Modern API Development: REST, GraphQL & gRPC

Design and build production-ready APIs using REST, GraphQL, and gRPC with modern architecture and deployment strategies.

What you’ll learn
✓ Understand modern API architectures and design principles
✓ Build robust REST APIs following industry best practices
✓ Develop advanced REST endpoints with proper validation and error handling
✓ Design and implement GraphQL APIs including advanced schema patterns
✓ Build high performance gRPC services for distributed systems
✓ Compare REST, GraphQL, and gRPC and choose the right approach for different use cases
✓ Implement API Gateway strategies and deploy APIs to production environments
✓ Design and build a complete end-to-end API system in the capstone project
✓ Apply microservices communication patterns using modern API technologies
✓ Prepare confidently for API and backend focused technical interviews

Requirements
● Enthusiasm and determination to make your mark on the world!

Description
A warm welcome to Modern API Development: REST, GraphQL & gRPC course by Uplatz.

What is an API?

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.

REST API

REST (Representational State Transfer) is the most widely used API architecture. It uses standard HTTP methods such as GET, POST, PUT, and DELETE to interact with resources. Each resource is accessed via a unique URL, and responses are typically returned in JSON format.

REST is simple, widely supported, and ideal for web and mobile applications. It works well for standard CRUD operations and is easy to understand and implement.

GraphQL

GraphQL is a query language for APIs that allows clients to request exactly the data they need. Instead of multiple endpoints like REST, GraphQL typically uses a single endpoint where the client specifies the structure of the response.

It reduces over-fetching and under-fetching of data and is particularly useful for complex applications where the frontend needs flexible and efficient data retrieval.

gRPC

gRPC is a high-performance RPC (Remote Procedure Call) framework developed by Google. It uses Protocol Buffers instead of JSON and communicates over HTTP/2, making it faster and more efficient than REST.

gRPC is commonly used in microservices architectures and distributed systems where performance, low latency, and strong typing are important.

Key Differences

• REST is resource-based and uses multiple endpoints. It is simple and widely adopted for web APIs.

• GraphQL is query-based and uses a single endpoint. It gives clients precise control over the data they receive.

• gRPC is method-based and focuses on performance. It uses binary serialization and is best suited for internal service-to-service communication.

In short, REST is simple and universal, GraphQL is flexible and efficient for complex data needs, and gRPC is optimized for speed and distributed systems.

With this Modern API Development: REST, GraphQL & gRPC course, design, build, and deploy modern production-ready APIs using REST, GraphQL, and gRPC.

APIs power everything from mobile apps and SaaS platforms to cloud-native microservices and distributed systems. This course gives you a complete understanding of modern API technologies and how to use them effectively in real-world backend architectures.

Whether you are building web services, designing microservices, or preparing for system design interviews, this course equips you with practical API engineering skills.

Why Learn API Development?

Modern applications depend on well-designed APIs for scalability, performance, and maintainability. Understanding when to use REST, GraphQL, or gRPC is a critical skill for backend engineers and architects.

This course helps you

• Understand modern API architecture principles

• Build scalable REST APIs

• Design flexible GraphQL APIs

• Develop high-performance gRPC services

• Compare and choose the right API approach for different scenarios

• Deploy APIs using API Gateway strategies

What You Will Learn

• Fundamentals of modern API architectures

• REST API design and advanced implementation techniques

• GraphQL fundamentals and advanced schema patterns

• High-performance gRPC service development

• API comparison and architectural decision making

• API Gateway concepts and deployment strategies

• Build a complete capstone project: Unified Library Service

By the end of this course, you will be able to design and implement production-ready API systems confidently.

Hands-On and Practical

This is not a theory-only course. You will

• Build working REST, GraphQL, and gRPC services

• Implement advanced features and best practices

• Compare API technologies through real examples

• Design a unified multi-protocol API system in the capstone project

The capstone project integrates everything you learn into a real-world API architecture scenario.

Who this course is for
■ Backend developers who want to master REST, GraphQL, and gRPC
■ Software engineers building APIs and microservices
■ Full stack developers strengthening backend architecture skills
■ Cloud engineers working with distributed systems
■ DevOps engineers managing API deployments and gateways
■ Platform engineers designing scalable service communication
■ Computer science students preparing for backend roles
■ Developers preparing for system design and API-focused interviews
■ Technical architects evaluating API strategies for modern applications

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