JavaScript JSON
JSON (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 for transmitting data between a server and a web application.
JSON
Introduction to JSON
JSON (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 for transmitting data between a server and a web application.
Use Cases
- Commonly used in APIs to exchange data between a client and a server.
- Suitable for storing configuration settings and serializing complex data structures.
Do You Know?
JSON is a text-based format that uses a human-readable syntax that is easy to parse by machines. This makes it a popular choice for data exchange in web applications.
JSON Syntax Rules
JSON syntax is derived from JavaScript object notation. The basic rules include:
- Data is represented as key/value pairs.
- Keys must be strings enclosed in double quotes.
- Values can be:
- A string (in double quotes)
- A number
- An object (another JSON object)
- An array
- A boolean (true or false)
- Null
- Objects are enclosed in curly braces {} and consist of key/value pairs separated by commas.
- Arrays are enclosed in square brackets [] and can contain values of any type, including other arrays or objects.
{
"name": "John Doe",
"age": 30,
"isStudent": false,
"courses": ["HTML", "CSS", "JavaScript"],
"address": {
"street": "123 Main St",
"city": "Anytown"
}
}
JSON Methods
JSON.parse()
Definition: Parses a JSON string and constructs the JavaScript value or object described by it.
Usage: Useful for converting JSON data received from a server into a JavaScript object.
const jsonString = '{"name": "John Doe", "age": 30}';
const jsonObject = JSON.parse(jsonString);
console.log(jsonObject.name); // Outputs: John Doe
JSON.stringify()
Definition: Converts a JavaScript object or value to a JSON string.
Usage: Useful for sending data to a server or storing it in local storage.
const person = {
name: "John Doe",
age: 30,
};
const jsonString = JSON.stringify(person);
console.log(jsonString); // Outputs: {"name":"John Doe","age":30}
JSON Array
A JSON array is an ordered collection of values. It is similar to arrays in JavaScript and can contain any type of data.
[
{"name": "John Doe", "age": 30},
{"name": "Jane Doe", "age": 25}
]
JSON Server
JSON Server is a simple way to set up a fake REST API with minimal effort. It allows you to create a full fake REST API with JSON data.
Installation
Install Node.js and npm from Node.js official website.
Install JSON Server globally:
npm install -g json-server
Create a JSON file (e.g., db.json) with your data:
{
"users": [{ "id": 1, "name": "John Doe", "age": 30 }]
}
Start JSON Server:
json-server --watch db.json
Access it at http://localhost:3000.
Usage
- Ideal for testing front-end applications without needing a back-end server.
- Allows CRUD operations using standard HTTP methods.
Important Note
JSON Server is primarily for development purposes and is not intended for production use.
HTTP Methods in JSON Server
- GET: Retrieves data from the server.
- POST: Sends data to the server to create a new resource.
- PUT: Updates an existing resource on the server.
- PATCH: Applies partial modifications to a resource.
- DELETE: Deletes a resource from the server.
Avoid This
Avoid using JSON Server for sensitive data as it does not provide security features like authentication or authorization.
Summary
- JSON is a lightweight data interchange format that is easy to read, write, and parse.
- It is commonly used in APIs and for storing configuration settings.
- JSON Server provides a simple way to create a fake REST API for development purposes.
- JSON arrays are ordered collections of values that can contain any type of data.
- HTTP methods like GET, POST, PUT, PATCH, and DELETE are used for interacting with JSON Server.
Discussion
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