APIs (Application Programming Interfaces) let your application communicate with other systems—whether it’s a weather service, payment processor, or custom backend. Learning how to work with APIs is essential for modern developers.

API types:

• REST (most common): Communicates via HTTP methods (GET, POST, etc.).
• GraphQL: Allows clients to query only the data they need.
• WebSocket: Real-time, two-way communication.

Basic steps to consume a REST API:

1. Find documentation (e.g., https://api.openweathermap.org).
2. Make a request using fetch, Axios, or Postman. jsКопироватьРедактироватьfetch('https://api.example.com/data') .then(res => res.json()) .then(data => console.log(data));
3. Authenticate with an API key or token.
4. Handle errors with try/catch or .catch() methods.
5. Display data dynamically in the UI.

Tools to help:

• Postman for testing requests.
• Swagger or OpenAPI for interactive docs.
• Insomnia for debugging GraphQL or REST endpoints.

APIs power nearly every app today—learning how to read docs, make requests, and parse responses is foundational for both frontend and backend developers.