wgat is web api

A Web API (Application Programming Interface) is a way for different software applications to communicate with each other over the internet.

Think of it like a waiter in a restaurant:

• You (the client) place an order

• The waiter (API) takes it to the kitchen (server)

• The kitchen prepares the food

• The waiter brings it back to you

Simple Definition

A Web API allows one application to request data or services from another application using the web (usually via HTTP).

How It Works (Basic Flow)

1. A client (browser, mobile app) sends a request

2. The server receives it

3. The server processes it

4. The server sends back a response (usually in JSON or XML)

Example

When you open a weather app:

• The app sends a request to a weather API

• The API returns data like temperature, humidity, etc.

Key Concepts

1. HTTP Methods

These define what action you want to perform:

• GET ? Retrieve data

• POST ? Send data

• PUT ? Update data

• DELETE ? Remove data

2. Endpoints

An endpoint is a URL where the API can be accessed.

Example:

https://api.example.com/users

3. Request & Response

• Request ? What you send (URL, method, headers, body)

• Response ? What you get back (data + status code)

4. Status Codes

• 200 ? Success

• 404 ? Not found

• 500 ? Server error

5. JSON (Most Common Format)

Example response:

{
  "name": "Rahul",
  "age": 25
}

Types of Web APIs

• REST API (most popular, beginner-friendly)

• SOAP API (older, more complex)

• GraphQL API (flexible queries)

Beginner Example (Using JavaScript)

fetch('https://api.example.com/users')
  .then(response => response.json())
  .then(data => console.log(data));

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