, supports TypeScript and JSX out of the box, and works for both frontend and backend code. |
| features.capabilities | `{"mocking":true,"coverage":true,"languages":"JavaScript, TypeScript","assertions":true,"watch_mode":true,"ci_integration":true,"snapshot_testing":true,"browser_automation":false,"parallel_execution":true}` | `{"coverage":true,"languages":"TypeScript, JSX","assertions":true,"watch_mode":true,"snapshot_testing":true}` |
| integrations.count | 6 | 2 |
| integrations.list | `[{"name":"React"},{"name":"Angular"},{"name":"Vue"},{"name":"TypeScript"},{"name":"Babel"},{"name":"Node"}]` | `[{"name":"Vite"},{"name":"Jest"}]` |
| language.primary | TypeScript | TypeScript |
| license.spdx | MIT | MIT |
| market.availability | `{"source":"https://jestjs.io","hqCountry":"US","confidence":0.95,"primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"source":"https://vitest.dev","hqCountry":"US","confidence":0.9,"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"cli":true,"web":true}` | `{"cli":true}` |
| pricing | `{"type":"open_source","summary":"Free and open source","freeTier":true,"sourceUrl":"https://jestjs.io","retrievedAt":"2026-08-14T11:04:15.584Z"}` | `{"type":"open_source","summary":"Free and open source","freeTier":true,"sourceUrl":"https://vitest.dev","retrievedAt":"2026-08-14T11:06:21.578Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | commercial | open_source |
| pricing.price_level | free | free |
| pricing.transparent | - | yes |
| release.cadence_days | 17 | 5 |
| release.history | `[{"url":"https://github.com/jestjs/jest/releases/tag/v30.4.2","date":"2026-05-09T00:32:04Z","type":"stable","version":"v30.4.2"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.4.1","date":"2026-05-08T08:42:32Z","type":"stable","version":"v30.4.1"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.4.0","date":"2026-05-07T18:47:24Z","type":"stable","version":"v30.4.0"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.3.0","date":"2026-03-10T02:01:31Z","type":"stable","version":"v30.3.0"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.2.0","date":"2025-09-28T07:33:58Z","type":"stable","version":"v30.2.0"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.1.3","date":"2025-09-03T07:49:01Z","type":"stable","version":"v30.1.3"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.1.2","date":"2025-09-03T07:48:42Z","type":"stable","version":"v30.1.2"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.1.1","date":"2025-08-27T13:44:47Z","type":"stable","version":"v30.1.1"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.1.0","date":"2025-08-27T04:53:13Z","type":"stable","version":"v30.1.0"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.0.2","date":"2025-06-19T11:01:23Z","type":"stable","version":"v30.0.2"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.0.1","date":"2025-06-18T23:36:13Z","type":"stable","version":"v30.0.1"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.0.0","date":"2025-06-10T02:23:20Z","type":"stable","version":"v30.0.0"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.0.0-beta.4","date":"2025-05-27T07:05:50Z","type":"prerelease","version":"v30.0.0-beta.4"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.0.0-beta.3","date":"2025-05-27T03:34:40Z","type":"prerelease","version":"v30.0.0-beta.3"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.0.0-alpha.7","date":"2025-01-30T08:33:37Z","type":"prerelease","version":"v30.0.0-alpha.7"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.0.0-alpha.6","date":"2024-08-08T07:46:22Z","type":"prerelease","version":"v30.0.0-alpha.6"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.0.0-alpha.5","date":"2024-05-30T12:47:54Z","type":"prerelease","version":"v30.0.0-alpha.5"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.0.0-alpha.4","date":"2024-05-12T21:48:31Z","type":"prerelease","version":"v30.0.0-alpha.4"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.0.0-alpha.3","date":"2024-02-20T11:20:28Z","type":"prerelease","version":"v30.0.0-alpha.3"},{"url":"https://github.com/jestjs/jest/releases/tag/v30.0.0-alpha.2","date":"2023-11-16T09:33:06Z","type":"prerelease","version":"v30.0.0-alpha.2"}]` | `[{"url":"https://github.com/vitest-dev/vitest/releases/tag/v4.1.11","date":"2026-08-18T14:21:05Z","type":"stable","version":"v4.1.11"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-rc.2","date":"2026-08-17T13:23:20Z","type":"prerelease","version":"v5.0.0-rc.2"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-rc.1","date":"2026-08-11T23:41:46Z","type":"prerelease","version":"v5.0.0-rc.1"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-beta.7","date":"2026-07-24T11:40:54Z","type":"prerelease","version":"v5.0.0-beta.7"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-beta.6","date":"2026-07-06T06:52:52Z","type":"prerelease","version":"v5.0.0-beta.6"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v4.1.10","date":"2026-07-06T06:41:38Z","type":"stable","version":"v4.1.10"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v3.2.7","date":"2026-07-06T06:35:34Z","type":"stable","version":"v3.2.7"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-beta.5","date":"2026-06-15T08:49:24Z","type":"prerelease","version":"v5.0.0-beta.5"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v4.1.9","date":"2026-06-16T06:13:58Z","type":"stable","version":"v4.1.9"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-beta.4","date":"2026-06-01T08:40:54Z","type":"prerelease","version":"v5.0.0-beta.4"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v4.1.8","date":"2026-06-01T08:15:20Z","type":"stable","version":"v4.1.8"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v3.2.6","date":"2026-06-01T09:39:20Z","type":"stable","version":"v3.2.6"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v3.2.5","date":"2026-06-01T08:35:18Z","type":"stable","version":"v3.2.5"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-beta.3","date":"2026-05-19T07:53:46Z","type":"prerelease","version":"v5.0.0-beta.3"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v4.1.7","date":"2026-05-20T07:20:12Z","type":"stable","version":"v4.1.7"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v4.1.6","date":"2026-05-11T14:38:28Z","type":"stable","version":"v4.1.6"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-beta.2","date":"2026-05-05T10:42:16Z","type":"prerelease","version":"v5.0.0-beta.2"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-beta.1","date":"2026-04-23T10:30:39Z","type":"prerelease","version":"v5.0.0-beta.1"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v4.1.5","date":"2026-04-21T11:04:32Z","type":"stable","version":"v4.1.5"},{"url":"https://github.com/vitest-dev/vitest/releases/tag/v4.1.4","date":"2026-04-09T07:37:17Z","type":"stable","version":"v4.1.4"}]` |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=%40jest%2Ftypes&per_page=100","last_12m":0,"max_severity":null}` | `{"count":2,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=vitest&per_page=100","last_12m":1,"max_severity":"CRITICAL"}` |

## Capabilities (Testing Tools)

| Capability | Jest | Vitest |
|---|:--:|:--:|
| **Core** |  |  |
| Test types | - | - |
| Browser automation | ✗ | - |
| Built-in assertion library | ✓ | ✓ |
| Languages | JavaScript, TypeScript | TypeScript, JSX |
| **Isolation** |  |  |
| Mocking / stubbing | ✓ | - |
| **Techniques** |  |  |
| Snapshot testing | ✓ | ✓ |
| **Performance** |  |  |
| Parallel execution | ✓ | - |
| **Insight** |  |  |
| Code coverage | ✓ | ✓ |
| **DX** |  |  |
| Watch mode | ✓ | ✓ |
| **Ops** |  |  |
| CI integration | ✓ | - |

*Source: Vioscale. Generated 2026-09-01T17:21:16.737Z. "-" = undocumented, not absent.*