How to use REST API in React Native Project

To use a REST API in a React Native project, you can use the fetch API or a third-party HTTP client like axios. Here is an example of how to make a GET request to a REST API using the fetch API in a React Native app:

import React, { useState, useEffect } from 'react';
import { View, Text, ActivityIndicator } from 'react-native';

const App = () => {
  const [data, setData] = useState(null);
  const [error, setError] = useState(null);
  const [loading, setLoading] = useState(false);

  useEffect(() => {
    const fetchData = async () => {
      setLoading(true);
      try {
        const response = await fetch('https://jsonplaceholder.typicode.com/posts');
        const json = await response.json();
        setData(json);
      } catch (error) {
        setError(error);
      } finally {
        setLoading(false);
      }
    };
    fetchData();
  }, []);

  if (loading) {
    return (
      <View>
        <ActivityIndicator />
      </View>
    );
  }

  if (error) {
    return (
      <View>
        <Text>{error.message}</Text>
      </View>
    );
  }

  if (!data) {
    return null;
  }

  return (
    <View>
      {data.map(item => (
        <View key={item.id}>
          <Text>{item.title}</Text>
        </View>
      ))}
    </View>
  );
};

export default App;

In this example, the fetch function sends a GET request to the https://jsonplaceholder.typicode.com/posts endpoint. The then method is called on the response object returned by fetch, and it parses the response as JSON.

Once the JSON data is received, you can use it in your React Native app by accessing the data variable in the callback function passed to the then method.

If you need to send other types of requests, such as POST or PUT, you can specify the request method in the options object passed as the second argument to the fetch function. For example, here is how to send a POST request with a JSON body:

fetch('https://api.example.com/endpoint', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    // Request body data
  }),
})
  .then((response) => response.json())
  .then((data) => {
    // Do something with the data
  });