Web Vitals
A tiny, modular JavaScript library for measuring Core Web Vitals and other essential performance metrics on real users.
What is Web Vitals?
Web Vitals is a JavaScript library developed by the Google Chrome team for measuring essential web performance metrics on real users. It provides functions to accurately track Core Web Vitals (CLS, INP, LCP) and other metrics like FCP and TTFB, matching how Chrome measures them. It solves the problem of understanding actual user experience and diagnosing performance issues in production.
Frontend developers, performance engineers, and web analytics teams who need to measure and optimize real-user performance for their websites or web applications.
Developers choose Web Vitals because it's the official, lightweight library that guarantees measurement accuracy aligned with Google's tools (Chrome UX Report, PageSpeed Insights). Its modular design, attribution features for debugging, and flexible reporting options make it the most reliable way to collect performance data.
Overview
Essential metrics for a healthy site.
Use Cases
Best For
- Measuring Core Web Vitals (CLS, INP, LCP) in production environments
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