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What is microjs.com?

gaearon/microjs.com — explained in plain English

Analysis updated 2026-07-17 · repo last pushed 2015-08-10

2JavaScriptAudience · developerComplexity · 1/5DormantSetup · easy

In one sentence

A curated directory of tiny JavaScript libraries under 5K with no dependencies, so developers can find lean alternatives to bloated frameworks.

Mindmap

mindmap
  root((repo))
    What it does
      Curates tiny libraries
      Enforces size rules
      Community submissions
    Tech stack
      JavaScript
      Build verification
    Use cases
      Find lean alternatives
      Save kilobytes
      Submit your own library
    Audience
      Web developers
      Frontend engineers
    Rules
      Under 5K compressed
      No dependencies
      Permissive license

Code map

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filefunction / class

What do people build with it?

USE CASE 1

Browse the directory to find a tiny, dependency-free library instead of pulling in a full framework.

USE CASE 2

Submit your own small library via pull request to be listed in the directory.

USE CASE 3

Use it to trim page weight for slow networks or embedded web contexts by picking minimal tools.

What is it built with?

JavaScript

How does it compare?

gaearon/microjs.com3imed-jaberi/cryptography-si-isamm3imed-jaberi/koa-isomorphic-router
Stars222
LanguageJavaScriptJavaScriptJavaScript
Last pushed2015-08-102021-09-252021-02-06
MaintenanceDormantDormantDormant
Setup difficultyeasyeasyeasy
Complexity1/51/52/5
Audiencedeveloperresearcherdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · easy Time to first run · 5min

Submissions must pass a build process that verifies size and dependency-free claims.

So what is it?

MicroJS.com is a curated directory of tiny, focused JavaScript libraries, tools that do one specific job extremely well, without bloat. Think of it as a shopping guide for developers who need a small, powerful solution rather than a massive framework. Instead of loading a 100K library when you only need 5K of functionality, you can browse here to find exactly what you need. The site works like a community-driven catalog. Someone creates a small library (say, a date formatter, animation helper, or data validator), and developers can submit it to the directory by adding an entry to a shared list. The site then displays each library with its size, purpose, and a link to download it. The catch is that libraries have to meet strict rules: they must be under 5K when compressed, have no dependencies, work without external code, and be released under a permissive open-source license. This keeps the quality high and ensures you're getting genuinely lean code, not just marketing fluff. Who would use this? Web developers building lightweight projects, mobile-first web apps, or situations where every kilobyte matters. A startup building a time-tracking widget doesn't need React or Vue, they might find a 2K date library here instead. Frontend engineers optimizing for slow networks or embedded web contexts. Or anyone who's frustrated with the complexity of modern JavaScript ecosystems and wants to understand exactly what code they're pulling in. The README doesn't detail how the site itself is built, but it emphasizes that all submissions go through a build process that verifies size claims and checks for errors. Contributions come from the community via pull requests, with libraries scattered randomly through the list to make merging easier when many people submit at once. It's a deliberately minimal, hand-curated approach, no auto-generated content, just real libraries that solve real problems in the smallest way possible.

Copy-paste prompts

Prompt 1
Help me find a microjs.com-style tiny library for date formatting that's under 5K with no dependencies.
Prompt 2
Explain the submission rules for adding a library to this directory and how the build verifies size claims.
Prompt 3
Show me how to structure a small JavaScript library so it would qualify for a microjs-style curated list.

Frequently asked questions

What is microjs.com?

A curated directory of tiny JavaScript libraries under 5K with no dependencies, so developers can find lean alternatives to bloated frameworks.

What language is microjs.com written in?

Mainly JavaScript. The stack also includes JavaScript.

Is microjs.com actively maintained?

Dormant — no commits in 2+ years (last push 2015-08-10).

How hard is microjs.com to set up?

Setup difficulty is rated easy, with roughly 5min to a first successful run.

Who is microjs.com for?

Mainly developer.

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