JSFiddle - React, Tailwind, and code Playground

JavaScript

var test = [{
    "key/1": "Value1",
    "key/2": "Value2"
}, {
    "key/1.1": "Value1.1",
    "key/2.1": "Value2.1"
}, {
    "key/1.2": "Value1.2",
    "key/2.2": "Value2.2"
}, {
    "key/1.3": "Value1.3",
    "key/2.3": "Value2.3"
}];

for (var i = 0; i < test.length; i++){
    Object.keys(test[i]).reduce(function (a, b) {
        test[i][b.toString().replace('/', '-')] = test[i][b];
        delete test[i][b];
    }, 1);
}


console.log(test);