Learn JSON

Getting Started with JSON

JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others. These properties make JSON an ideal data-interchange language.

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Basic JSON Structure

A JSON object is a collection of key-value pairs. Keys are strings, and values can be strings, numbers, booleans, null, arrays, or other objects.

``json { "name": "John Doe", "age": 30, "isStudent": false, "hobbies": ["reading", "coding", "hiking"], "address": { "street": "123 Main St", "city": "Anytown" } } ``

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JSON Data Types

1. String: Enclosed in double quotes 2. Number: No quotes, can be integer or float 3. Boolean: true or false 4. Null: null 5. Array: Ordered list of values, enclosed in square brackets 6. Object: Collection of key-value pairs, enclosed in curly braces

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Valid JSON Rules

Keys must be strings enclosed in double quotes

Values must be one of the valid JSON types

Trailing commas are not allowed

Arrays and objects can be nested

Advanced JSON Concepts

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JSON Schema

JSON Schema is a vocabulary that allows you to annotate and validate JSON documents.

``json { "$schema": "http://json-schema.org/draft-07/schema#", "type": "object", "properties": { "name": { "type": "string" }, "age": { "type": "integer", "minimum": 0 }, "email": { "type": "string", "format": "email" } }, "required": ["name", "email"] } `

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JSONPath

JSONPath is a query language for JSON that allows you to extract data from JSON documents.

$ - Root object

$.name - Get the name property

$.hobbies[0] - Get the first hobby

$.hobbies[*] - Get all hobbies

$.address.city` - Get nested property

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Handling Large JSON Files

When working with large JSON files:

1. Use streaming parsers instead of loading the entire file 2. Consider pagination for API responses 3. Use compression (gzip) for transmission 4. Validate JSON before processing

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Performance Tips

Parse JSON once and cache the result

Use efficient serialization libraries

Minify JSON for network transmission

Consider binary formats like MessagePack for very large data