convert JSON array of key value pairs to JSON Array of strings in Javascript - Stack Overflow

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so i have a JSON Object [{"key1":"val1","key2":"val2"},{"key1":"val1","key2":"val2"}]

and i essentially need to remove the keys so the output looks like [["val1","val2"],["val1","val2"]] in Javascript.

short of iterating through the array and then iterating through all the properties and mapping to a new JSON object is there any way i can remove the keys from the object, and turn the values in to a list in an array?

please no string splicing/ regex.

Thanks.

so i have a JSON Object [{"key1":"val1","key2":"val2"},{"key1":"val1","key2":"val2"}]

and i essentially need to remove the keys so the output looks like [["val1","val2"],["val1","val2"]] in Javascript.

short of iterating through the array and then iterating through all the properties and mapping to a new JSON object is there any way i can remove the keys from the object, and turn the values in to a list in an array?

please no string splicing/ regex.

Thanks.

• javascript
• arrays
• json

Share Improve this question Follow asked Jan 6, 2017 at 20:28 OOPMichaelOOPMichael 5022 silver badges88 bronze badges 4

• Does the order of the array elements matter? Is it OK if it's [["val2", "val1"], ["val1", "val2"]]? – Barmar Commented Jan 6, 2017 at 20:57
• yes it does but the accepted answer by @BrunoLM does preserve order. – OOPMichael Commented Jan 6, 2017 at 22:15
• No it doesn't, since the objects themselves don't preserve order. – Barmar Commented Jan 6, 2017 at 22:42
• ahhh you are correct, thanks!@ i didn't notice it, b/c the first few arrays contained the same keyed data. – OOPMichael Commented Jan 6, 2017 at 22:51

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5 Answers 5

Sorted by: Reset to default 5

Using ES2015 (ES6)

const arr = [{"key1":"val1","key2":"val2"},{"key1":"val1","key2":"val2"}]
arr.map(o => Object.values(o));

See

• Array.map
• Object.values

If you still need old browser support--pre ES6

var arr = [{"key1":"val1","key2":"val2"},{"key1":"val1","key2":"val2"}];

arr = arr.map(function(o){
   var a = [];
   for(var i in o){
      a.push(o[i])
   }
   return a;
});
console.log(arr);

Plain ES5 with Array#map

var array = [{ key1: "val1", key2: "val2" },{ key1: "val1", key2: "val2" }],
    mapped = array.map(function (o) {
        return Object.keys(o).map(function (k) {
            return o[k];
        });
    });

console.log(mapped);

.as-console-wrapper { max-height: 100% !important; top: 0; }

You need to loop over the object and make new arrays.

for (var i = 0; i < yourobject.length; i++) {
    var myArray = [];
    for (var key in yourobject) {
         myArray.push(yourobject[key]
    }
    console.log(myArray)
}

This should do it:

const arr = [{"key1":"val1","key2":"val2"},{"key1":"val1","key2":"val2"}];

const newArr = arr.map(obj => Object.values(obj));

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