How to count the length of JSON response in React Native/JS?

Question

I would like to count the length of my response JSON. Here's my code:

getMoviesFromApiAsync() {
return fetch('http://sampleurl.com/' + CommonDataManager.getInstance().getUserID())
    .then((response) => response.json())
    .then((responseJson) => {
        this.setState({isLoading: false, listMessages: responseJson});    
    })
    .catch((error) => {
        console.error(error);
    });
}

Answer 1

Count the keys

  var myObject = {'key':'something', 'other-key':'something else','another-key': 'another thing'}
  var count = Object.keys(myObject).length;

Where myObject is your json response and count is the length of your object

This is the best way to count the json objects correctly

In your code you should add this in your second .then

var count = Object.keys(responseJson).length;