Add MD5 hash value to MongoDB collection?

To add MD5 hash value, use hex_md5(). Let us first create a collection with documents −

>db.addMd5HashValueDemo.insertOne({"UserName":"Adam","UserPassword":"Adam123456"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd6a4c66d78f205348bc619")
}
>db.addMd5HashValueDemo.insertOne({"UserName":"Chris","UserPassword":"Chris_121#"});
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5cd6a4e46d78f205348bc61a")
}

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

> db.addMd5HashValueDemo.find();

This will produce the following output −

{ "_id" : ObjectId("5cd6a4c66d78f205348bc619"), "UserName" : "Adam", "UserPassword" : "Adam123456" }
{ "_id" : ObjectId("5cd6a4e46d78f205348bc61a"), "UserName" : "Chris", "UserPassword" : "Chris_121#" }

Following is the query to add md5 hash value to mongo collection −

> db.addMd5HashValueDemo.find().forEach( function(documentPass){
   documentPass.Value = hex_md5(documentPass.UserPassword);
   db.addMd5HashValueDemo.save(documentPass);
});

Let us check the document once again −

> db.addMd5HashValueDemo.find();

This will produce the following output −

{ "_id" : ObjectId("5cd6a4c66d78f205348bc619"), "UserName" : "Adam", "UserPassword" : "Adam123456", "Value" : "6523857c2bf79b63fd5fa0322575f7be" }

{ "_id" : ObjectId("5cd6a4e46d78f205348bc61a"), "UserName" : "Chris", "UserPassword" : "Chris_121#", "Value" : "3391ccbe33624258cafa23aa50301615" }