JavaScript error: forEach is not a function

I've encountered an issue while attempting to loop through a JSON object to extract data. Whenever I run my code, I receive this error:

Type Error: element.listing.forEach is not a function.

It's worth mentioning that I've used this method earlier in my code, and it worked flawlessly. I tried the solutions provided on forEach is not a function error with JavaScript array, but none of them resolved the issue. Instead, the string ended up being filled with white spaces. Here's the snippet of my code:

var JSONBody = JSON.parse(body);
var dataString = "";
var count = 0;

//Get required data from response body:
JSONBody.forEach(function(element) {
if(element.listing != null){
    element.listing.forEach(function (element2) {
        dataString = dataString + element2.media[0].url;
        dataString = dataString + "!!!";
        dataString = dataString + element2.propertyDetails.bedrooms;
        dataString = dataString + "!!!";
        dataString = dataString + element2.propertyDetails.bathrooms;
        dataString = dataString + "!!!";
        dataString = dataString + element2.propertyDetails.carspaces;
        dataString = dataString + "!!!";
        dataString = dataString + element2.propertyDetails.displayableAddress;
        dataString = dataString + "|||";

        //console.log(element2.media[0].url);
        count++;
    }, this);
    console.log(dataString);
    }else{
        dataString = "";
        console.log("Listings is NULL!");
    }
}, this);

JSONBody structure:

[ { type: 'PropertyListing',
    listing:
     { listingType: 'Rent',
       id: 11658083,
       advertiser: [Object],
       priceDetails: [Object],
       media: [Array],
       propertyDetails: [Object],
       headline: 'Ultra Modern Furnished Apartment with Stunning Views',
       summaryDescription: '<b>Ultra Modern Furnished Apartment with Stunning Views</b><br />Brisbane\'s newest luxury complex \'Spire\' hits the market with huge popularity. Apartment 2704 offers the lucky resident the very best of the already stunning facilities and views with 27t...',
       hasFloorplan: false,
       hasVideo: false,
       labels: [Array],
       inspectionSchedule: [Object],
       listingSlug: '2704-550-queen-street-brisbane-city-qld-4000-11658083' } },...

Answer №1

` element, it is explained that `JSONBody` is recognized as an Object, rather than an Array. This means that in order to iterate through it, you can utilize `Object.keys` (which provides an array of keys) and `Array.prototype.forEach` (allowing three parameters to be passed to the callback function for more control: `item`, `index`, `array`). The following code snippet demonstrates how to achieve this:
Object.keys(JSONBody).forEach(function(key, index) {
    // key: the name of the object key
    // index: the ordinal position of the key within the object 
});

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