What is API?

How API Works

An API is a set of rules and protocols defining how one program can access the functions or data of another. Think of an API as a restaurant menu: you see the list of dishes (available functions), choose what you need (send a request), and receive the result (server response). You do not need to know how the dish is prepared — you just need to know what to order.

In web development, APIs are most commonly implemented through HTTP requests: the client (browser, mobile app, or another server) sends a request to a specific URL with parameters, and the server returns data, usually in JSON format. The most common approaches are REST API and GraphQL, each with its own advantages.

Usage Examples

APIs are used everywhere: from integrating payment systems (Stripe, PayPal) and delivery services (DHL, FedEx) to connecting CRMs, analytics platforms, and external databases. Any modern web product interacts with dozens of APIs daily.

How Webparadox Works with APIs

We design APIs using an API-first approach: the interaction interface is defined before development begins, documented in OpenAPI/Swagger, covered with automated tests, and versioned. This allows frontend and backend teams to work in parallel, accelerating development. For high-load systems, we use GraphQL, gRPC, and event-driven architectures with WebSocket and message brokers.