For this, use Object.keys() along with reduce(). To display the result, we will also use concat().
Example
Following is the code −
var details = { name: ["John", "David"], age1: "21", age2: "23" }, output = Object .keys(details) .reduce((obj, tempKey) => (obj[tempKey] = [].concat(details[tempKey]), obj), {}) console.log(output)
To run the above program, you need to use the following command −
node fileName.js.
Here, my file name is demo302.js.
Output
This will produce the following output on console −
PS C:\Users\Amit\javascript-code> node demo302.js { name: [ 'John', 'David' ], age1: [ '21' ], age2: [ '23' ] }