Free JavaScript code quality & vulnerability checker

Scan your JavaScript code for quality and security issues, and get fix advice right in your IDE.

Try Snyk’s free JavaScript code checker. No credit card required.

Improve JavaScript code quality in real-time

Snyk’s static analysis scanner checks your JavaScript code for quality and security issues in real-time and provides fix advice in your IDE.

Fast & actionable

Analyze your JavaScript code in seconds and get actionable fix advice.


Find and fix issues in both the open source you’re using and your own code.

Accuracy powered by AI

Snyk’s AI engine has scanned 500,000+ open-source repositories to increase accuracy.

Find and fix JavaScript vulnerabilities as you develop


Integrated into your IDE

Scan your code and get fix advice in your favorite IDEs, including IntelliJ, PyCharm, and VS Code.

Real-time scan results

See results as you code, with scans 54x faster than other tools.

Fix quickly and move on

Get actionable fix advice and examples, so you can fix quickly and get back to coding.

Check your code in your IDE, Git repo, and CI/CD

Catch (and fix) JavaScript code quality and security issues at every stage.