How to use memory-stats.js in a React application?

Use the community-provided React component from the adapters list in the README. Import it into your project, add it to your component tree, and update it in an animation loop for real-time monitoring.

memory-stats.js vs Chrome DevTools memory tab: which is better?

memory-stats.js is better for real-time, in-app monitoring during active development, while Chrome DevTools offers more detailed profiling, snapshots, and timeline analysis. They complement each other for thorough debugging.

Can memory-stats.js automatically detect memory leaks?

No, it only visualizes memory usage; developers must manually interpret the data—like tracking increasing heap size over time—to identify potential leaks, as it lacks automated alerting or analysis features.

Does memory-stats.js work in Firefox or Safari?

It relies on Chrome's performance.memory API, so it may not function or provide limited data in other browsers. The README specifies Chrome flag requirements, indicating limited cross-browser support.

How to install and use the memory-stats.js bookmarklet?

Drag the bookmarklet code from the README to your browser's bookmarks bar. Click it on any webpage to inject the memory stats panel instantly, enabling quick debugging without modifying source code.

memory-stats.js or stats.js for web app performance?

memory-stats.js focuses solely on memory monitoring, while stats.js tracks FPS and MS for rendering performance. Choose based on your needs: memory-stats.js for memory insights, stats.js for broader performance metrics.

How to customize the position and style of the memory-stats.js panel?

Manually set CSS properties on stats.domElement, as shown in the usage example—like adjusting position and bottom attributes—to reposition or style the panel to fit your interface.

Open-Awesome

Memory-stats.js

JavaScript

A minimal JavaScript library for monitoring heap memory usage via performance.memory API.

GitHub

2.1k stars105 forks0 contributors

What is Memory-stats.js?

memory-stats.js is a minimal JavaScript library that monitors and visualizes heap memory usage in web applications using the browser's performance.memory API. It helps developers identify memory leaks and optimize application performance by displaying real-time memory statistics in an on-screen panel.

Target Audience

Frontend developers and web application engineers who need to monitor memory consumption during development and debugging, particularly those working on performance-sensitive applications.

Value Proposition

Developers choose memory-stats.js for its simplicity, minimal overhead, and framework-agnostic approach to memory monitoring, providing essential insights without complex setup or dependencies.

Overview

minimal monitor for JS Heap Size via performance.memory

Use Cases

Best For

Debugging memory leaks in single-page applications
Monitoring heap usage during web application development
Performance optimization of JavaScript-heavy websites
Real-time memory visualization in browser-based tools
Educational demonstrations of JavaScript memory management
Quick memory analysis via bookmarklet injection

Not Ideal For

Production environments where enabling Chrome flags is not practical or possible
Comprehensive performance monitoring requiring CPU, network, and DOM memory metrics
Server-side or Node.js applications needing memory analysis
Teams that require automated alerting and historical memory usage logs

Pros & Cons

Pros

Lightweight and Minimal

The library has no dependencies and minimal overhead, making it ideal for development without impacting app performance, as emphasized in the Key Features.

Real-time Heap Visualization

Displays current, minimum, and maximum memory usage in a compact on-screen panel, providing immediate insights into memory consumption during debugging.

Framework Integration Options

Includes community-contributed adapters for frameworks like React, Angular, and Ember, easing integration into various project types without extra setup.

Bookmarklet for Quick Debugging

Can be injected into any webpage via a bookmarklet, allowing for ad-hoc memory monitoring without code changes, as detailed in the README.

Cons

Chrome Flag Dependency

Accurate data requires Chrome to be run with --enable-precise-memory-info, limiting usability in standard browsers or environments where flags can't be enabled.

Narrow Focus on Heap Memory

Only monitors JavaScript heap memory via performance.memory API, ignoring other critical aspects like CPU usage, DOM memory, or garbage collection insights.

Lacks Advanced Features

No built-in support for logging, historical analysis, or automated leak detection, prioritizing simplicity over comprehensive monitoring tools.

Frequently Asked Questions

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