Javascript: Parse JSON to Array of Strings

Question

I have below JSON defined in the below manner of set, key and value.

[{
    "set1": {
        "key1": "value1"
    },
    "set2": {
        "key2": "value2"
    },
    "set3": {
        "key3": "value3"
    },
    "set4": {
        "key4": "value4"
    } 
}]

I would like to know how do I use plain/native javascript to get the array of strings in the below manner which consists of only various values.

["value1","value2","value3","value4"]

I have tried using Object.keys and Object.values but still no luck. It would be helpful to know how to handle it in plain javascript and not use any third party libraries.

Do you want to remove duplicates or only to display all values? — NeNaD
– NeNaD, Commented May 4, 2021 at 4:36

Miheo · Accepted Answer · 2021-05-04 07:44:58Z

4

A solution:

const data = {
  "set1": {
    "key1": "value1"
  },
  "set2": {
    "key2": "value2"
  },
  "set3": {
    "key3": "value3"
  },
  "set4": {
    "key4": "value4"
  }
}
var result = Object.keys(data).map(_ => Object.values(data[_])[0]);
console.log(result);

This outputs [ 'value1', 'value2', 'value3', 'value4' ]

edited May 4, 2021 at 7:44

Miheo

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answered May 4, 2021 at 4:15

Cristián Ormazábal

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2 Comments

Kishan Chaitanya Over a year ago

thanks so much, it does work :) but how about if i get the json in a array like [data]

Cristián Ormazábal Over a year ago

In your example data is an array with a single entry. If that is the general case, you could use data[0]... Otherwise, you could iterate over the items of that array.

loop · Accepted Answer · 2021-09-17 07:28:03Z

2

const data = [{
  "set1": {
    "key1": "value1"
  },
  "set2": {
    "key2": "value2"
  },
  "set3": {
    "key3": "value3"
  },
  "set4": {
    "key4": "value4"
  }
}]

console.log(data.reduce((values, o) => {
  Object.values(o).forEach(v =>
    values.push(...Object.values(v)));
  return values;
}, []));

// Or a more streamined version:

console.log(data.reduce((v, o) => v.concat(
Object.values(o).reduce((v, o) => v.concat(
Object.values(o))
, []))
, []));

edited Sep 17, 2021 at 7:28

answered May 4, 2021 at 4:38

loop

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Comments

NeNaD · Accepted Answer · 2021-05-04 05:06:07Z

This will cover the case with multiple array objects.

let data_array = [
    {
    "set1": {
        "key1": "value1"
    },
    "set2": {
        "key2": "value2"
    },
    "set3": {
        "key3": "value3"
    },
    "set4": {
        "key4": "value4"
    } 
    },
  {
    "set5": {
        "key1": "value5"
    },
    "set6": {
        "key2": "value1"
    },
    "set7": {
        "key3": "value2"
    },
    "set8": {
        "key4": "value3"
    } 
    }
];

let result =  data_array.reduce((accumulator, currentValue)=> {
    accumulator.push(...Object.keys(currentValue).map((key) => Object.values(currentValue[key])[0]));
  return accumulator;
}, []);

console.log(result)

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