JSON (JavaScript Object Notation) is a lightweight, text-based format for representing structured data. It was derived from the object literal syntax of JavaScript, but it is language-independent: virtually every modern programming environment can read and write it. In web development, JSON is the format you will most often encounter when a browser requests data from an API, when configuration files are stored, or when data is passed between a client and a server.
In this course, JSON matters because the rest of the module builds directly on it. Before you can fetch data from a remote source, parse it, loop through it, and render it into the DOM, you need to be able to read a JSON document confidently and recognize whether it is valid. That means knowing the six permitted value types (string, number, boolean, null, object, array), understanding that keys must be double-quoted strings, and being comfortable with structures that nest objects inside arrays inside objects, sometimes several levels deep.
As you watch the videos below, pay close attention to the small syntax details that trip people up: double quotes rather than single quotes, no trailing commas, no comments, and the distinction between a JSON text (a string) and a JavaScript object in memory. Also notice how each presenter describes the shape of the data — "an array of objects," for example — because being able to name a structure out loud is the first step toward writing code that traverses it.
A step-by-step walkthrough of JSON from the ground up. Based on its outline, it covers the origins of the format, the supported types (objects, arrays, strings, numbers, boolean, null), and the core syntax rules such as data being written as name/value pairs and separated by commas. Expect worked examples that build up from simple key/value pairs to more complete documents.
This is the most complete single introduction among the three, and its explicit coverage of types, objects, arrays, and syntax rules maps directly onto nearly every subtopic listed for this topic.
A short lesson from Microsoft's JavaScript for Beginners series that introduces JSON in the context of JavaScript objects. It discusses how JavaScript lets you create objects on the fly and how JSON provides a notation for expressing that data as text. Being only a few minutes long, it is a focused conceptual framing rather than an exhaustive syntax reference.
Produced by Microsoft Developer as part of a structured beginner curriculum, it reliably connects JSON notation to JavaScript object literals — the exact distinction you will need when you start converting between the two formats.
An introduction to JSON Schema, a vocabulary for describing and validating the structure of a JSON document. The video explains what a schema is, demonstrates generating a schema from an existing JSON sample, and shows how a schema can be used to validate whether data conforms to the expected shape and types.
Validation is a practical way to reinforce the syntax and type rules from this topic: seeing what a validator enforces makes the difference between valid and invalid JSON concrete rather than abstract.
Together these videos target MO1 most directly: the Automation Step by Step walkthrough enumerates JSON's syntax rules, data types, objects, arrays, and nesting, while the JSON Schema video reinforces those same rules from the validation side, giving you a check on whether a document is well formed. The Microsoft Developer video supports the groundwork for MO2 by situating JSON alongside JavaScript object literals, so that the later distinction between a JSON string and a live object — and the role of JSON.parse() and JSON.stringify() — has a clear conceptual footing. The fluency in reading nested arrays and objects that you gain here is also prerequisite to MO3 and MO5, where you will parse fetched responses and iterate over JSON arrays to build page content.
These videos were chosen from YouTube on October 3, 2026. Each has captions; the player turns them on. Videos on YouTube can be changed or removed — if one no longer plays, tell your instructor. If a player does not appear, use its Watch on YouTube link.