Added JSON sheet.
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# JSON Cheat Sheet
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## Table of Contents
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1. [Introduction to JSON](#introduction-to-json)
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2. [JSON Data Types](#json-data-types)
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2.1 [String](#string)
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2.2 [Number](#number)
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2.3 [Boolean](#boolean)
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2.4 [Array](#array)
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2.5 [Object](#object)
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2.6 [Null](#null)
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3. [JSON Syntax](#json-syntax)
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4. [JSON Example](#json-example)
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5. [Reading and Writing JSON in Python](#reading-and-writing-json-in-python)
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6. [Accessing JSON Data in JavaScript](#accessing-json-data-in-javascript)
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7. [Accessing JSON Data in PHP](#accessing-json-data-in-php)
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```json
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{
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"name": "JSON Cheat Sheet",
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"version": "1.1",
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"author": "OpenAI",
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"topics": ["JSON", "Data Types", "Syntax", "Example"]
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}
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```
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## 1. Introduction to JSON
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- JSON stands for **JavaScript Object Notation**.
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- It is a lightweight data interchange format.
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- JSON is language-independent and easy for humans to read and write.
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- Commonly used for data exchange between a server and web application, as well as for configuration files.
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## 2. JSON Data Types
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### 2.1 String
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- Represents a sequence of characters.
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- Enclosed in double quotes.
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- Example: `"Hello, World!"`
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### 2.2 Number
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- Represents a numerical value (integer or floating-point).
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- Example: `42` or `3.14`
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### 2.3 Boolean
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- Represents a logical value, either `true` or `false`.
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### 2.4 Array
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- Ordered list of values.
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- Enclosed in square brackets `[]`.
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- Example: `[1, 2, "three", true]`
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### 2.5 Object
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- Unordered collection of key-value pairs.
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- Enclosed in curly braces `{}`.
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- Example: `{"name": "John", "age": 30, "city": "New York"}`
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### 2.6 Null
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- Represents a null or empty value.
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## 3. JSON Syntax
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- Data is represented in key-value pairs.
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- Keys are always strings and followed by a colon.
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- Pairs are separated by commas.
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- Objects are enclosed in curly braces `{}`.
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- Arrays are enclosed in square brackets `[]`.
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## 4. JSON Example
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```json
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{
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"name": "John Doe",
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"age": 25,
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"isStudent": false,
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"courses": ["Math", "History", "Science"],
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"address": {
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"street": "123 Main St",
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"city": "Anytown",
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"zip": "12345"
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},
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"contact": null
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}
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```
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## 5. Reading and Writing JSON in Python
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```python
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import json
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# Reading JSON from a file
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with open('data.json', 'r') as json_file:
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data = json.load(json_file)
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print(data)
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# Writing Python data to a JSON file
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data_to_write = {"name": "Jane Doe", "age": 30, "city": "AnotherTown"}
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with open('output.json', 'w') as json_file:
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json.dump(data_to_write, json_file, indent=4)
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```
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## 6. Accessing JSON Data in JavaScript
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```javascript
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// Assuming jsonString is a JSON string
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var jsonData = JSON.parse(jsonString);
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// Accessing data
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console.log(jsonData.name); // Outputs: John Doe
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console.log(jsonData.address.city); // Outputs: Anytown
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```
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## 7. Accessing JSON Data in PHP
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```php
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// Assuming jsonString is a JSON string
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$jsonData = json_decode($jsonString, true);
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// Accessing data
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echo $jsonData['name']; // Outputs: John Doe
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echo $jsonData['address']['city']; // Outputs: Anytown
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```
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```
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20
README.md
20
README.md
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@ -1,18 +1,14 @@
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# CheetSheetz
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## Personal composition of various technical "cheat sheets".
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### A compendium of various technical "cheat sheets".
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[JavaScript](https://git.namenode.xyz/CSnap/cheetsheetz/src/branch/main/javascript.md)
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[Markdown](https://git.namenode.xyz/CSnap/cheetsheetz/src/branch/main/markdown.md)
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[Perl](https://git.namenode.xyz/CSnap/cheetsheetz/src/branch/main/perl.md)
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[PHP](https://git.namenode.xyz/CSnap/cheetsheetz/src/branch/main/PHP.md)
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[Python](https://git.namenode.xyz/CSnap/cheetsheetz/src/branch/main/python.md)
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[LEMP Guide](https://git.namenode.xyz/CSnap/cheetsheetz/src/branch/main/LEMP.md)
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- [JavaScript](https://git.namenode.xyz/CSnap/cheetsheetz/src/branch/main/javascript.md)
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- [JavaScript Object Notation](https://git.namenode.xyz/CSnap/cheetsheetz/src/branch/main/JSON.md)
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- [Markdown](https://git.namenode.xyz/CSnap/cheetsheetz/src/branch/main/markdown.md)
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- [Perl](https://git.namenode.xyz/CSnap/cheetsheetz/src/branch/main/perl.md)
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- [PHP](https://git.namenode.xyz/CSnap/cheetsheetz/src/branch/main/PHP.md)
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- [Python](https://git.namenode.xyz/CSnap/cheetsheetz/src/branch/main/python.md)
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- [LEMP Guide](https://git.namenode.xyz/CSnap/cheetsheetz/src/branch/main/LEMP.md)
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