Can I determine if a string is a MongoDB ObjectID?

Question

I am doing MongoDB lookups by converting a string to BSON. Is there a way for me to determine if the string I have is a valid ObjectID for Mongo before doing the conversion?

Answer 1

Here is some code I have written based on @andy-macleod's answer.

It can take either an int or string or ObjectId and returns a valid ObjectId if the passed value is valid or null if it is invalid:

var ObjectId= require('mongoose').Types.ObjectId;

function toObjectId(id) {

    var stringId = id.toString().toLowerCase();

    if (!ObjectId.isValid(stringId)) {
        return null;
    }

    var result = new ObjectId(stringId);
    if (result.toString() != stringId) {
        return null;
    }

    return result;
}