When using a function linked to an API request, an uncaught TypeError is thrown: Unable to access the 'includes' property of an undefined value

Utilizing the movie DB API (), I am displaying the results of my call on my page using Vue. The API supplies all the necessary data for me to achieve my objective, as demonstrated in this image https://i.stack.imgur.com/vP4I2.jpg

Beneath each show's name are the genres associated with that show. For instance, let's consider the information retrieved from the API when it provides me details about A-Team:

"backdrop_path": "/ggPjnOA5sap6wyuAGUY7kwRseEi.jpg",
            "first_air_date": "1983-01-23",
            "genre_ids": [
                10759
            ],
            "id": 1516,
            "media_type": "tv",
            "name": "A-Team",
            "origin_country": [
                "US"
            ],
            "original_language": "en",
            "original_name": "The A-Team",
            "overview": "Description of A-Team here",
            "popularity": 141.786,
            "poster_path": "/iJsueZM8TqQzeB55tol4mnyQzb9.jpg",
            "vote_average": 7.4,
            "vote_count": 574
        },

The sub-array called genre_ids contains the IDs of the genres associated with a specific show. To obtain the genre names, another API call is made which returns an array of objects containing genre IDs and names. By using this array, the associated genre name can be easily obtained and displayed.

I accomplished this operation by utilizing the .map function on the array received from the shows' API call:

searchShow() is triggered upon pressing enter in the input shown in the image above. this.userSearch corresponds to the v-model linked to that input.

...

This presents a challenge when a show lacks any associated genres, potentially causing errors in my project where Vue fails to display search results anymore. How can this issue be mitigated?

javascriptarraysvue.jsobjecttypeerror

Answer №1

If you are facing an issue where the variable element.genre_ids is missing from the API response, one solution could be to update how objectResults is being assigned:

let objectResults = element.genre_ids || [];

By making this change, you will ensure that a default empty array is assigned if the data obtained from the API is null or undefined.

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