Unexpected end of JSON input

The Movie Database Support

Hello, I am using a XMLHttpRequest to make a request to the server to get info about specific movies using a for loop. I am doing this to obtain the imdb id so that I can use another API to get the IMDb Ratings. I use a function to first retrieve all movies on the discover page, then use a for loop run a function which accesses each object in the array to set the IMDb Rating after a successful return of data from the server.

I am however getting this error:

Uncaught SyntaxError: Unexpected end of JSON input
    at JSON.parse (<anonymous>)
    at XMLHttpRequest.movieReq.onreadystatechange (discover.js:34)
    at loadIMDBDetails (discover.js:38)
    at MainFunc (discover.js:71)
    at discover.js:5

This is the XMLHttpRequest initialization statement:

movieReq.open('GET', 'https://api.themoviedb.org/3/movie/' + mO.id + '?api_key=<my_api_key>, false);

I am aware that this is returning data synchronously and will change that once I have fixed the issue of the unexpected end of JSON input error.

Please assist, TA

3 replies (on page 1 of 1)

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Reply by Travis Bell

STAFFMOD

on March 28, 2019 at 11:53 AM

Hi @MarineXII,

It's pretty hard for me to help troubleshoot this, without seeing the JSON you're trying to parse. Can you get a copy of the body that's being returned by the API when your code trips on this error?

Reply by MarineXII

STAFFMOD

on March 28, 2019 at 12:34 PM

{"adult":false,"backdrop_path":"/w2PMyoyLU22YvrGK3smVM9fW1jj.jpg","belongs_to_collection":null,"budget":152000000,"genres":[{"id":28,"name":"Action"},{"id":12,"name":"Adventure"},{"id":878,"name":"Science Fiction"}],"homepage":"https://www.marvel.com/movies/captain-marvel","id":299537,"imdb_id":"tt4154664","original_language":"en","original_title":"Captain Marvel","overview":"The story follows Carol Danvers as she becomes one of the universe’s most powerful heroes when Earth is caught in the middle of a galactic war between two alien races. Set in the 1990s, Captain Marvel is an all-new adventure from a previously unseen period in the history of the Marvel Cinematic Universe.","popularity":419.096,"poster_path":"/AtsgWhDnHTq68L0lLsUrCnM7TjG.jpg","production_companies":[{"id":420,"logo_path":"/hUzeosd33nzE5MCNsZxCGEKTXaQ.png","name":"Marvel Studios","origin_country":"US"}],"production_countries":[{"iso_3166_1":"US","name":"United States of America"}],"release_date":"2019-03-06","revenue":910298835,"runtime":124,"spoken_languages":[{"iso_639_1":"en","name":"English"}],"status":"Released","tagline":"Higher. Further. Faster.","title":"Captain Marvel","video":false,"vote_average":7.3,"vote_count":2885}

This is the returned JSON. I found the error is caused by my missing if statement. I was missing the following if statement:

if (this.readyState == 4 && this.status == 200)

Adding this statement fixed my issue!

Reply by Travis Bell

STAFFMOD

on April 3, 2019 at 2:27 PM

Happy to hear you sorted this out.

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The Movie Database Support

posted by MarineXII
STAFFMOD
on March 27, 2019 at 12:41 PM

3 replies (on page 1 of 1)

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Reply by Travis Bell

on March 28, 2019 at 11:53 AM

Reply by MarineXII

on March 28, 2019 at 12:34 PM

Reply by Travis Bell

on April 3, 2019 at 2:27 PM

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