const user = {
id: 20,
name: "John Dow",
role: "QA",
salary: 100
}

const apiTemplatesSet1 = [
"/api/items/%id%/%name%",
"/api/items/%id%/%role%",
"/api/items/%id%/%salary%"
];

const apiPathes = apiTemplatesSet1.map(apiPathTemplate => {
  return getApiPath(user, apiPathTemplate);
});



function getApiPath(obj, template) {
  let result = template
  template.match(/%(.*?)%/g).map(function(val){
      let currValue = val.replace(/%/g, '');
      result = result.replace(val, obj[currValue])
  });
return result;
}

console.log(encodeURI(apiPathes));