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MongoDB and Mongoose work out of the box with Bun. This guide assumes you’ve already installed MongoDB and are running it as background process/service on your development machine. Follow this guide for details.
Once MongoDB is running, create a directory and initialize it with bun init.
terminal
mkdir mongoose-app
cd mongoose-app
bun init
Then add Mongoose as a dependency.
terminal
bun add mongoose
In schema.ts we’ll declare and export a simple Animal model.
/icons/typescript.svgschema.ts
import * as mongoose from 'mongoose';

const animalSchema = new mongoose.Schema(
	{
		title: {type: String, required: true},
		sound: {type: String, required: true},
	},
	{
		methods: {
			speak() {
				console.log(`${this.sound}!`);
			},
		},
	},
);

export type Animal = mongoose.InferSchemaType<typeof animalSchema>;
export const Animal = mongoose.model('Animal', animalSchema);
Now from index.ts we can import Animal, connect to MongoDB, and add some data to our database.
/icons/typescript.svgindex.ts
import * as mongoose from 'mongoose';
import {Animal} from './schema';

// connect to database
await mongoose.connect('mongodb://127.0.0.1:27017/mongoose-app');

// create new Animal
const cow = new Animal({
	title: 'Cow',
	sound: 'Moo',
});
await cow.save(); // saves to the database

// read all Animals
const animals = await Animal.find();
animals[0].speak(); // logs "Moo!"

// disconnect
await mongoose.disconnect();
Let’s run this with bun run.
terminal
bun run index.ts

Moo!
This is a simple introduction to using Mongoose with TypeScript and Bun. As you build your application, refer to the official MongoDB and Mongoose sites for complete documentation.
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