# MongoDB
## 1. How to connect to MongoDB?
Acho allows you to connect to MongoDB database. You can follow the steps below to set up the connection. Go to the **Resources** page and click the **Add Resource** button
2\. In the "Select a data source" step, select **MongoDB** under the **Database** tab
3\. In the "Configure the data source" step, enter your database login credentials:
* **`Database`**: your database name.
* **`User`**: the username used for connecting to your database.
* **`Password`**: the password used for authenticating the connection.
* **`TLS Connection`**: whether to use TLS connection.
* **`Authentication Source`**: specifies the database that the supplied credentials should be validated against. The default value is "admin".
* **`MongoDb Instance Type`**: Acho supports three instance types:
* **Standalone MongoDB instance**
* Host: URL of the database
* Port: Port to use for connecting to the database
* **Replica Set**
* Server addresses: the members of a replica set
* Replica Set: A replica set name
* **MongoDB Atlas Cluster:** it can be a little tricky if you are not familiar with MongoDB's connection string. Here is an example breaking down components in a MongoDB SRV connection string:
* Database: db-name
* User: username
* Password: password
* Cluster URL: URL of a cluster to connect to (rs.joedrumgoole.com in this example)
{% hint style="info" %}
Note: remember to add Acho's IP address, **`35.239.14.24`**, to your [whitelist](#3.-how-to-add-achos-ip-into-your-whitelist) before starting the connection.
{% endhint %}
4\. In the "Select the tables", choose tables that you want to import.
5\. Click **Finish Setup**. You will see a 
icon next to your MongoDB resource. It may take a few minutes to several hours depending on the data size and the number of your tables. Once your APP's data is ready, you will receive a notification email.
## 2. How to set up Data Sync?
Acho supports creating schedulers to retrieve the latest data from your database at a certain time interval. To see more details, you can visit [here](https://docs.acho.io/data-sync/untitled).
## 3. How to add Acho's IP into your whitelist?
You should whitelist our service IP address `35.239.14.244` . This way we can make a connection to your database and import the tables to **Acho Studio**. Here is how you can whitelist Acho's service IP address for your database instance. (Take MongoDB Atlas as an example).
1\. Go to your MongoDB Atlas and navigate to **Network Access**
2\. Click on **ADD IP ADDRESS**, and enter **`35.239.14.244`** in **Access List Entry** as shown below
{% hint style="info" %}
If you need to input an IP range, just enter**`35.239.14.244`**
{% endhint %}
3\. Click **Confirm**
