Health check endpoints in Express - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a basic health check route that responds with 'OK'.

Express

app.get('/health', (req, res) => {
  res.status([1]).send('OK');
});

Drag options to blanks, or click blank then click option'

A404

B302

C500

D200

Attempts:

3 left

💡 Hint

Common Mistakes

Using 404 or 500 which indicate errors.

Forgetting to send a response.

The HTTP status code 200 means the request was successful. For a health check, this indicates the server is running fine.

2fill in blank

medium

Complete the code to add a JSON response with a status message in the health check endpoint.

Express

app.get('/health', (req, res) => {
  res.status(200).json({ status: [1] });
});

Drag options to blanks, or click blank then click option'

A'error'

B'ok'

C'fail'

D'pending'

Attempts:

3 left

💡 Hint

Common Mistakes

Using negative status messages like 'error' or 'fail'.

The health check should return a positive status like 'ok' to indicate the server is healthy.

3fill in blank

hard

Fix the error in the health check route to correctly send a JSON response.

Express

app.get('/health', (req, res) => {
  res.send([1]);
});

Drag options to blanks, or click blank then click option'

A{ status: 'ok' }

B'OK'

C200

Dres.status(200)

Attempts:

3 left

💡 Hint

Common Mistakes

Sending a string instead of an object.

Passing a number or status code directly to send.

To send JSON, pass an object like { status: 'ok' } to res.send(). Sending a string like 'OK' sends plain text, not JSON.

4fill in blank

hard

Fill both blanks to create a health check endpoint that responds with status 200 and JSON { status: 'healthy' }.

Express

app.get('/health', (req, res) => {
  res.status([1]).json({ status: [2] });
});

Drag options to blanks, or click blank then click option'

A200

B'healthy'

C'ok'

D500

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong status codes like 500.

Using 'ok' instead of 'healthy' for the status message.

The status code 200 means success, and the JSON response should have status 'healthy' as requested.

5fill in blank

hard

Fill all three blanks to create a health check endpoint that responds with status 200, JSON { status: 'ok' }, and logs 'Health check passed' to the console.

Express

app.get('/health', (req, res) => {
  console.log([1]);
  res.status([2]).json({ status: [3] });
});

Drag options to blanks, or click blank then click option'

A'Health check passed'

B200

C'ok'

D'Server running'

Attempts:

3 left

💡 Hint

Common Mistakes

Logging wrong messages.

Using incorrect status codes or JSON values.

Logging 'Health check passed' helps monitor the endpoint. The status code 200 and JSON { status: 'ok' } indicate success.