Projects and references/Testing, crawling and performance

web-vitals

A small library for measuring Core Web Vitals and attribution data from real storefront sessions.

Open-source projectStableReviewed 2026-07-25

How the Fieldbook uses it

We refer to web-vitals in work involving testing, crawling and performance. Its own documentation remains the authority for installation, compatibility, and current behavior. A listing here does not imply endorsement by its maintainers.

Good fit for

Real-user performance measurement
Diagnosing LCP, INP, and CLS regressions

Core Web VitalsRUMPerformance

Before you adopt it

Maintainer: Google Chrome team and contributors
License or usage boundary: Apache-2.0

Check the official source for the current release, support policy, compatibility notes, and license terms. The review date on this page only records when Beseam last checked the listing.

problem · stable

Checkout fails for only some visitors

Narrow a partial purchase failure by browser, device, market, consent state, payment method, and funnel step.

Open workflow

skill · stable

Purchase-friction triage

Reproduce an intermittent storefront failure and narrow it to a browser, state, component, service, or configuration.