Jeba Prince
← Writing
3 min readSecurity, Frontend, Developer Tools

Secure Your Frontend with npm audit

Known vulnerabilities in your dependencies can expose your app to real harm. How to run npm audit, read the report, fix what's fixable, handle the rest by hand, and gate CI on high and critical issues.

Modern frontend applications rely heavily on open-source packages. That convenience comes with a security cost: known vulnerabilities in your dependencies can expose your app to data loss, service disruption, or even unauthorized access. The good news: npm provides a built-in tool to detect and help fix those issues — npm audit.

What is npm audit?

npm audit is a command that analyzes your project's dependencies for known security vulnerabilities. It compares the packages defined in your package.json and package-lock.json against npm's vulnerability database to generate a report showing:

  • the vulnerable packages in your project,
  • the severity levels (low, moderate, high, critical),
  • suggested remediation steps, if fixes are available.

By default, npm also runs this audit automatically during installs, but it's worth running manually as part of your development and CI workflows.

your depspackage.json · locknpm auditscan vs vuln DBreportgraded by severitynpm audit fixauto + manualSEVERITYlowmoderatehighcriticalCI fails the build
The audit loop: scan your dependency tree against npm's vuln database, get a severity-graded report, fix what's auto-fixable, handle the rest by hand — and fail CI on high and critical.

How to run a security audit on your frontend project

1. Navigate to your project root. Make sure you're in the folder containing your package.json and package-lock.json.

cd /path/to/your/project

2. Run the audit.

npm audit

This outputs a summary of all vulnerabilities found in your dependency tree, including transitive ones.

3. Review the report. It lists packages, severity, and the paths showing how vulnerable modules get into your project. Severe and critical items should be prioritized first.

4. Attempt automatic fixes.

npm audit fix

This tries to update vulnerable packages to patched versions where possible. It modifies both package-lock.json and your local dependency tree.

5. Manual remediation. Not all vulnerabilities can be fixed automatically. You may need to:

  • update specific packages manually (npm install <pkg>@latest),
  • replace abandoned or insecure dependencies,
  • evaluate breaking changes before upgrading major versions,
  • investigate transitive dependencies that aren't directly in your package.json.

6. Integrate it in CI/CD. Use npm audit in build pipelines and fail builds on high/critical vulnerabilities with flags like --audit-level=high.

How npm audit helps fix vulnerabilities

  • Visibility into risk. You can't fix what you don't know about. npm audit surfaces vulnerabilities you might never catch manually, especially deep in the dependency graph.
  • Actionable remediation. The report doesn't just list problems; it often suggests and applies fixes with npm audit fix. That reduces time spent chasing down vulnerable packages.
  • Prioritization by severity. Not all issues are equal. By highlighting severity levels, you can focus first on the vulnerabilities that pose the greatest risk to your users and systems.
  • Proactive defense. Running audits regularly as part of development and CI means you catch new vulnerabilities quickly and avoid shipping risky builds to production.