mswjs/msw
The industry standard for API mocking in JavaScript.
Star History
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+456
STARS · LAST 30 DAYS
15
PER DAY
#108
MOST-STARRED TypeScript
| Window | 7 days | 30 days | 90 days |
|---|---|---|---|
| Stars gained | +105 | +456 | +1.4K |
| Per day | 15 | 15 | 15 |
| Forks gained | +3 | +13 | +32 |
msw gained 456 stars in the last 30 days, about 15 a day, and now has 18.2K. It is about 8 years old and has averaged roughly 2.3K stars a year. It ranks #108 among TypeScript repositories and #562 across all languages on GitHubRepo.
Trending Record
1
DAYS ON TRENDING
#1961
BEST RANK
Sep 30, 2026
FIRST APPEARANCE
Active
STATUS TODAY
msw has maintained a continuous presence across global trending indexes, peaking at #1961. Below is the 30-day activity profile:
💡 Overview
msw is an open-source project written in TypeScript: The industry standard for API mocking in JavaScript.
Engineered for speed, consistency, and developer ease, it solves common hurdles in api, api-mocking, devtools. It provides clear interfaces, comprehensive configuration options, and seamless integration with existing tools across the modern development stack.
⚡ Key Features
Optimized execution pipeline written in TypeScript for predictable speed.
Zero-friction configuration with comprehensive sensible defaults out of the box.
Cross-platform runtime support across Linux, macOS, and Windows environments.
Strong typing and modular architecture designed for easy extension and maintainability.
Standardized CLI and API interfaces for smooth integration into CI/CD workflows.
Active community maintenance with regular dependency updates and security patches.
📥 Installation
$ npm install msw⚙ System Requirements
Platforms
- • macOS
- • Linux
- • Windows
Runtime & Dependencies
Node.js >= 18, npm, pnpm or bun
Architecture
x86_64, ARM64 (Apple Silicon & Graviton)
🧠 How It Works
msw coordinates its core functionality through a modular TypeScript pipeline. It parses configuration parameters, validates inputs, and resolves dependencies asynchronously. By minimizing runtime overhead and keeping allocations localized, it delivers predictable performance in both local development environments and automated production workloads.
🎯 Production Use Cases
Command-Line Automation
Execute automated build, deployment, and maintenance tasks directly from the terminal.
CI/CD Workflow Integration
Run non-interactive validation checks in GitHub Actions, GitLab CI, or local pre-commit hooks.
Developer Environment Setup
Standardize local engineering workstations with single-binary utility commands.
Scripting & Pipeline Orchestration
Chain complex multi-stage scripts with reliable error reporting and exits.
🚀 Getting Started
Install msw using your package manager: `npm install msw`
Initialize your project workspace or configuration file for msw.
Import msw into your codebase or invoke it directly from your terminal.
Execute your test suite or run `msw --help` to verify successful setup.
👍 Strengths
⚠️ Considerations
⇄ Alternatives & Direct Competitors
👥 Who Should Use This
Developers and engineering teams building with TypeScript, seeking reliable, tested, and actively maintained tooling for production workloads.
🏆 Nearby in the Rankings
mswjs/msw is currently ranked #562 by stars across every repository tracked on GitHubRepo. These are adjacent projects:
| Rank | Repository | Language | Stars | Action |
|---|---|---|---|---|
| #557 | NVIDIA-NeMo/Speech | Python | ★ 18.5K | Compare ↗ |
| #558 | keploy/keploy | Go | ★ 18.5K | Compare ↗ |
| #559 | plotly/plotly.js | JavaScript | ★ 18.4K | Compare ↗ |
| #560 | bluesky-social/social-app | TypeScript | ★ 18.3K | Compare ↗ |
| #560 | dotnet/runtime | C# | ★ 18.3K | Compare ↗ |
| #562 | mswjs/msw This Project | TypeScript | ★ 18.2K | |
| #563 | gastownhall/gastown | Go | ★ 18.2K | Compare ↗ |
| #564 | abseil/abseil-cpp | C++ | ★ 18.2K | Compare ↗ |
| #565 | gfx-rs/wgpu | Rust | ★ 18.1K | Compare ↗ |
| #566 | eythaann/Seelen-UI | Rust | ★ 17.9K | Compare ↗ |
| #567 | ben-manes/caffeine | Java | ★ 17.9K | Compare ↗ |
Frequently Asked Questions
What does msw do? +
The industry standard for API mocking in JavaScript.
What language is msw written in? +
The primary language is TypeScript. Topics include: api, api-mocking, devtools, mock, mock-service-worker.
Is msw actively maintained? +
Yes, the last recorded push was on Sep 30, 2026 with 12 open issues being tracked.
How many stars does msw have? +
msw has 18,234 stars and 630 forks on GitHub.
How does msw rank among GitHub repositories? +
With 18,234 stars, mswjs/msw is ranked #562 globally across all repositories tracked on GitHubRepo and #108 among TypeScript projects.
What license is msw distributed under? +
The repository reports a MIT license. Always verify the repository LICENSE file for legal terms.
