82041542e3
This PR fixes 2 issues with the mongodb example: ### 1. Fallable Caching Strategy Calling `connectToDatabase()` multiple times before it's cached results in multiple connections being created. The latest one created was becoming the "cached" one and the others dissappear into the background. This is now fixed by using **promise sharing** so that only one connection can ever be created. ### 2. Problematic Hot Reload During development you can monitor your database connections and see that it continues to create more and more connections over time. Some users have reported their [databases reaching maximum connection limits](https://github.com/vercel/next.js/discussions/12229). This is resolved by using `global` to store the cached connection. It's not ideal but it is necessary. |
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Example app using MongoDB
MongoDB is a general purpose, document-based, distributed database built for modern application developers and for the cloud era. This example will show you how to connect to and use MongoDB as your backend for your Next.js app.
If you want to learn more about MongoDB, visit the following pages:
Deploy your own
Once you have access to the environment variables you'll need, deploy the example using Vercel:
How to use
Execute create-next-app with npm or Yarn to bootstrap the example:
npx create-next-app --example with-mongodb with-mongodb
# or
yarn create next-app --example with-mongodb with-mongodb
Configuration
Set up a MongoDB database
Set up a MongoDB database either locally or with MongoDB Atlas for free.
Set up environment variables
Copy the env.local.example file in this directory to .env.local (which will be ignored by Git):
cp .env.local.example .env.local
Set each variable on .env.local:
MONGODB_URI- Your MongoDB connection string. If you are using MongoDB Atlas you can find this by clicking the "Connect" button for your cluster.MONGODB_DB- The name of the MongoDB database you want to use.
Run Next.js in development mode
npm install
npm run dev
# or
yarn install
yarn dev
Your app should be up and running on http://localhost:3000! If it doesn't work, post on GitHub discussions.
You will either see a message stating "You are connected to MongoDB" or "You are NOT connected to MongoDB". Ensure that you have provided the correct MONGODB_URI and MONGODB_DB environment variables.
When you are successfully connected, you can refer to the MongoDB Node.js Driver docs for further instructions on how to query your database.
Deploy on Vercel
You can deploy this app to the cloud with Vercel (Documentation).
Deploy Your Local Project
To deploy your local project to Vercel, push it to GitHub/GitLab/Bitbucket and import to Vercel.
Important: When you import your project on Vercel, make sure to click on Environment Variables and set them to match your .env.local file.
Deploy from Our Template
Alternatively, you can deploy using our template by clicking on the Deploy button below.