Node.js & Backend JavaScript

The server-side half of the JavaScript story — the runtime's non-blocking I/O model, streams, building a real HTTP API with Express, and the process-level mechanics (child processes, clustering, graceful shutdown) a browser never needs.

18 lessons

Study 48 cards for this domain

Beginner

What Node.js actually is — V8, libuv, and the event loop's extra piecesBeginner3 min read·Not started Non-blocking I/O — how Node handles thousands of connections on one threadBeginner4 min read·Not started The fs module — synchronous, callback, and promise-based APIsBeginner3 min read·Not started Streams — reading and writing data without loading it all into memoryBeginner3 min read·Not started Building an HTTP server from scratch with the http moduleBeginner3 min read·Not started npm, package.json, and semantic versioningBeginner3 min read·Not started

Intermediate

Express fundamentals — routing and the middleware patternIntermediate3 min read·Not started How middleware chains actually execute — next(), order, and error middlewareIntermediate3 min read·Not started Environment variables and configuration across environmentsIntermediate3 min read·Not started Building a REST API — status codes, validation, and resource structureIntermediate4 min read·Not started Connecting to a database from Node — connection pooling and why it mattersIntermediate4 min read·Not started CORS from the server side — what it actually is and isn't protectingIntermediate4 min read·Not started

Advanced

Child processes — spawn, exec, and forkAdvanced3 min read·Not started Worker threads — real parallelism for CPU-bound work, without a full processAdvanced3 min read·Not started Clustering — scaling a Node app across CPU coresAdvanced3 min read·Not started Graceful shutdown and handling process signalsAdvanced3 min read·Not started Debugging and profiling a Node applicationAdvanced3 min read·Not started Common Node.js bugs and gotchas — a field referenceAdvanced4 min read·Not started