res.download for file downloads in Express - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to send a file named 'report.pdf' for download using Express.

Express

app.get('/download', (req, res) => {
  res.[1]('report.pdf');
});

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

Adownload

Bredirect

Csend

DsendFile

Attempts:

3 left

💡 Hint

Common Mistakes

Using res.sendFile instead of res.download

Using res.redirect which is for URL redirection

The res.download() method sends a file as an HTTP attachment, prompting the user to download it.

2fill in blank

medium

Complete the code to specify a custom filename 'user_report.pdf' for the downloaded file.

Express

app.get('/download', (req, res) => {
  res.download('report.pdf', [1]);
});

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

A'download.pdf'

B'user_report.pdf'

C'file.pdf'

D'report_download.pdf'

Attempts:

3 left

💡 Hint

Common Mistakes

Using the original file path instead of a filename

Omitting quotes around the filename

The second argument to res.download() sets the filename the user sees when downloading.

3fill in blank

hard

Fix the error in the code to handle errors during file download.

Express

app.get('/download', (req, res) => {
  res.download('report.pdf', ([1]) => {
    if (err) {
      res.status(500).send('Error downloading file');
    }
  });
});

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

Aexception

Berror

Ce

Derr

Attempts:

3 left

💡 Hint

Common Mistakes

Using a parameter name different from the one checked inside the callback

Not including the error parameter at all

The callback receives an error object named err by convention to check if the download failed.

4fill in blank

hard

Fill both blanks to send 'report.pdf' for download and handle errors by sending a 404 status.

Express

app.get('/download', (req, res) => {
  res.[1]('report.pdf', ([2]) => {
    if ([2]) {
      res.status(404).send('File not found');
    }
  });
});

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

Adownload

Berr

CsendFile

Derror

Attempts:

3 left

💡 Hint

Common Mistakes

Using res.sendFile instead of res.download

Using a wrong parameter name for the error

res.download sends the file, and the callback receives err to check for errors.

5fill in blank

hard

Fill all three blanks to send 'report.pdf' for download with a custom filename 'summary.pdf' and handle errors by logging them.

Express

app.get('/download', (req, res) => {
  res.[1]('report.pdf', [2], ([3]) => {
    if ([3]) {
      console.error('Download error:', [3]);
      res.status(500).send('Download failed');
    }
  });
});

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

Adownload

B'summary.pdf'

Cerr

DsendFile

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the custom filename argument

Using wrong parameter names in the callback

Using res.sendFile instead of res.download

The res.download method takes the file path, the custom filename, and a callback with an error parameter.