```html API Development | Esemia

Esemia

Build and Consume APIs Like a Pro

Master API development patterns, security, and integration techniques with real-world examples.

🔍 Start with APIs 👈 Previous: JavaScript
Intermediate Free

� What Are APIs Integrations?

GET /api/users/123 200 OK {"name": "Alice"}

APIs enable systems to communicate through defined endpoints. Learn to create and consume RESTful, GraphQL, and secure APIs. 

// Example REST Call
fetch('https://api.example.com/users')
  .then(response => response.json())
  .then(data => console.log('Data:', data))
  .catch(error => console.error('Error:', error));
Open in api-fetch.js
Continue ➡️

� Core API Patterns

REST Architecture

Use HTTP methods (GET, POST, etc) to manipulate resources with consistent URIs.

POST /api/books
Content-Type: application/json

{"title":"Web Dev", "author":"Jane"}

GraphQL

Query and mutate data using flexible schema-first API definitions.

query {'{'
user(id: "1") {'{'
name
email
'}'
'}'}

🔐 API Security & Advanced Concepts

Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9
Authentication

Secure endpoints with JWT tokens, API keys, and OAuth2.0 flows.

GET /api/data
Rate-Limit: 100/minute
Rate Limiting

Protect APIs from abuse with headers, sliding windows, and quotas.

Content-Type: application/json;charset=UTF-8
Content Negotiation

Handle multiple formats and versions efficiently with Accept headers.

Put These Skills into Practice

Build real-world APIs with complete security, validation, and versioning from scratch.

💡 Start Your API Project
```