Query string parsing in Express - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to access the query parameter named 'name' from the request.

Express

app.get('/hello', (req, res) => {
  const name = req.query.[1];
  res.send(`Hello, ${name}!`);
});

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

Aquery

Bparams

Cbody

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using req.params instead of req.query

Trying to access req.body for query parameters

The query parameters are accessed via req.query. To get the value of the 'name' parameter, use req.query.name.

2fill in blank

medium

Complete the code to send back the value of the 'age' query parameter as a number.

Express

app.get('/age', (req, res) => {
  const age = Number(req.query.[1]);
  res.send(`Your age is ${age}`);
});

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

Ayears

Bage

CuserAge

DageParam

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong parameter name

Not converting the string to a number

The query parameter is named 'age', so use req.query.age. Wrapping it with Number() converts the string to a number.

3fill in blank

hard

Fix the error in accessing the 'search' query parameter correctly.

Express

app.get('/search', (req, res) => {
  const term = req.[1].search;
  res.send(`Searching for: ${term}`);
});

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

Aquery

Bbody

Cparams

Dheaders

Attempts:

3 left

💡 Hint

Common Mistakes

Using req.params instead of req.query

Trying to get query parameters from req.body

Query parameters are accessed via req.query. Using req.params or others will not get query string values.

4fill in blank

hard

Fill both blanks to parse 'page' and 'limit' query parameters as numbers.

Express

app.get('/items', (req, res) => {
  const page = Number(req.query.[1]);
  const limit = Number(req.query.[2]);
  res.send(`Page: ${page}, Limit: ${limit}`);
});

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

Apage

Blimit

Ccount

Dsize

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong parameter names

Not converting to numbers

The query parameters are named 'page' and 'limit'. Use req.query.page and req.query.limit and convert them to numbers.

5fill in blank

hard

Fill all three blanks to parse 'sort', 'order', and 'filter' query parameters and send a summary.

Express

app.get('/data', (req, res) => {
  const sort = req.query.[1];
  const order = req.query.[2];
  const filter = req.query.[3];
  res.send(`Sort by: ${sort}, Order: ${order}, Filter: ${filter}`);
});

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

Asort

Border

Cfilter

Dtype

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect parameter names

Mixing parameter names with other properties

Use the exact query parameter names: 'sort', 'order', and 'filter' to access their values from req.query.