JSON (JavaScript Object Notation)

Stands for JavaScript Object Notation, is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It is primarily used to transmit data between a server and a web application as an alternative to XML.
An example of inner content a JSON file as an object:
{
"country": "USA",
"citiesInCountry": 10000,
"formed": 1776,
"active": true,
"cities": [
{
"name": "Los-Angeles",
"founded": 1781,
"streets": ["6th street", "7th street", ""]
},
{
"name": "Washington",
"founded": 1790,
"streets": ["6th street", "7th street", ""]
},
]
}
An example of inner content a JSON file as an array:
[
{
"name": "Los-Angeles",
"founded": 1781,
"streets": ["6th street", "7th street", ""]
},
{
"name": "Washington",
"founded": 1790,
"streets": ["6th street", "7th street", ""]
}
]
How to get data after loading in variable
country["cities"][1]["streets"][1];
Some notes, while writing and validating your own json file:
  1. Use only double quotes
  2. Do not left a comma after last element in an array
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