<div> == <View>
<p> || <span> == <Text>
<button> == <TouchableHighlight>
<img /> == <Image />
<input /> == <TextInput />

import React, { Component } from 'react';

class SomeComponent extends Component {
  render () {
    return (
      <div>
        <p>Hello World</p>
      </div>
    )
  }
}

import React, { Component } from 'react';
import { Text, View } from 'react-native';

class SomeComponent extends Component {
  render () {
    return (
      <View>
        <Text>Hello World</Text>
      </View>
    )
  }
}

class MyComponent extends Component {
  render() {
    return (
      <View style={styles.container}>
        <Text style={styles.welcome}>
          Welcome to React Native!
        </Text>
        <Text style={styles.instructions}>
          To get started, edit index.android.js
        </Text>
        <Text style={styles.instructions}>
          Shake or press menu button for dev menu
        </Text>
      </View>
    );
  }
}

AppRegistry.registerComponent('MyComponent', () => MyComponent);

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
});

fetch('https://myapi.com/endpoint/', {
  method: 'POST',
  headers: {
    'Accept': 'application/json',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    firstParam: 'yourValue',
    secondParam: 'yourOtherValue',
  })
});