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Scale Node.js: Use Clusters to fork processes and balance network load across CPU cores. Use Worker Threads for CPU-bound tasks like image processing within a single process.

#NodeJS

Compound components share state implicitly among related children using Context. Think <Select> and <Option>. It eliminates prop drilling and creates clean, expressive APIs.

#ReactJS #MERN

Extract logic into custom hooks to decouple state and side effects from UI components. It improves testability and keeps your JSX clean and declarative.

#ReactJS #MERN

List virtualization renders only visible items in the viewport, skipping off-screen DOM nodes. Use libraries like react-window to handle 10k+ rows effortlessly without UI lag.

#ReactJS

Speed up initial load times using `React.lazy()` and `Suspense`. Lazy load non-critical components so users only download the JavaScript they actually need.

#ReactJS

A closure gives an inner function access to an outer function's scope even after the outer function returns. Use it to create private variables and encapsulate state in JS.

#JavaScript

JS objects inherit properties via a prototype chain. When reading a property, JS searches the object, then its prototype, moving up until null. Use Object.getPrototypeOf(obj) to inspect it.

#JavaScript

Validate Express request bodies before hitting controllers using Joi schemas. Call 'schema.validate(req.body)' in middleware to block bad payloads early and avoid DB errors.

#NodeJS

JWT signatures verify token integrity using a secret key. In MERN, store JWTs in HTTP-only cookies instead of localStorage to prevent XSS attacks during auth.

#MERNstack

Mongoose populate() replaces document ObjectIDs with actual referenced data. For complex joins or better performance, use MongoDB $lookup in aggregation pipelines.

#MongoDB #NodeJS

Chain `.find()`, `.sort()`, `.skip()`, and `.limit()` in Mongoose for efficient API pagination and filtering. This offloads data processing directly to MongoDB.

#MERNStack #MongoDB

Use `await Model.create({ name: 'Alice' })` to write to MongoDB, and `await Model.find({ name: 'Alice' })` to read. Mongoose handles validation and casts types automatically.

#MERN #MongoDB

Mongoose schemas enforce data integrity in MongoDB. Combine types like `Number` with validators like `min` or `required` to block invalid writes at the application level.

#MongoDB #MERN

MongoDB relationships: Use embedding for fast reads on bounded data. Use references (storing `ObjectId`s) for large, unbounded data to avoid the 16MB limit and reduce duplication.

#MongoDB #MERN

Model relationships in Express using nested routes: `GET /users/:userId/posts/:postId`. This keeps your API intuitive and resource-oriented.

#ExpressJS #WebDev

Express error middleware needs 4 arguments: `(err, req, res, next)`. Omitting `next` breaks it, as Express uses parameter count (arity) to identify error handlers.

#ExpressJS #WebDev

Write custom Express middleware using `(req, res, next) => {}`. Mutate `req` to share data, and always call `next()` to prevent hanging requests.

#ExpressJS #NodeJS

Don't load huge files into memory with `fs.readFile`. Use `fs.createReadStream` to process data in chunks. It keeps your Node.js memory footprint low and constant.

#NodeJS #Backend

Node's `EventEmitter` powers async architecture. Use `emitter.on()` to register listeners and `emitter.emit()` to trigger actions. Perfect for decoupling modules in your backend.

#NodeJS #Backend

Validate React controlled inputs by checking values on change. Update an error state like `setError(validate(value))` and conditionally render the message next to the input.

#ReactJS #WebDev