Axios Post с React-native

class LoginForm extends Component {
  constructor(props){
    super(props);
    this.state = {firstName:'', lastName: '', number: ''};
  }
  render(){
    return (
        <View>
        <Item floatingLabel>
        <Label>Ваше имя</Label>
        <TextInput Value = {this.state.firstName} onChangeText = {(firstName) => this.setState({firstName})}/>
        </Item>
        <Item floatingLabel>
        <Label>Ваша фамилия</Label>
        <TextInput value = {this.state.lastName} onChangeText = {(lastName) => this.setState({lastName})}/>
        <Text>{this.state.firstName}</Text>
        </Item>
        <Item floatingLabel>
        <Label>Номер телефона</Label>
        <TextInput value = {this.props.number} onChange = {(number) => this.setState({number})}/>
        </Item>
        <Button block style = {{marginTop:50}} 
        onPress = {() => {
          let data  = {
            firstname: this.state.firstName,
            lastname: this.state.lastName,
            number: this.state.number
          }
          axios.post('http://10.0.2.2:3000/user_add',data)
                  }}>
        <Text>Отправить</Text>
      </Button>
      </View>
    );
  }

    }

export default LoginForm;

app.post('/user_add',function(req,res){
var firstname = req.body.firstname;
var lastname = req.body.lastname;
var number = req.body.number;
var values = [firstname,lastname,number];
console.info(values);
  
 connection.query('INSERT INTO users (firstname, lastname, number) VALUES (?)',[values],function(err){
     if (!err) {
         console.info("User added!")
         res.send(firstname,lastname,number);
     } else {
         console.info(err);
     }
 })
});