Fetch data with GET

Before working on CRUD operations, ensure your Node-RED environment is connected to your MongoDB database.

To build the GET method, we will need the following nodes:


Node	Description
http in	Listens to HTTP requests.
function	Allows to write custom JavaScript code to manipulate data passed through it.
mongodb in	Allows retrieving and manipulating data from a MongoDB collection.
http response	Replies to HTTP requests.

Note: To learn more about Node-RED nodes, refer to the chapter ../useful%20info/common_node_red_nodes.html.

Drag and drop the nodes onto the dashboard in the specified order:
To connect a node to the next one, click on the gray square on its right border and drag your mouse to the gray square on the left border of the next node. You will see a line linking the two nodes. Now, we are ready to configure each of the nodes.
http in

Double-click the node to open its properties. Set the method to GET and name the endpoint for your URL, then click Done.
function

Give your function a name to help you navigate your back-end.
To specify that you want to retrieve all the available data, set msg.payload to an empty object. You can do this by copying the following code into the beginning of the function's body:
```
msg.payload = {};
```
Your function should now look like this:
mongodb in

Enter the collection name and select find as the operation. Then, click on Done.
http response

Leave the node without any changes.
Deploy the service.

The API can now retrieve data from your database using the GET method.

To test your REST API, you can use a platform like Postman.