Showcase Your Jest Testing Skills with a GitHub README Badge

Use this markdown in your README:

![Jest](https://img.shields.io/badge/Jest-C21325?style=for-the-badge&logo=jest&logoColor=white)

The #C21325 color is Jest's official red from its branding. The jest logo identifier renders the Jest jester hat icon from Simple Icons. This badge is immediately recognizable to JavaScript developers and communicates a commitment to testing practices that many developers skip.

A Jest badge carries more weight when backed by repositories that actually have test suites. The ideal setup: pin a JavaScript or TypeScript project that has visible test coverage in its repository — a passing CI badge showing test coverage percentage, a __tests__ directory, or a test script in package.json.

In your bio or experience section, be specific about your testing approach: unit tests with mocks, integration tests against real services, snapshot testing for React components, or end-to-end test suites (Jest + Playwright or Jest + Puppeteer). Mentioning code coverage targets ('maintained >80% coverage') adds specificity that generic 'experienced with testing' statements cannot match.

Jest pairs directly with the JavaScript ecosystem it serves:

• React testing stack: Jest + React Testing Library + TypeScript
• Node.js backend testing: Jest + Supertest + TypeScript
• Full-stack testing: Jest + Playwright + Cypress (unit vs E2E split)
• Vue/Angular testing: Jest + Vue Test Utils / Angular Testing Module

For a JavaScript developer, showing both Jest (unit testing) and a browser testing tool like Cypress or Playwright communicates that you cover the full testing pyramid — a mature approach that senior engineers look for in collaborators and candidates. The combination of both types of testing tools in a profile is uncommon enough to stand out.

If your repositories have test suites, they will contribute to your JavaScript or TypeScript percentages in the top languages card. Test files themselves are a meaningful portion of well-tested codebases — a 40% test-to-code ratio is healthy and will naturally show up in your language breakdown.

Pinning a project with a README that shows a test coverage badge (from codecov.io or coveralls.io alongside your CI status) creates visual proof of your testing discipline right in the card. Many developers list Jest but have zero test files in their public repositories — the gap between claiming and demonstrating is noticed by technical reviewers.