Node.js Fundamentals · Final Project · Lesson 13 of 13

Building and Testing the API

Concept

Building and Testing the API

Combine routing, JSON responses, and environment variables into a working server, then test each route.

By the end of this lesson

Explain the core idea behind Building and Testing the API.
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.

ExampleRunnable

const server = http.createServer((req, res) => {
  res.setHeader("Content-Type", "application/json");
  res.end(JSON.stringify({ status: "running" }));
});
server.listen(process.env.PORT || 3000);

Try it Yourself »

Self-check before continuing

Without looking at the example, describe what changes when you modify one input in Building and Testing the API. 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

Add one more route to the server above and test it locally.

Loading editor…

Console

Output will appear here...