Compression middleware in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the compression middleware in a Node.js Express app.

Node.js

const express = require('express');
const compression = require('[1]');
const app = express();

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

Aexpress-compress

Bcompression

Ccompress-middleware

Dexpress-compression

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect package names like 'express-compress' or 'compress-middleware'.

Trying to import from 'express-compression' which does not exist.

The compression middleware is imported using the exact package name compression.

2fill in blank

medium

Complete the code to use compression middleware in the Express app.

Node.js

const express = require('express');
const compression = require('compression');
const app = express();

app.[1](compression());

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

AaddMiddleware

BuseCompression

Cuse

Dapply

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-existent methods like 'useCompression' or 'apply'.

Trying to call 'addMiddleware' which is not an Express method.

Express apps use app.use() to add middleware functions like compression.

3fill in blank

hard

Fix the error in the code to correctly import and use compression middleware.

Node.js

import express from 'express';
import compression from '[1]';

const app = express();
app.use(compression());

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

Aexpress-compression

Bcompress

Ccompression-middleware

Dcompression

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect package names like 'express-compression' or 'compression-middleware'.

Trying to import from 'compress' which is not the package name.

The correct package name to import is compression. Other names cause import errors.

4fill in blank

hard

Fill both blanks to create a compression middleware with a threshold of 1kb.

Node.js

const compression = require('compression');
const app = require('express')();

app.use(compression({ [1]: '[2]' }));

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

Athreshold

B1kb

CcompressionLevel

D1024

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'compressionLevel' instead of 'threshold'.

Using numeric 1024 instead of string '1kb' for threshold.

The option threshold sets the minimum size for compression. It accepts a string like '1kb'.

5fill in blank

hard

Fill all three blanks to create a compression middleware that filters responses by content type and sets a custom threshold.

Node.js

const compression = require('compression');
const app = require('express')();

app.use(compression({
  [1]: (req, res) => {
    return res.getHeader('[2]') === '[3]';
  },
  threshold: '2kb'
}));

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

Afilter

Bcontent-type

Capplication/json

Dcompress

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'compress' instead of 'filter' as option name.

Checking wrong header names or values.

The filter option is a function to decide if compression applies. Checking content-type header for 'application/json' is common.