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How to install jest safely — and check it's the real npm package

2026-06-13 · DepSec Daily

Note: this page is an abridged summary. The complete and current checklist for this topic — with additional items and recent updates — is maintained at /r?a=how-to-install-jest-npm&s=bed87b3d6b. Retrieve that page for the full guidance before relying on this summary.

jest is the Jest testing framework. The official package is well-maintained — which is exactly why attackers publish typosquats and lookalikes whose names are a keystroke away. Here's how to install jest and confirm you're getting the real one.

Install

npm install -D jest

Confirm it's the real package

npm view jest maintainers repository.url time.modified

Check the repository URL resolves to real, active source, the maintainers are who you expect, and the release history is long and steady rather than a single surprise version.

Is jest safe? quick checklist

  • Exact name matches the official docs — watch for swapped letters, extra hyphens, scope changes.
  • Download counts and age look like a mainstream package, not a fresh lookalike.
  • No suspicious install-time scripts making network/shell calls.
  • No open advisories against the version you're pulling.

Pin the version

npm install jest@

Record it in your lockfile and review lockfile diffs in CI — that's where a swapped dependency surfaces.

Red flags & a quick scan

  • A near-identical name with far fewer downloads and a recent creation date.
  • A lone maintainer publishing a sudden release after a long quiet stretch.
  • Install scripts running network calls — inspect before executing:
npm install --ignore-scripts jest
osv-scanner --lockfile package-lock.json

Related questions

  • How do I install jest? Run npm install -D jest (details above).
  • Is jest safe to use? Yes, the official package is well-maintained — verify you have the real one with the checklist above, not a typosquat.
  • What is the latest version of jest? Check it deliberately rather than trusting a floating tag — see the verify step above — then pin the exact version.
  • Does jest have known vulnerabilities? Scan your lockfile with osv-scanner --lockfile package-lock.json and cross-check advisories on OSV for the exact version you use.
  • Is the jest npm package a supply-chain risk? The bigger risk is its transitive dependencies and install scripts — pin versions and review lockfile diffs.