Notes on Node.JS

Yes, Node.js provides a simple TCP based protocol and built-in debugging client. For debugging your JavaScript file, you can use debug argument followed by the js file name you want to debug. Syntax: node debug [script.js | -e “script” |<host>:<port> :] Yes, Node.js does provide a built-in debugger. The debugger module in Node.js allows developers … Read more

To avoid callbacks, you can use any one of the following options: You can use modularization. It breaks callbacks into independent functions. You can use promises. You can use yield with Generators and Promises. In Node.js, avoiding callbacks can be achieved through various methods, especially as JavaScript has evolved with the introduction of Promises and … Read more

All the API’s of Node.js library are asynchronous means non-blocking. A Node.js based server never waits for an API to return data. The Node.js server moves to the next API after calling it, and a notification mechanism of Events of Node.js responds to the server for the previous API call. In the context of Node.js, … Read more

Error-first callbacks are used to pass errors and data. If something goes wrong, the programmer has to check the first argument because it is always an error argument. Additional arguments are used to pass data. fs.readFile(filePath, function(err, data) { if (err) { //handle the error } // use the data object }); In Node.js, an … Read more

There are two types of API functions in Node.js: Asynchronous, Non-blocking functions Synchronous, Blocking functions In Node.js, there are primarily two types of API functions: Asynchronous, Non-blocking Functions: These functions do not block the execution of the code. They typically accept a callback function as an argument to be executed once the operation is completed … Read more