How to check for the existence of a null object in a nested object in JavaScript?

Question

Say for example if I have a 3 level deep javascript object

{CONN_INFO: {CFGSwitch: {412: {}}}}

How can I write a function that determines if it is nested? And secondly, how can I then convert the empty object {} to a string such as "{}"

If you really mean JSON, your syntax is incorrect. JSON requires all property names to be inside "double quotes". — Manngo
– Manngo, Commented May 8, 2017 at 4:55
{} is not a null value. It is an empty object. If you alert({}==null) you will get false. — Manngo
– Manngo, Commented May 8, 2017 at 4:57

Pang · Accepted Answer · 2017-05-08 06:02:41Z

1

How can I write a function that determines if it is nested?

For all keys of the current object, check its type, if JSON then nesting is present.

And secondly, how can I then convert the empty object {} to a string such as "{}"?

If you encounter a nested JSON object, check for its key length using Object.keys(currentJSONObj).length, if 0 then this is an empty JSON. So re-assign "{}" to the key which had empty JSON object at first place.

edited May 8, 2017 at 6:02

Pang

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answered May 8, 2017 at 5:10

Yash Soni

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2 Comments

tchan Over a year ago

Would I have to use a recursive function for the second part? Any idea how I could write it? I've now got a function to check how deep the nesting is.

Yash Soni Over a year ago

Yes.. Recursive function is the answer. Call it for every key within the object, if the value of that key is JSON again, recur!

Gopal · Accepted Answer · 2017-05-08 05:01:00Z

0

Iterate and check Object.keys(current_obj).length

answered May 8, 2017 at 5:01

Gopal

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