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mobxjs/mobx

📈 Trending★ 28,183TypeScriptAudience · developerComplexity · 2/5ActiveLicenseSetup · easy

TLDR

Automatic state management for JavaScript apps that tracks which UI parts depend on which data, so only affected components re-render when state changes.

Mindmap

mindmap
  root((MobX))
    What it does
      Tracks state changes
      Auto re-renders UI
      Reactive programming
    How it works
      makeAutoObservable
      observer wrapper
      Runtime tracking
    Use cases
      React apps
      Complex state
      Interconnected data
    Tech stack
      TypeScript
      JavaScript
      UI frameworks
    Benefits
      Less boilerplate
      Fewer mistakes
      Optimal rendering

Things people build with this

USE CASE 1

Build React apps with complex interconnected state that updates automatically without manual wiring.

USE CASE 2

Manage application data separately from UI components for easier testing and reusability.

USE CASE 3

Reduce boilerplate code by letting MobX automatically track which components depend on which data.

USE CASE 4

Create responsive UIs where only the components using changed data re-render, improving performance.

Tech stack

TypeScriptJavaScriptReact

Getting it running

Difficulty · easy Time to first run · 5min
Use freely for any purpose, including commercial use, as long as you keep the copyright notice and license text.

In plain English

MobX is a library for what programmers call state management. In a web or app interface, state is just all the data the screen is showing at any moment: the items in a shopping cart, whether a menu is open, the seconds on a running timer. Keeping that data in sync with what the user sees on screen is a constant chore. MobX takes the position that anything which can be calculated from existing data should be recalculated automatically, so you do not have to wire it up by hand. The way it works is reactive programming. You mark some pieces of your data as observable, meaning MobX should watch them. You write your interface as functions that read from that data. MobX then quietly records which pieces of data each function actually touched. When you later change one of those pieces using ordinary assignment, MobX knows exactly which parts of the screen depend on it and re-runs only those, leaving everything else alone. The README emphasises three points: you write minimalistic code without ceremony around updates, optimal rendering is automatic so you do not need to manually memoise components, and the library is unopinionated about which UI framework you use, so the same store logic can be tested in isolation. Developers reach for MobX when their interface has a lot of derived data and they want updates to feel automatic instead of stitched together by hand. It pairs naturally with React but does not require it. The codebase is written in TypeScript and published on npm as the mobx package, with a companion mobx-react-lite binding shown in the README. The full README is longer than what was provided.

Copy-paste prompts

Prompt 1
Show me how to set up MobX state management in a React app using makeAutoObservable and observer.
Prompt 2
How do I migrate from Redux or Context API to MobX for managing my app's state?
Prompt 3
Create a simple MobX store for a shopping cart that tracks items and automatically updates the UI when items are added or removed.
Prompt 4
Explain the difference between MobX and other state management libraries like Redux or Zustand.
Prompt 5
How do I test MobX stores and components that use the observer wrapper?
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Generated 2026-05-21 · Model: sonnet-4-6 · Verify against the repo before relying on details.