Node.js Fundamentals · The Node Runtime · Lesson 1 of 13
What is Node.js?
Concept
What is Node.js?
Node.js lets you run JavaScript outside the browser, on servers and in command-line tools, using the same language you already know.
By the end of this lesson
- Explain the core idea behind What is Node.js?.
- Predict output before running a change.
- Test one realistic and one unusual input.
- Use the result to make the next decision.
How to study this page
- 1. Read one concept.
- 2. Change the example.
- 3. Run, compare, and explain.
- 4. Complete the challenge below.
Self-check before continuing
Without looking at the example, describe what changes when you modify one input in What is Node.js?. Then reopen the editor and prove your explanation with a small test.
You are ready to continue when you can predict, test, and explain the result.
Your turn
Log the current working directory using process.cwd().
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Console