How to convert string [formatted in array] into array javascript

Question

I'm working on Api with nodejs and I want to convert string format [10,20] in to array.

for example

//my co worker sent me string

employee_id : [ 10, 20 ];

and I check

if(Array.isArray(employee_id) || employee_id instanceof Array){
}

It's not working

andI try to typeof employee_id; it's return string

How can I change format string to an array

Answer 1

Parse your result to JSON before comparison.

const employees = JSON.parse(employee_id)
if(Array.isArray(employees) {

}

It might help you.

Answer 2

You can try with JSON.parse():

The JSON.parse() method parses a JSON string, constructing the JavaScript value or object described by the string.

if(Array.isArray(JSON.parse(employee_id)) || JSON.parse(employee_id) instanceof Array){
}

Demo:

var obj = {employee_id : '[ 10, 20 ]'};

console.log(typeof obj.employee_id);//string

if(Array.isArray(JSON.parse(obj.employee_id)) || JSON.parse(employee_id) instanceof Array){
  console.log('array')
}

Answer 3

API returns JSON string, So You have to parse the string to JSON object to check the acutal data type.

if(Array.isArray(JSON.parse(employee_id)) || JSON.parse(employee_id) instanceof Array){
}