JSON test for array

Question

I'm using a node module that returns some data. The data will be returned in one of two ways:

single record

single = {"records[]":{"name":"record1", "notes":"abc"}}

multiple records

multiple = {"records[]":[{"name":"record1", "notes":"abc"},{"name":"record2", "notes":"xyz"}]}

If I call the following I can get the value from single records

single['records[]'].name // returns "record1"

for multiple records I would have to call like this

multiple['records[]'][0].name // returns "record1"

problem occurs when I get back a single record but treat it as multiple

single['records[]'][0].name // returns undefined

right now I test like this:

var data = nodemodule.getRecords();
if(data['records[]'){ //test if records are returned
    if(data['records[]'].length){ //test if 'records[]' has length
        // ... records has a length therefore multiple exist
        // ... for loop to loop through records[] and send data to function call
    } else {
        // .length was undefined therefore single records
        // single function call where I pass in records[] data
    }
}

Is this the best way to test for single vs multiple records given that I'm under the constraints of what the node module returns or am I missing some easier way?

looks good to me, if there's no other requirements - always better to keep things simple. — i.terrible
– i.terrible, Commented Jun 29, 2018 at 15:41

Saif · Accepted Answer · 2018-06-29 15:56:14Z

1

You can use Array.isArray(obj)

obj The object to be checked.

true if the object is an Array; otherwise, false.

if(data['records[]']){
          if(Array.isArray(data['records[]'])){
            // console.log('multiple');
          }else{
            // console.log('single');
          }
        }

https://stackoverflow.com/a/26633883/4777670 Read this it has some faster methods.

edited Jun 29, 2018 at 15:56

answered Jun 29, 2018 at 15:43

Saif

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