JSON (JavaScript Object Notation)

JSON (JavaScript Object Notation) is an open standard file format and data interchange format that uses human-readable text to store and transmit data objects consisting of attribute-value pairs and arrays.

Despite its name and origin in JavaScript, JSON is language-independent. Most modern programming languages include code to generate and parse JSON-format data.

Syntax Rules

Data in JSON is organized in two structures:

1. A collection of name/value pairs: In various languages, this is realized as an object, record, struct, dictionary, hash table, keyed list, or associative array.
2. An ordered list of values: In most languages, this is realized as an array, vector, list, or sequence.

A JSON object is enclosed in curly braces {} and contains key-value pairs separated by commas. Keys must be strings enclosed in double quotes "".

{
  "firstName": "John",
  "lastName": "Doe",
  "age": 30,
  "isEmployee": true,
  "skills": ["JavaScript", "HTML", "CSS"],
  "address": {
    "street": "123 Main St",
    "city": "Anytown"
  }
}

Data Types

JSON supports the following basic data types:

• String: A sequence of zero or more Unicode characters enclosed in double quotes.
• Number: An integer or a floating-point number.
• Boolean: true or false.
• Null: An empty value, represented by the word null.
• Object: An unordered collection of key-value pairs.
• Array: An ordered sequence of values.