How to send data in nodejs

Node.js is a server-side JavaScript environment based on the Chrome V8 engine. Using Node.js allows front-end developers to write back-end code with JavaScript, thereby achieving front-end and back-end JavaScript consistency. In Node.js, you can use the HTTP module to send data, or you can use third-party modules such as Request, SuperAgent, etc. to send data.

1. Use the HTTP module to send data

The HTTP module of Node.js is one of the modules natively provided by Node.js. It can easily create HTTP clients and servers. You can use the request method in the HTTP module to directly send HTTP requests and send data. The usage of the HTTP module is as follows:

const http = require('http');

const data = JSON.stringify({
  title: 'foo',
  body: 'bar',
  userId: 1
});

const options = {
  hostname: 'jsonplaceholder.typicode.com',
  path: '/posts',
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Content-Length': data.length
  }
};

const req = http.request(options, (res) => {
  console.log(`statusCode: ${res.statusCode}`);

  res.on('data', (d) => {
    process.stdout.write(d);
  });
});

req.on('error', (error) => {
  console.error(error);
});

req.write(data);
req.end();

In the above code, first use the JSON.stringify method to convert the data into JSON string format, and then define the request headers and the requested URL. When sending a request, you can directly use the req.write method to send data to the server. After sending, end the request through the req.end method.

2. Use third-party modules to send data

In addition to using the HTTP module to send data, you can also use third-party data sending modules, such as Request, SuperAgent, etc. These modules usually encapsulate native HTTP modules, adding more functions and simplifying request operations. For example, the code for sending data using the Request module is as follows:

const request = require('request');

const options = {
  url: 'https://jsonplaceholder.typicode.com/posts',
  method: 'POST',
  json: {
      title: 'foo',
      body: 'bar',
      userId: 1
  }
};

request(options, (error, response, body) => {
  if (error) throw new Error(error);
  console.log(body);
});

In the above code, the requested URL and requested method are first defined, and the data is sent directly as a JSON object through the json attribute. After the sending is completed, the server response data is returned through the defined callback function.

Summary

The above introduces two methods of sending data in Node.js. If you need to send a request with data, you can choose the appropriate method to operate. Using the HTTP module to send requests can be more flexible, and using third-party modules can complete the requested operation faster. No matter which method is adopted, the choice needs to be based on the actual situation.

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