you have to use lodash to group data, then map data
var data = {
"key":"userSubscriptions",
"value":
[{"channel":"Netflix","user":"Bobby","region":"NA"},
{"channel":"Netflix","user":"Bobby","region":"EU"},
{"channel":"Netflix","user":"Jamie","region":"SEA"},
{"channel":"Prime Video","user":"Bobby","region":"NA"}]
}
var users = _.chain(data.value)
.groupBy("user").map((value, key) => ({ user: key, data: value })).value();
users.forEach(element => {
console.log(element)
console.log(`${element.user}, your region subscriptions are: Netflix: ${element.data.map(c=>c.channel).join(',')}, Prime Video: ${element.data.map(c=>c.region).join(',')}`)
});