Category: JavaScript

To send headers with form data using request module with Node.js, we call the post method.

For instance, we write

const req = require("request");

req.post(
  {
    url: "someUrl",
    form: {
      username: "user",
      password: "",
      opaque: "someValue",
      logintype: "1",
    },
    headers: {
      "User-Agent":
        "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.110 Safari/537.36",
      "Content-Type": "application/x-www-form-urlencoded",
    },
    method: "POST",
  },

  (e, r, body) => {
    console.log(body);
  }
);

to call post with an object with the form property set to an object with the form data key-value pairs to send them as the post request body.

We get the response from the body parameter in the callback.

To add timestamp to logs using Node.js library Winston, we set the transports property to an array with the Winston console object with the timestamp option set to true.

For instance, we write

const winston = require("winston");
const logger = new winston.Logger({
  transports: [new winston.transports.Console({ timestamp: true })],
});

to create the Logger with the transports property set to an array with an array of loggers.

We create a logger with the Console constructor by calling it with an object with the timestamp property set to true to add a timestamp to each log entry.

To fix the ‘Uncaught Error: Module did not self-register ‘ with JavaScript, we remove the node_modules folder and reinstall all the packages.

To do this, we run

rm -r node_modules

to delete the node_modules folder.

Then we run

npm install

to install all packages again.

To use the DOMParser with Node.js, we use the xmldom package.

For instance, we write

const DOMParser = require("xmldom").DOMParser;
const parser = new DOMParser();
const document = parser.parseFromString("Your XML String", "text/xml");

to import DOMParser with require.

And then we create a DOMParser object.

We then call parseFromString to parse the XML string.