AVA vs Jest
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
Open source · MIT
A test runner for Node.js with a concise API and detailed error output.
Open source · MIT
A JavaScript testing framework that runs test files and checks results, with a watch mode and snapshots.
The short answer
Choose AVA if you need…
- Node.js developers who want a small, straightforward test runner
- Projects that use ES modules, which the README says the documentation assumes
- Teams running tests in CI who want automatic splitting of test files across parallel builds
- Developers who want built-in TypeScript definitions and async or Promise test support
Choose Jest if you need…
- JavaScript or TypeScript developers who want a testing setup that works with little configuration
- Teams adding automated tests to an existing Node-based or front-end project
- People who want to check how large objects or outputs change over time with snapshots
- Developers who want fast feedback while editing code via watch mode
Side-by-side
| AVA | Jest | |
|---|---|---|
| Type | Dev tool | Library |
| Price | Free and open source | Free and open source |
| Licence | MIT | MIT |
| GitHub stars | 20.8k | 45.5k |
| Setup difficulty | Beginner | Beginner |
| How you get it | Install with a package manager | Install with a package manager |
| Main language | JavaScript | TypeScript |
| Last code update | 5 days ago | 4 days ago |
What each one is
AVA
AVA is a testing tool for JavaScript code that runs on Node.js. You write small test functions, run one command, and it reports which checks passed or failed, with clear diffs showing the difference between expected and actual values. Its README highlights running tests concurrently and giving each test file its own isolated environment.
Jest
Jest is a testing tool for JavaScript code. You write small test files that call functions and check the results against expected values, and Jest runs them and reports which pass or fail. Its watch mode re-runs only the tests related to files you changed, and its snapshot feature saves a copy of large outputs so you can see when they change.
Best for
AVA
- Node.js developers who want a small, straightforward test runner
- Projects that use ES modules, which the README says the documentation assumes
- Teams running tests in CI who want automatic splitting of test files across parallel builds
- Developers who want built-in TypeScript definitions and async or Promise test support
Jest
- JavaScript or TypeScript developers who want a testing setup that works with little configuration
- Teams adding automated tests to an existing Node-based or front-end project
- People who want to check how large objects or outputs change over time with snapshots
- Developers who want fast feedback while editing code via watch mode
Strengths
AVA
- The README describes a concise API with detailed, syntax-highlighted diffs on failure
- Tests run concurrently and each test file gets an isolated environment
- Includes TypeScript definitions and a TAP reporter
Jest
- The README describes it as working out of the box for most JavaScript projects
- Watch mode runs only tests related to changed files, giving quick feedback
- Snapshot testing and a generated basic configuration file reduce setup effort
Not ideal for
AVA
- People who need a browser-only testing tool; the README lists browser testing only as a recipe, not a core feature
- Projects that must run AVA globally, since the README says AVA cannot be run globally and must be installed locally
- Anyone on an unsupported Node.js version, since AVA only supports the latest release of each Node.js major version that Node.js itself supports
Jest
- People who do not write or maintain JavaScript code, since it is a developer tool for testing code
- Projects that need full browser end-to-end testing, because the README describes Jest as a unit-style test runner and does not mention browser automation
- Anyone who wants Babel-free TypeScript type checking in tests, since the README says Babel-based TypeScript support does not type-check tests and suggests ts-jest or tsc instead
Trade-offs
AVA
- Must be installed locally in each project; it cannot be run globally
- Documentation assumes ES modules, which may need adjustment for older CommonJS projects
- The README is truncated here, so some details of configuration and advanced features are not covered in this entry
Jest
- TypeScript support through Babel does not type-check tests, so extra tools are needed for that
- The README says Vite support is not full and points to a third-party plugin with limitations
- Setup for some bundlers and TypeScript requires extra packages and configuration
Getting started
AVA
Set up AVA in a project (recommended)
npm init avaInstall manually with npm
npm install --save-dev avaJest
Install with npm (dev dependency)
npm install --save-dev jestInstall with yarn (dev dependency)
yarn add --dev jestFrequently asked questions
What is the difference between AVA and Jest?
AVA: A test runner for Node.js with a concise API and detailed error output. Jest: A JavaScript testing framework that runs test files and checks results, with a watch mode and snapshots. AVA suits node.js developers who want a small, straightforward test runner, while Jest suits javascript or typescript developers who want a testing setup that works with little configuration.
Are AVA and Jest free?
AVA: Free and open source. Jest: Free and open source.
Is AVA or Jest more popular?
Jest has more GitHub stars (45.5k) than AVA (20.8k). Popularity isn't the same as fit — check which one matches your use case above.
What are other alternatives to AVA and Jest?
Other options people compare them with include Mocha, Vitest, Cypress, ReactPlayer.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.