How to find by id in MongoDB?

To find by id in MongoDB, use the find() method as in the below syntax −

db.findByIdDemo.find({"_id" :yourObjectId});

To understand the above syntax, let us create a collection with documents −

> db.findByIdDemo.insertOne({"Value":10});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e07158925ddae1f53b621fc")
}
> db.findByIdDemo.insertOne({"Value":500});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e07158c25ddae1f53b621fd")
}
> db.findByIdDemo.insertOne({"Value":1000});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5e07159125ddae1f53b621fe")
}

Following is the query to display all documents from a collection with the help of find() method −

> db.findByIdDemo.find();

This will produce the following output −

"_id" : ObjectId("5e07158925ddae1f53b621fc"), "Value" : 10 }
{ "_id" : ObjectId("5e07158c25ddae1f53b621fd"), "Value" : 500 }
{ "_id" : ObjectId("5e07159125ddae1f53b621fe"), "Value" : 1000 }

Following is the query to find by id in MongoDB −/p>

> db.findByIdDemo.find({"_id" :ObjectId("5e07158c25ddae1f53b621fd")});

This will produce the following output −

{ "_id" : ObjectId("5e07158c25ddae1f53b621fd"), "Value" : 500 }