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JSON

JSON Cheat Sheet - 快速参考指南，收录常用语法、命令与实践。

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Getting Started

Introduction

JSON is a lightweight text-based open standard designed for human-readable data interchange.

JSON stands for JavaScript Object Notation
JSON is easy to read and write.
JSON is language agnostic data-interchange format
JSON filename extension is .json
JSON Internet Media type is application/json

{.marker-round}

Examples

JSON

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{
	"name": "Jason",
	"age": 39,
	"height": 1.92,
	"gender": "M",
	"salary": 70000,
	"married": true,
	"children": [
		{ "name": "Tom", "age": 9, "gender": "M" },
		{ "name": "Ava", "age": 7, "gender": "F" }
	]
}

Types

Type	Description
`Number`	Double precision floating-point
`String`	Series of characters
`Boolean`	`true` or `false`
`Array`	Ordered sequence of values
`Value`	String, Number, Boolean, null etc
`Object`	Unordered collection of key/value pairs
`null`	Null or Empty

String


`\"`	Double quote
`\\`	Backslash
`\/`	Forward slash
`\b`	Backspace
`\f`	Form feed
`\n`	Newline
`\r`	Carriage return
`\t`	Tab
`\u`	Trailed by four hex digits

Examples

JSON

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{
	"url": "https://cheatsheets.zip",
	"msg": "Hi,\n\"CheatSheets.zip\"",
	"intro": "Share quick reference and cheat sheet for developers."
}

Invalid String

JSON

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{ "foo": "bar" }

Have to be delimited by double quotes

Number

Type	Description
`Integer`	Digits 1-9, 0 and positive or negative
`Fraction`	Fractions like 0.3, 3.9
`Exponent`	Exponent like e, e+, e-, E, E+, E

Examples

JSON

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{
	"positive": 12,
	"negative": -1,
	"fraction": 10.25,
	"exponent": 1.0e2,
	"zero": 0
}

Invalid Number

JSON

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{ "foo": 0xff }

In JSON you can use only Decimal Literals

Objects

JSON

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{
	"color": "Purple",
	"id": "210",
	"composition": {
		"R": 70,
		"G": 39,
		"B": 89
	},
	"empty_object": {}
}

Multiple key/value pairs separated by a comma

Arrays

JSON

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[1, 2, 3, 4, 5]

Begins with [ and ends with ]

Array of objects

JSON

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{
	"children": [
		{ "name": "Jimmy Smith", "age": 15 },
		{ "name": "Sammy Sosa", "age": 12 }
	]
}

Object of arrays

JSON

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{
	"attributes": ["a1", "a2"],
	"methods": ["getter", "setter"],
	"empty_array": []
}

2D Array

JSON

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{
	"my_sequences": [
		[1, 2, 3],
		[4, 5, 6],
		[7, 8, 9, 0],
		[10, 11]
	]
}

Object of objects

JSON

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{
	"Mark McGwire": {
		"hr": 65,
		"avg": 0.278
	},
	"Sammy Sosa": {
		"hr": 63,
		"avg": 0.288
	}
}

Nested

JSON

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{
	"Jack": {
		"id": 1,
		"name": "Franc",
		"salary": 25000,
		"hobby": ["a", "b"],
		"location": {
			"country": "A",
			"city": "A-A"
		}
	}
}

Access JSON in JavaScript

Access Object

JAVASCRIPT

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let myObject = {
	name: 'Jason',
	last: 'Doe',
	age: 39,
	gender: 'M',
	salary: 70000,
	married: true
};


`myObject.name`	"Jason"
`myObject["name"]`	"Jason"
`myObject.age`	39
`myObject.other`	undefined
`myObject[0]`	undefined

Access Nested

JAVASCRIPT

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let myObject = {
	ref: {
		name: 0,
		last: 1,
		age: 2,
		gender: 3,
		salary: 4,
		married: 5
	},
	jdoe: ['Jason', 'Doe', 39, 'M', 70000, true],
	jsmith: ['Tom', 'Smith', 42, 'F', 80000, true]
};


`myObject.ref.age`	2
`myObject["ref"]["age"]`	2
`myObject.jdoe`	["Jason", "Doe", 39 ...]
`myObject.jsmith[3]`	"F"
`myObject[1]`	undefined

Access Array of Objects

JAVASCRIPT

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let myArray = [
	{
		name: 'Jason',
		last: 'Doe',
		age: 39,
		gender: 'M',
		salary: 70000,
		married: true
	},
	{
		name: 'Tom',
		last: 'Smith',
		age: 42,
		gender: 'F',
		salary: 80000,
		married: true
	},
	{
		name: 'Amy',
		last: 'Burnquist',
		age: 29,
		gender: 'F',
		salary: 60000,
		married: false
	}
];


`myArray[0]`	`{`"name": "Jason", ...`}`
`myArray[1].name`	"Tom"
`myArray[1][2]`	42
`myArray[3]`	undefined
`myArray[3].gender`	TypeError: Cannot read...

Access Array

JAVASCRIPT

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let myArray = ['Jason', 'Doe', 39, 'M', 70000, true];


`myArray[1]`	"Doe"
`myArray[5]`	true
`myArray[6]`	undefined

Also see

JSON (json.org)
JSON Editor Online (jsoneditoronline.org)
Convert JSON Array to Markdown Table, CSV and more (tableconvert.com)

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JSON

Getting Started

Examples

Invalid String

Examples

Invalid Number

Access JSON in JavaScript

Also see

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