Accessing nested JSON value

Question

I am trying to access a certain value from a JSON object. The value I am trying to access is launches->rocket->agencies->abbrev from a JSON object that has a lot of nested objects and arrays. I can't access values below a certain nested level for some reason. Here is a screenshot of the JSON object logged in the console.

JSON Object screenshot http://prntscr.com/c6ym11 Edit: Link to the image, since embedding didn't work

Here is a link to an example of the JSON formatting in the returned data

These are the ways I have tried:

data = JSON.parse(data); var agency = []; var names = []; var configuration = []; for(i = 0; i < data.launches.length; i++){ //This works just fine names.push(data.launches[i].name); //This also works configuration.push(data.launches[i].rocket.configuration); //This returns undefined agency.push(data.launches[i].rocket.agencies.abbrev); //This generates Uncaught TypeError: Cannot read property 'abbrev' of undefined agency.push(data.launches[i].rocket.agencies[0].abbrev); }

I can access key:value pairs on the "rocket" level, but I cannot access anything nested below that level. Is there something wrong with how I am calling the data?

With your example json it would work. So you most likely have a part of json that you didn't show where agencies[0] is not there. jsfiddle.net/8oeu7qsm — baao
– baao, Commented Aug 17, 2016 at 18:17

ncox85 · Accepted Answer · 2016-08-17 18:28:07Z

From the structure of the json object it looks like you need an index off of the agencies. The last line of your code example should work.

I would imagine you would want something like

for(j = 0; j < data.launches[i].rocket.agencies.length; j++){ agency.push(data.launches[i].rocket.agencies[j].abbrev); }

This way if there are no agencies you will not get the error

Thanks. Syntax is a little off, but I was able to tweak it enough to make it work! Makes sense that I need another loop to determine the index of the agencies object.

ncox85 · Accepted Answer · 2016-08-17 18:24:51Z

This is what worked:

for(i = 0; i < data.launches.length; i++){ for(j = 0; j < data.launches[i].rocket.agencies.length; j++){ company.push(data.launches[i].rocket.agencies[j].abbrev); }; }

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