Node.js › Advanced Node.js

How does Node.js's built-in test runner (node:test) compare to third-party frameworks like Jest or Mocha?

Advanced

Answer

Node's built-in test runner (stable since Node 20, available via node:test) provides test suites, hooks (before/after), mocking, code coverage, and a TAP-compatible reporter without any external dependency -- reducing install size and avoiding version-compatibility churn. It lacks some of Jest's more advanced features out of the box (like built-in snapshot testing or extensive matcher libraries), but for many projects it's now sufficient on its own, and can be paired with assert or a lightweight assertion library.

const { test } = require('node:test');
const assert = require('node:assert');

test('adds two numbers', () => {
  assert.strictEqual(1 + 1, 2);
});

// Run with: node --test
// Or with coverage: node --test --experimental-test-coverage

Real-world example A small internal CLI tool drops its Jest dependency entirely in favor of node:test, since the project has minimal testing needs and removing Jest cuts the node_modules install size significantly and eliminates a whole category of dependency-version conflicts.

Common follow-ups: What testing features does Jest still provide that node:test currently lacks?;How would you migrate an existing Jest test suite to node:test incrementally?

Testing with Jest Mocha & the Node Test Runner;CLI Tools & Scripting with Node.js