Welcome to the JSON Tutorial

Learn how to read, write, validate, and exchange JSON. Short explanations, clear examples, compact code snippets, and practical patterns make it easy to work with JSON in APIs, configuration files, and data interchange.

This guide walks from basic JSON syntax to working with parsers, schema validation, streaming, and common integration patterns so you can handle structured data reliably. Get Started with JSON

JSON Example

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Simple JSON object
{
	"id": 1,
	"title": "Hello JSON",
	"tags": ["example", "tutorial"],
	"meta": {
		"author": "TutsInsider",
		"published": true
	}
}

Prerequisites

To get the most from this JSON tutorial you should have:

  • Basic familiarity with programming concepts
  • Comfort reading simple JavaScript or another scripting language
  • A text editor and a browser or runtime for testing examples
  • Optional tools, like a JSON validator or schema linter

What You Will Learn?

This tutorial covers essential JSON skills and real world practices:

  1. JSON syntax and data types
  2. Parsing and stringifying JSON
  3. Structuring nested data
  4. Schema basics and validation
  5. Accessing values with pointers and paths
  6. Streaming and large payload handling
  7. Working with JSON in APIs
  8. Safe parsing and common pitfalls
  9. JSON coding tools and utilities
  10. Quick JSON reference

Who should follow this tutorial

This course is useful for:

  • Beginners who need a reliable way to store and transfer data
  • API developers designing JSON endpoints
  • Backend engineers working with configuration and data interchange
  • Data engineers who process JSON streams or logs

How this course is structured

Lessons are compact and practice oriented and include:

  • Concept explained clearly in simple to understand language
  • Examples that show input and expected output
  • Other Languages working with JSON in other languages except JS
  • Mini projects for hands on experience

JSON Code Examples

Examples include parsing, fetching, schema validation and streaming.

Parse Example

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Try in CodeLab
Parsing JSON
// Parse JSON string
const userData = '{"user":"Bob","age":25,"admin":false}';
const obj = JSON.parse(userData);
document.getElementById('name').textContent = obj.user;
document.getElementById('age').textContent = obj.age;
document.getElementById('admin').textContent = obj.admin ? "Yes" : "No";

Fetch JSON

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Fetch and handle JSON
fetch('/api/items')
	.then(response => response.json())
	.then(data => {
		console.log('Received items', data);
	})
	.catch(err => {
		console.error('Fetch failed', err);
	});

Schema Example

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Simple JSON Schema
{
	"$schema": "http://json-schema.org/draft-07/schema#",
	"type": "object",
	"properties": {
		"id": { "type": "integer" },
		"name": { "type": "string" }
	},
	"required": ["id","name"]
}

Online HTML Editor

Practice with an online code editor to runs small JSON code snippets. The live environment helps you test parsing, schema rules, and fetch patterns without local setup.

Get Started

Start with the introduction to learn how to format JSON correctly, and how to include it in APIs or configuration files. You can use online validators & formatters or local tools to inspect data. Follow the JSON intro chapter to get started with core concepts and basics.

Feedback and fixes are welcome. Send suggestions or report issues via the contact page.