Learn Node JS

Learn Node JS

Node js json

  • What is JSON? For what is used for?
    JSON (JavaScript Object Notation) is a data storage and communication format based on key-value pair of JavaScript object literals. It is a lightweight text-based open standard designed for human-readable data interchange which is derived from the JavaScript programming language for representing simple data structures and associative arrays, called objects. In JSON all property names are surrounded by double quotes. values are restricted to simple data: no function calls, variables, comments, or computations. JSON is used for communication between javascript and serverside technologies.
  • How to convert Javascript objects into JSON?
    JSON.stringify(value); is used to convert Javascript objects into JSON. Example Usage: var obj={"website":"Onlineinterviewquestions"}; JSON.stringify(obj); // '{"website":"Onlineinterviewquestions"}'
  • List types Natively supported by JSON?
    JSON supports Objects, Arrays, Primitives (strings, numbers, boolean values (true/false), null) data types.
  • What does Object.create do?
    Object.create creates a new object with the specified prototype object and properties.
  • What does $.parseJSON() do ?
    $.parseJSON() takes a well-formed JSON string and returns the resulting JavaScript value.
  • What are different ways to create objects?
    You can create Object by object literals Object.create constructors
  • What is the default value of a constructor’s prototype?
    A plain, empty object that derives from Object.prototype is the default value of a constructor’s prototype
  • List some benefits of JSON over XML?
    It is faster and lighter than XML as on the wire data format XML data is typeless while JSON objects are typed JSON types: Number, Array, Boolean, String XML data are all string Data is readily available as JSON object is in your JavaScript Fetching values is as simple as reading from an object property in your JavaScript code
  • What is the difference between JSON and JSONP?
    JSON: JSON is a simple data format used for communication medium between different systems JSONP: It is a methodology for using that format with cross-domain ajax requests while not being affected by same origin policy issue.
  • What is JSON-RPC? List some Features of JSON-RPC-Java
    JSON-RPC: JSON-RPC is a simple remote procedure call protocol similar to XML-RPC although it uses the lightweight JSON format instead of XML. JSON-RPC-Java is a Java implementation of the JSON-RPC protocol.Below is list of some of its features Dynamically call server-side Java methods from JavaScript DHTML web applications. No Page reloading. Asynchronous communications. Transparently maps Java objects to JavaScript objects. Lightweight protocol similar to XML-RPC although much faster. Leverages J2EE security model with session specific exporting of objects. Supports Internet Explorer, Mozilla, Firefox, Safari, Opera, and Konqueror.
  • What are natively supported JSON types?
    Following data types are natively supported in JSON. Numbers: Integer, float or Double String: string of Unicode characters, must be rapped into double quotes “” Boolean: True or false Array: ordered list of 0 or more values Objects : An unordered collection key/ value pairs Null: An Empty value
  • How to convert an Object into JSON? What is the full syntax of JSON.stringify?
    JSON.stringify method is used to convert an Javascript Object into JSON. Syntax: let json = JSON.stringify(value[, replacer, space])

Overview

What you will learn?

Node.js is a free tool, cross-platform framework running on Mac OS, Windows, and Linux. Node.js course has been intended to help developers to learn and build web applications with the help of JavaScript. Node.js is an event-driven, server-side JavaScript environment that runs JavaScript utilizing the V8 engine developed by Google. The course focuses on different important concepts of Node.js and gives hands-on experience in building HTTP server with Node.js, working with the file system, buffers, stream, events, and multi-processing in Node.js.

What are the requirements?

Training attendees should have total knowledge of JavaScript. If you do not have so you can learn our javascript course because should be easy with web server application design concepts (such as accessing databases and SOA concepts), as well as basic HTML and CSS.

What I am going to get from this course

  • You will understand why server-side JavaScript is useful
  • Install Node.js
  • You will Learn how Node.js is architected to allow high scalability with asynchronous code
  • Create fundamentals of web applications with Node.js
  • Automate tasks with Gulp
  • Build an HTTP server using the core modules in Node.js
  • Use stream I/O to efficiently serve the web pages
  • Create modules to organize the server
  • Test the reliability of the application with unit tests
  • Turn the application to an MVC framework using Express
  • Interface to a MongoDB database and a web service

Target Audience

  • Web developers
  • DevOps engineers
  • Data Scientists
  • Game developers


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