# lukeed/uvu

uvu is an extremely fast and lightweight test runner for Node.js and the browser

Repository: https://github.com/lukeed/uvu
Canonical: https://ross.abutalabs.com/products/uvu
Language: JavaScript
License: MIT
License Family: permissive
Last push: 2024-08-30T16:52:27+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 2305, "days_push": 733, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3032, forks 101 (observed 2026-08-28T04:07:38.972906+00:00)

## What it is
uvu is an extremely fast and lightweight test runner for Node.js and the browser, with an optional built-in assertion library. It supports async/await, native ES Modules, individually executable test files, and snapshot testing.

## Use cases
- run unit tests for a Node.js project
- run tests in the browser
- test JavaScript ES modules
- add snapshot testing to assertions
- replace a heavyweight test runner with a fast minimal one

## When to choose
- you want a minimal, zero-dependency test runner with fast startup
- you need browser-compatible tests
- you prefer using any assertion library, including Node's native assert
- you want individually executable test files

## When to avoid
- you need built-in code coverage reporting
- you rely on advanced features like watch mode, parallel workers, or rich plugin ecosystems found in Jest or Vitest
- you need TypeScript-first tooling out of the box

## Facets
- artifact type: library
- maturity: maintenance
- function: testing, e2e-testing
- domain: testing, developer-tools
- platform: browser, cli, cross-platform
- tags: test-runner, assertions, snapshot-testing, esm, lightweight, javascript, nodejs

## Member repositories
- lukeed/uvu (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:38.972906+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:29:47.693608+00:00, confidence not recorded.
  - readme: https://github.com/lukeed/uvu (fetched 2026-08-28T04:07:38.972906+00:00, sha 0894841e7d11)
  - registry_npm: https://registry.npmjs.org/uvu (fetched 2026-08-29T09:44:54.018155+00:00, sha 8865791235d7)
- Data as of 2026-08-30T08:39:29.467469+00:00.