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---
name: Read and write data to MongoDB using Mongoose and Bun
---
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](https://www.mongodb.com/docs/manual/installation/) for details.
---
Once MongoDB is running, create a directory and initialize it with `bun init`.
```bash
mkdir mongoose-app
cd mongoose-app
bun init
```
---
Then add Mongoose as a dependency.
```bash
bun add mongoose
```
---
In `schema.ts` we'll declare and export a simple `Animal` model.
```ts#schema.ts
import * as mongoose from 'mongoose';
const animalSchema = new mongoose.Schema(
{
name: {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.
```ts#index.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({
name: '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`.
```bash
$ 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](https://docs.mongodb.com/) and [Mongoose](https://mongoosejs.com/docs/) sites for complete documentation.
|
