How to check if an object exists before getting value?

Asked Feb 20 '20 at 06:36

Active Feb 20 '20 at 06:38

Viewed 31 times

I am parsing a json file and assigning the values from the json file to different parameters.

However, I am getting this error when accessing a nested object/parameter that doesn't exist

"TypeError: Cannot read property 'Record Data' of undefined"

I am accessing/saving them to diff parameters using something like this:

data[fileType][category]['parameterName1'] = obj[fileType][index][category]['Template 1']['1234']['Record Data']['key1']
data[fileType][category]['parameterName2'] = obj[fileType][index][category]['Template 2']['key2']

There are hundreds of parameters I need to parse and assign to parameters and some objects/parameters are optional so they will not be always in the json file. Also, please note that parameters have varying deepness. Some others are objects within objects and some are just normal parameters/properties.

So.. Is there a way for me to check if a certain parameter exists before actually assigning its value to a local parameter? Please note that I am dealing with hundreds of params so I am hoping that the implementation is cleanest possible.

edited Feb 20 '20 at 06:38

Vipul Kumar

asked Feb 20 '20 at 06:36

kzaiwo

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What do you want to be assigned if it doesn't exist? – CertainPerformance Feb 20 '20 at 06:37
I do not need it to be assigned if it does not exist. Thanks in advance for your help! – kzaiwo Feb 20 '20 at 06:38
better use conditional operators or an OR (||) while assigning – HubballiHuli Feb 20 '20 at 06:39

How to check if an object exists before getting value?

0 Answers0