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About This Course

Who this course is for:

  • Web designers
  • Web Developers
  • Anyone who is building a website
  • Webmasters and web coders creating web content

What you’ll learn: 

  • JavaScript Objects and how they are used in code to retrieve values and store groups of related data sets
  • JavaScript Arrays – a data structure commonly used in JSON to contain Objects
  • JSON vs JavaSCript Objects
  • Iterate Array Contents
  • JSON parse and Stringify
  • Tools online to help connect to endpoints and debug AJAX requests
  • Use of JavaScript Fetch to return content
  • GET and POST methods to web endpoints
  • Various examples of open web APIs


  • Knowledge of JavaScript
  • Programming and coding knowledge
  • HTML and some programming experience

If you’ve been looking to get started with AJAX and JSON, this course is for you.

Explore how you can connect to various endpoints on the web and get JSON data to use on your website. 

JSON data and JavaScript Objects

JavaScript Object Notation (JSON) is an open-standard file format or data interchange format that uses human-readable text to transmit data objects consisting of attribute–value pairs and array data types. It is a very common data format, with a diverse range of applications.

JSON is a language-independent data format. It was derived from JavaScript, but many modern programming languages include code to generate and parse JSON-format data. The official Internet media type for JSON is application/json. JSON file names use the extension .json.

Asynchronous JavaScript + XML (AJAX ) is a set of web development techniques using many web technologies on the client side to create asynchronous web applications. With Ajax, web applications can send and retrieve data from a server asynchronously in the background without interfering with the display and behavior of the existing page. By decoupling the data interchange layer from the presentation layer, Ajax allows web pages and, by extension, web applications, to change content dynamically without the need to reload the entire page.

In practice, modern implementations commonly utilize JSON instead of XML.

JavaScript Object

  • An object is a collection of related data and/or functionality
  • Functions can be contained in JavaScript objects they are referred to as methods within the object
  • JavaScript objects names don’t need quotes, can be single, double or none
  • Values can be Strings, Numbers, Booleans, Arrays, Objects
  • Create an object setting a variable name and assigning the {} to the variable
  • Object names can hold values of other objects and arrays
  • Can go multiple levels deep, as many as needed

Dot notation: The object name (person) acts as the namespace, then a dot, then the item you want to access.

Bracket notation: Similar format to arrays, instead of using an index number to select an item you are using the name associated with each member’s value.

JavaScript Array

  • An array can hold multiple values
  • Arrays cannot use strings as element indexes but must use integers.
  • Arrays are zero based, first index value is always 0;
  • Array values can be strings, numbers, booleans, arrays or objects
  • The design of objects and arrays is to hold lots of content. You can loop through the content in a number of ways using JavaScript

You can loop through the data in the array using a number of methods in JavaScript. Arrays need the index to find the value associated with it. If objects are contained within you should structure them the same way so it is easier to check the values contained.

Objects have length so using a for loop is possible. There is also Object.entries which can get the key and the value from the object.

Keep data structured the same so that you can easily determine where the values are located.

The JSON.stringify() method converts a JavaScript object or value to a JSON string

The JSON.parse() method parses a JSON string, constructing the JavaScript value or object described by the string

The JSON object contains methods for parsing JavaScript Object Notation (JSON) and converting values to JSON.

  • Objects and Arrays: Property names must be double-quoted strings; trailing commas are forbidden.
  • Numbers: Leading zeros are prohibited; a decimal point must be followed by at least one digit. NaN and Infinity are unsupported.

Please note that the scope of this course is creating a simple API and JSON and will not cover complex commands and everything about JavaScript. This is a how to get started course – if you are looking at more detailed node or JavaScript content, this is not for you.

Our Promise to You

By the end of this course, you will have learned how to connect to JSON data using AJAX webpage.

30 Day Money Back Guarantee. If you are unsatisfied for any reason, simply contact us and we’ll give you a full refund. No questions asked.

Get started today and learn more about JSON data.

Course Curriculum

1h 6m

Section 1 - Introduction To AJAX and JSON Data Use For Web Applications
API JSON Introduction 00:00:00
Introduction To JSON 00:00:00
Javascript Objects 00:00:00
Javascript Arrays 00:00:00
Output Contents 00:00:00
JSON Stringify JSON Parse 00:00:00
Validate lint JSON 00:00:00
Javascript Fetch AJAX Request 00:00:00
Fetch Web APIs AJAX From Web Pages 00:00:00
Javascript Arrow Function Format 00:00:00
Fetch Options GET 00:00:00
CORS With Request Debugging 00:00:00
More Open APIs Practice 00:00:00
Fun With APIs Tools And More 00:00:00
API Next Page Load All Pages 00:00:00
Post Method Send Data 00:00:00
Practice API Endpoints 00:00:00
More API Endpoints AJAX Exercise And JSON Data 00:00:00
API JSON Conclusion 00:00:00
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