RequireJS vs. npm vs. Duo

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What is RequireJS?

RequireJS loads plain JavaScript files as well as more defined modules. It is optimized for in-browser use, including in a Web Worker, but it can be used in other JavaScript environments, like Rhino and Node. It implements the Asynchronous Module API. Using a modular script loader like RequireJS will improve the speed and quality of your code.

What is npm?

npm is the command-line interface to the npm ecosystem. It is battle-tested, surprisingly flexible, and used by hundreds of thousands of JavaScript developers every day.

What is Duo?

Duo is a next-generation package manager that blends the best ideas from Component, Browserify and Go to make organizing and writing front-end code quick and painless.

Want advice about which of these to choose?Ask the StackShare community!


Why do developers choose RequireJS?
Why do you like RequireJS?

Why do developers choose npm?
Why do you like npm?

Why do developers choose Duo?
Why do you like Duo?


What are the cons of using RequireJS?
No Cons submitted yet for RequireJS
Downsides of RequireJS?

What are the cons of using npm?
Downsides of npm?

What are the cons of using Duo?
No Cons submitted yet for Duo
Downsides of Duo?


How much does RequireJS cost?
How much does npm cost?
How much does Duo cost?


What companies use RequireJS?
1103 companies on StackShare use RequireJS
What companies use npm?
3096 companies on StackShare use npm
What companies use Duo?
3 companies on StackShare use Duo


What tools integrate with RequireJS?
3 tools on StackShare integrate with RequireJS
What tools integrate with npm?
22 tools on StackShare integrate with npm
What tools integrate with Duo?
2 tools on StackShare integrate with Duo

What are some alternatives to RequireJS, npm, and Duo?

  • Bower - A package manager for the web
  • Yarn - A new package manager for JavaScript
  • Browserify - Browser-side require() the node.js way
  • Component - Client package management for building better web applications

See all alternatives to RequireJS

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