The answer
JavaScript fundamentals. Functions, closures, promises, async/await, and ES modules. Node.js is JavaScript, so weak fundamentals make everything harder. Master JS first.
A Roadmap to Server-Side JavaScript With Node.js
What should I learn first for server-side JavaScript?
More FAQs in A Roadmap to Server-Side JavaScript With Node.js
In order: JavaScript fundamentals, understand the server environment, build a basic HTTP server, learn Express for APIs, add MongoDB with Mongoose, implement JWT auth, build a real full-stack project, and deploy to a cloud provider.
Learn the http module first to understand how servers work, then learn Express for productivity. Express handles routing, middleware, and request parsing, but understanding what it does under the hood first makes Express more meaningful.
After you can build a basic Express API. Databases are how your API stores data, so learning them after basic API building is the natural sequence.
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