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

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

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);
    });
}

• javascript

Share Improve this question Follow edited Sep 3, 2017 at 9:42 StudioTime 24k4040 gold badges128128 silver badges215215 bronze badges asked Sep 3, 2017 at 7:35 DeeeDeee 32922 gold badges99 silver badges2727 bronze badges 2

• 2 Please read Under what circumstances may I add “urgent” or other similar phrases to my question, in order to obtain faster answers? - the summary is that this is not an ideal way to address volunteers, and is probably counterproductive to obtaining answers. Please refrain from adding this to your questions. – halfer Commented Sep 3, 2017 at 8:19
• 2 You are welcome. The community also prefers titles written in natural English. Grammatically, "React How to count the length of a JSON response" doesn't make a lot of sense (though I understand the purpose of using "ReactJS" as a home-made tag). However, since we have a tagging system, it is better to merge the "tag" into the question, or get rid of it completely, since it is already in the tag list. – halfer Commented Sep 3, 2017 at 8:37

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1 Answer 1

Sorted by: Reset to default 16

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;

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