JSFiddle - React, Tailwind, and code Playground
JavaScript
function replaceKeys(obj, find, replace) {
return Object.keys(obj).reduce (
(acc, key) => Object.assign(acc, { [key.replace(find, replace)]: obj[key] }), {});
}
// sample data
var link = [{
"USER-NAME": "abc",
"USER-DOB": "10/25/1985",
}, {
"USER_NAME": "xyz",
"USER_DOB": "10/25/1986"
}];
link = link.map(obj => replaceKeys(obj, /-/g, ' '));
// output result
document.write(JSON.stringify(link));