Best way to rename object properties in ES6

I'm still learning js and I need an advice. I get json object from backend, but keys have underscores. What is best practice to rename keys to, for example folder_name to Folder name? The list of properties is known and finished so I can keep new names in constants. At frontend I already use it like this:

const showPropertiesList = properties => Object.keys(properties).map(property => (
  <PropertyKey key={property}}>
    `${property}: ${properties[property]}`
  </PropertyKey>
));

It's better to use rename function in this map or create separate function before to get all renamed keys with values?

json file:

properties {
  folder_name: 'test',
  user_email: 'test@example.com',
  user_agreed: 1,
  site: 'example.com',
}

You can create some kind of a mapping object and then use the following combination of Object.keys and reduce functions:

const properties = {
  folder_name: "test",
  user_email: "test@example.com",
  user_agreed: 1,
  site: "example.com"
};

const mapping = {
  folder_name: "Folder name",
  user_email: "User email",
  user_agreed: "User agreed",
  site: "Site"
};

const mapped = Object.keys(properties).reduce((acc, key) => (
  acc[mapping[key]] = properties[key],
  acc
), {});


console.log(mapped);

Or using creating a new object at each iteration:

const mapped = Object.keys(properties).reduce((acc, key) => ({
  ...acc,
  [mapping[key]]: properties[key]
}), {});