How to reference the key from json with node.js

Question

How would I access the following json data

"users":{
    "2211392761":{"username":"user1"},
    "14300995184":{"username":"user2"},
    "2781554712":{"username":"user3"},
    "3554341":{"username":"user4"},
    "202611":{"username":"user5"},
    "17754300653761":{"username":"user6"}
}

I have this so far and I am aware it is completely wrong:

Object.keys(jsonevents["events"]).forEach(function(key) {
    if(eventName == jsonevents["events"][key]["name"]){
        if(jsonevents["events"][key]["users"]){
            if(jsonevents['events'][key]["users"][message.author.id]){
                delete jsonevents['events'][key]["users"][message.author.id];
                fs.writeFile(eventsjson, JSON.stringify(jsonevents),'utf8');
                sayMessage += "```User is no longer part of the event "+jsonevents['events'][key]["name"]+"```";
            } else {
                sayMessage += "```user is not in the event "+jsonevents['events'][key]["name"]+"```";
            }
        } else {
            sayMessage += "```Why do we have no users```";
        }
    } else {
        //sayMessage += "```No event found```";
    }
});

I need to be able to access the key by passing in the username, so user2 would give me 14300995184 so i can then use this to remove the user from the event.

Mark · Accepted Answer · 2018-11-18 22:51:14Z

4

You can search through the Object.entries with find() and return the right object. It will return an array of key/value the key will be what you're after:

let users = {
    "2211392761":{"username":"user1"},
    "14300995184":{"username":"user2"},
    "2781554712":{"username":"user3"},
    "3554341":{"username":"user4"},
    "202611":{"username":"user5"},
    "17754300653761":{"username":"user6"}
}

let found = Object.entries(users).find(([key, value]) => value.username === "user2")
console.log(found && found[0]) // found is undefined if not found

answered Nov 18, 2018 at 22:51

Mark

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1 Comment

The-WebGuy Over a year ago

ooh, object.entries - i like that, thank you i will try it out

CertainPerformance · Accepted Answer · 2018-11-18 22:52:23Z

You can iterate over the entries (key-value pairs) of the users object, and use .find to find the username that matches the one you're trying to find. The first item in the entry (the key) will be what you're looking for:

const obj = {
  "users": {
    "2211392761": {
      "username": "user1"
    },
    "14300995184": {
      "username": "user2"
    },
    "2781554712": {
      "username": "user3"
    },
    "3554341": {
      "username": "user4"
    },
    "202611": {
      "username": "user5"
    },
    "17754300653761": {
      "username": "user6"
    }
  }
}
const findEntry = usernameToFind => {
  const foundEntry = Object.entries(obj.users)
    .find(([, { username }]) => username === usernameToFind);
  if (foundEntry) return foundEntry[0];
};
console.log(findEntry('user5'));
console.log(findEntry('userthatdoesntexist'));

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