Learn Intermediate JavaScript

Bottom Line

A tight, well-structured free course that covers the JavaScript concepts most self-taught developers quietly skip—and skipping them is exactly why their code falls apart at scale.

📊 Course Snapshot

📝 Editorial Review

Here's the thing about intermediate JavaScript: it's where most self-taught developers have the biggest, quietest gaps. You can build a working to-do app. You can manipulate the DOM. But the moment someone asks you to explain hoisting, or why your async function isn't doing what you think it's doing at 10pm on a Wednesday—that's when the gaps show up. This Codecademy course is specifically designed to patch those gaps. And at free, it's hard to argue with the price of admission.

The curriculum hits the right targets. Currying, hoisting, concurrency—these are the concepts that separate developers who use JavaScript from developers who actually understand it. The async/await and Promises coverage is especially valuable here. I've seen so many learners copy-paste async patterns without understanding why they work. A course that slows down and explains the mental model? That's worth a lot more than its price tag suggests.

Classes and modules are also covered—and honestly, this is the part that makes me weirdly happy. Structuring larger web apps with proper module organization is one of those skills that doesn't show up in flashy tutorials but absolutely shows up in job interviews and real codebases. Codecademy's interactive format works well here: you're writing code, not just watching someone else write code. That matters for retention.

A few honest caveats, though. Eleven hours is lean for this much material—especially if you're someone who needs to sit with a concept before it clicks. The API and requests section may feel surface-level if you're hoping to walk away ready to build a full integration from scratch. And Codecademy's sandbox environment, while convenient, doesn't fully replicate the friction of a real development setup. You'll want to supplement with actual projects outside the platform. That's not a dealbreaker—it's just the reality of browser-based learning.

With 2,385 reviews averaging 4.4/5, students are clearly finding value. I'm not going to sugarcoat the work—intermediate JS is genuinely hard, and this course won't hold your hand through every rough patch. But it gives you a clean, structured path through concepts that most free resources scatter across a dozen half-finished blog posts. That structure is the actual product here. And it's a good one.

💼 Career & Salary Context

The skills in this course map directly to intermediate and mid-level web developer roles—and the salary data is encouraging. As of early 2026, the average intermediate web developer in the U.S. earns around $96,241/year ($46.27/hour). Broader web developer salary ranges sit between $76,000 and $130,000 depending on experience and specialization.

Relevant job titles where this course's skills apply directly:

⚠️ This course alone won't land you a job—but it fills in the intermediate-level gaps that often trip people up in technical interviews. Think of it as plugging the leaks before you apply.

⏱️ Real Time Investment

Eleven hours is the platform time—meaning the time it takes to move through exercises if everything clicks immediately. Add in re-reading confusing sections on Promises, actually running experiments outside the sandbox, and the inevitable "wait, why isn't this working" detours on async/await, and you're looking at closer to 18–22 hours for most learners. Budget a few extra evenings. The concepts here—especially concurrency and currying—are the kind that need to marinate overnight before they feel natural.

🎯 Skills You'll Build