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What is StackBlitz WebContainers?

StackBlitz WebContainers provide a groundbreaking client-side runtime that runs Node.js, package managers, and full-stack frameworks directly inside the browser. They eliminate the need for remote development servers by using the user's local CPU and memory for compute, delivering unmatched performance, security, and scalability. Through the WebContainer API, developers can boot an isolated environment, mount project files, install dependencies, and execute dev scripts exactly as they would on a local machine. This capability enables highly interactive experiences like full-stack playgrounds, live documentation, onboarding workflows, educational sandboxes, and AI-native IDEs that operate entirely in-browser. WebContainers support all major frameworks, Wasm workloads, and modern browsers including Chromium, Firefox, and Safari Technology Preview. They provide native support for npm, pnpm, and yarn, enabling realistic, production-grade workflows in disposable environments. Because execution happens on-device, teams drastically reduce infrastructure costs while delivering fast, low-latency development experiences. The API is designed for reliability, making it easy to create branded, custom editors or integrate with existing apps. Leading companies and open-source maintainers rely on WebContainers for secure, interactive environments that accelerate shipping and improve developer experience. As the backbone of StackBlitz's own platform, WebContainers are continuously refined and production-proven, offering a future-ready foundation for web-based development tools.

What is JSFiddle?

JSFiddle consists of four panels that can be arranged in a tabbed format; among these, three panels are allocated for coding inputs while the fourth displays the output: the first is dedicated to HTML, where there's no need to add the body, doctype, or head as they are generated automatically, the second is for CSS to apply styles, and the third is for JavaScript, which can also support pre-processors like SCSS. Once you've entered your code, you can click "Run" in the top menu to view the results in the output panel. Furthermore, JSFiddle allows you to customize the editor's layout, offering flexibility beyond the standard 2x2 grid, including a tabbed interface, and the individual grids can be resized to your liking. A notable feature is that when you adjust the Results panel, it conveniently shows its width, making it particularly beneficial for developers working on responsive designs and media queries. This adaptability significantly improves the overall user experience, enabling programmers to configure their workspace in alignment with their unique coding and debugging requirements. Additionally, such customization options foster a more efficient and personalized development environment.

Media

Media

Integrations Supported

HTML
JavaScript
Angular
Bolt.new
JSON
Next.js
Node.js
React
TypeScript
Visual Studio
Vue.js

Integrations Supported

HTML
JavaScript
CSS
Docsie
GitHub

API Availability

API Availability

Has API

Pricing Information

Pricing not provided
Free Version

Pricing Information

Pricing not provided

Supported Platforms

SaaS
Chromebook

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Not specified

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

StackBlitz

Date Founded

2018

Company Location

United States

Company Website

webcontainers.io

Company Facts

Organization Name

JSFiddle

Date Founded

2009

Company Website

jsfiddle.net

Categories and Features

Code Editors

Not specified

IDE

Not specified

JSON Editors

Not specified

Categories and Features

Code Collaboration

Not specified

IDE

Not specified

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