Udemy – Modern API Development: REST, GraphQL & gRPC

File Name:	Modern API Development: REST, GraphQL & gRPC
Content Source:	https://www.udemy.com/course/api-development-rest-graphql-grpc/
Genre / Category:	Programming
File Size :	8.1 GB
Publisher:	Uplatz Training
Updated and Published:	February 24, 2026

An API (Application Programming Interface) is a set of rules that allows one software application to communicate with another.

In simple terms, an API acts as a bridge between systems. It defines:

• How requests should be made
• What data format should be used
• What responses will be returned

It enables applications to talk to each other without exposing their internal implementation.

Simple Real-World Analogy

Think of an API like a restaurant waiter:

• You (client) place an order
• The waiter (API) takes your request to the kitchen (server)
• The kitchen prepares the food
• The waiter brings the response back to you

You never enter the kitchen. The API handles the communication.

How an API Works

Most modern APIs follow a request–response model.

1. Client Sends a Request

A client application sends a request to a server.
This request includes:

• Endpoint (URL)
• Method (GET, POST, PUT, DELETE)
• Headers
• Optional data (payload)

Example: GET /users/123

2. Server Processes the Request

The server:

• Validates the request
• Applies business logic
• Retrieves or modifies data (often in a database)

3. Server Sends a Response

The server returns:

• Status code (200, 404, 500, etc.)
• Data (usually JSON)

Example response:

• “id”: 123,
• “name”: “John Doe”

Types of APIs:

• REST APIs – Most common, use HTTP methods
• GraphQL APIs – Flexible data querying
• gRPC APIs – High-performance, binary protocol based
• WebSocket APIs – Real-time communication

Why APIs Are Important

APIs power almost everything today:

• Mobile apps talking to backend servers
• Payment gateways
• Cloud services
• Microservices communication
• AI model deployment

Without APIs, modern software ecosystems would not function. In summary, an API is a structured way for software systems to communicate securely, efficiently, and predictably.

DOWNLOAD LINK: Modern API Development: REST, GraphQL & gRPC

Modern_API_Development_REST_GraphQL_gRPC.part01.rar – 1000.0 MB
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Modern_API_Development_REST_GraphQL_gRPC.part03.rar – 1000.0 MB
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Modern_API_Development_REST_GraphQL_gRPC.part09.rar – 113.1 MB

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