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Express.js Basics & Routing
Test your knowledge of Express.js basics and routing in Node.js, including creating servers, routes, HTTP methods, middleware, request and response objects, route parameters, query strings, and route handlers.
- 15
- Questions
- 12 min
- Time limit
- Medium
- Difficulty
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All 15 questions and answers Spoilers: this shows the questions and answers. Try the quiz first! Open
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1. What is Express.js?
- A. A web framework for Node.js
- B. A database management system
- C. A frontend CSS framework
- D. A JavaScript testing language
Show answer
A. A web framework for Node.js
Express.js is a lightweight web application framework for Node.js commonly used to build web servers and APIs.
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2. Which command is commonly used to install Express.js in a Node.js project?
- A. npm install express
- B. npm add node-express-only
- C. node install express
- D. npm create express
Show answer
A. npm install express
The npm install express command installs Express.js as a dependency in the current Node.js project.
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3. How do you create an Express application?
- A. const app = express()
- B. const app = new ExpressServer()
- C. const app = node.express()
- D. const app = createExpressServer()
Show answer
A. const app = express()
Calling the imported express function creates an Express application instance.
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4. Which method is used to define a GET route in Express?
- A. app.get()
- B. app.fetch()
- C. app.request()
- D. app.routeGet()
Show answer
A. app.get()
The app.get() method defines a route that responds to HTTP GET requests.
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5. Which method is used to define a POST route in Express?
- A. app.post()
- B. app.send()
- C. app.create()
- D. app.submit()
Show answer
A. app.post()
The app.post() method defines a route handler for HTTP POST requests.
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6. Which object contains information about the incoming HTTP request in an Express route handler?
- A. req
- B. res
- C. app
- D. server
Show answer
A. req
The request object, commonly named req, contains information such as parameters, query strings, headers, and the request body.
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7. Which object is used to send a response back to the client?
- A. res
- B. req
- C. app
- D. router
Show answer
A. res
The response object, commonly named res, provides methods such as res.send() and res.json() for sending responses.
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8. Which Express method can be used to send a JSON response?
- A. res.json()
- B. res.object()
- C. res.data()
- D. res.sendJsonOnly()
Show answer
A. res.json()
The res.json() method sends a JSON response to the client.
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9. How can a route parameter be defined in an Express route?
- A. /users/:id
- B. /users/{id}
- C. /users/[id]
- D. /users/<id>
Show answer
A. /users/:id
Express uses a colon before a parameter name, such as /users/:id. The value can then be accessed through req.params.id.
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10. Where can you access the value of an Express route parameter?
- A. req.params
- B. req.queryParams
- C. res.params
- D. app.paramsOnly
Show answer
A. req.params
Route parameters such as :id are available through the req.params object.
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11. For the URL /products?category=books, where can the category value be accessed in Express?
- A. req.query.category
- B. req.params.category
- C. res.query.category
- D. app.query.category
Show answer
A. req.query.category
Query string values are available through req.query, so category can be accessed using req.query.category.
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12. What is Express middleware?
- A. A function that has access to the request, response, and next middleware function
- B. A database used by Express
- C. A replacement for Node.js
- D. A frontend component library
Show answer
A. A function that has access to the request, response, and next middleware function
Express middleware functions can inspect or modify requests and responses, end the request-response cycle, or pass control to the next middleware.
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13. Which function is commonly called by Express middleware to pass control to the next middleware or route handler?
- A. next()
- B. continue()
- C. forward()
- D. proceed()
Show answer
A. next()
Calling next() passes control to the next middleware function in the request processing chain.
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14. Which method can be used to mount an Express Router at a specific path?
- A. app.use()
- B. app.mountRoute()
- C. app.router()
- D. app.attach()
Show answer
A. app.use()
The app.use() method can mount middleware or an Express Router at a specified path, such as app.use('/api', router).
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15. Which HTTP method is commonly used to update an existing resource completely?
- A. PUT
- B. GET
- C. OPTIONS
- D. HEAD
Show answer
A. PUT
PUT is commonly used to replace or completely update an existing resource, while PATCH is commonly used for partial updates.