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deno_mongo

deno_mongo is a MongoDB database driver developed for Deno. supports Deno Deploy as well.

ATTENTION

Deno have added the support for npm modules. so you can also use npm:mongodb driver from now.
Each of these two drivers has its own advantages and disadvantages. you can follow this issue for more details. In short:

• if you want to use basic MongoDB operations and you don't care about stability, this driver just works.
• if you want most of MongoDB feature working with Deno and you don't care about the possible overheads by using node compat layer, you may try the npm:mongodb driver
• if you are using MongoDB Atlas, using atlas_sdk can be your best option.

Links

• Docs

Import

Replace LATEST_VERSION with current latest version

import {
  Bson,
  MongoClient,
} from "https://deno.land/x/mongo@LATEST_VERSION/mod.ts";

Connect

const client = new MongoClient();

// Connecting to a Local Database
await client.connect("mongodb://127.0.0.1:27017");

// Connecting to a Mongo Atlas Database
await client.connect({
  db: "<db_name>",
  tls: true,
  servers: [
    {
      host: "<db_cluster_url>",
      port: 27017,
    },
  ],
  credential: {
    username: "<username>",
    password: "<password>",
    db: "<db_name>",
    mechanism: "SCRAM-SHA-1",
  },
});

// Connect using srv url
await client.connect(
  "mongodb+srv://<username>:<password>@<db_cluster_url>/<db_name>?authMechanism=SCRAM-SHA-1",
);

Access Collection

// Defining schema interface
interface UserSchema {
  _id: ObjectId;
  username: string;
  password: string;
}

const db = client.database("test");
const users = db.collection<UserSchema>("users");

Insert

const insertId = await users.insertOne({
  username: "user1",
  password: "pass1",
});

const insertIds = await users.insertMany([
  {
    username: "user1",
    password: "pass1",
  },
  {
    username: "user2",
    password: "pass2",
  },
]);

Find

const user1 = await users.findOne({ _id: insertId });

const all_users = await users.find({ username: { $ne: null } }).toArray();

// find by ObjectId
const user1_id = await users.findOne({
  _id: new ObjectId("SOME OBJECTID STRING"),
});

Count

const count = await users.countDocuments({ username: { $ne: null } });

const estimatedCount = await users.estimatedDocumentCount({
  username: { $ne: null },
});

Aggregation

const docs = await users.aggregate([
  { $match: { username: "many" } },
  { $group: { _id: "$username", total: { $sum: 1 } } },
]).toArray();

Update

const { matchedCount, modifiedCount, upsertedId } = await users.updateOne(
  { username: { $ne: null } },
  { $set: { username: "USERNAME" } },
);

const { matchedCount, modifiedCount, upsertedId } = await users.updateMany(
  { username: { $ne: null } },
  { $set: { username: "USERNAME" } },
);

Replace

const { matchedCount, modifiedCount, upsertedId } = await users.replaceOne(
  { username: "a" },
  {
    username: "user1",
    password: "pass1",
  }, // new document
);

Delete

const deleteCount = await users.deleteOne({ _id: insertId });

const deleteCount2 = await users.deleteMany({ username: "test" });

Cursor methods

const cursor = users.find();

// Skip & Limit
cursor.skip(10).limit(10);

// iterate results
for await (const user of cursor) {
  console.log(user);
}

// or save results to array (uses more memory)
const users = await cursor.toArray();

GridFS

// Upload
const bucket = new GridFSBucket(db);
const upstream = bucket.openUploadStream("test.txt");

const writer = upstream.getWriter();
writer.write(fileContents);

await writer.close();

// Download
const file = await new Response(bucket.openDownloadStream(id)).text();

Community Resources

Tools

• atlas_sdk TypeSafe MongoDB Atlas Data API SDK for Deno & Deno Deploy
• dangoDB A MongoDB ODM for Deno
• denomongo-unittest-utils mock mongo-collections for use in unit-tests

Examples

• deno-deploy-mongo A simple app with Deno, MongoDB and oak deployed on Deno Deploy and MongoDB Atlas
• deno_rest A simple oak based boilerplate for RESTful apis using deno_mongo

Contributing

Local testing with Docker

1. docker run -d -p 27017:27017 mongo
2. deno test -A