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Node js tutorial step by step 14 Express Video Lecture | The Complete NodeJS Developer Course (in Hindi) - Back-End Programming
FAQs on Node js tutorial step by step 14 Express Video Lecture - The Complete NodeJS Developer Course (in Hindi) - Back-End Programming
| 1. What is Express.js? |  |
Ans. Express.js is a popular web application framework for Node.js. It provides a set of features and tools that help in building web applications and APIs. It simplifies the process of handling requests and responses, routing, and middleware integration, making it easier to develop back-end applications using Node.js.
| 2. How do you install Express.js? | |
Ans. To install Express.js, you need to have Node.js installed on your system. Once you have Node.js, you can use the npm (Node Package Manager) command to install Express.js. Open your terminal or command prompt and run the following command:
```
npm install express
```
This will download and install the Express.js package from the npm registry.
| 3. What is a middleware in Express.js? | |
Ans. A middleware in Express.js is a function that has access to the request and response objects, as well as the next middleware function in the application’s request-response cycle. It can perform various tasks such as modifying the request or response objects, executing additional code, or terminating the request-response cycle. Middleware functions are executed sequentially, and they can be used to add functionality to the Express.js application.
| 4. How do you define routes in Express.js? | |
Ans. In Express.js, you can define routes using the `app` object, which represents your Express application. The `app` object has various methods for defining routes, such as `app.get()`, `app.post()`, `app.put()`, and `app.delete()`. These methods take two arguments: the route path and a callback function that is executed when a request matches the route path. Inside the callback function, you can handle the request and send a response.
Example:
```
app.get('/users', (req, res) => {
// Handle the request and send a response
});
```
| 5. How can you handle query parameters in Express.js? | |
Ans. Query parameters in Express.js can be accessed using the `req.query` object. The `req.query` object contains key-value pairs of the query parameters in the URL. To access a specific query parameter, you can use dot notation or bracket notation with the parameter name.
Example:
```
// URL: http://example.com/users?id=123&name=John
app.get('/users', (req, res) => {
const id = req.query.id; // Access query parameter using dot notation
const name = req.query['name']; // Access query parameter using bracket notation
// Handle the request and send a response
});
```
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Dec 23, 2024 Last updated |
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