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Showing content from https://www.mongodb.com/docs/atlas/device-sdks/sdk/node/app-services/call-a-function/ below:

Call a Function - Node.js SDK - Atlas Device SDKs

The examples in this section demonstrate calling a simple Atlas Function named sum that takes two arguments, adds them, and returns the result:

exports = function(a, b) {  return a + b;};

Make sure to sanitize client data to protect against code injection when using Functions.

To call a function, you can either pass its name and arguments to User.callFunction() or call the function as if it was a method on the User.functions property.

This example requires an App Services App with a linked Atlas data source. Replace <appId> in the code with your App ID, which you can find in the left navigation menu of the App Services UI.

const numA = 2;const numB = 3;const result = await user.functions.sum(numA, numB);const resultOfCallFunction = await user.callFunction("sum", numA, numB); console.log(  `Using the "functions.sum()" method: the sum of ${numA} + ${numB} = ${result}`);console.log(  `Using the "callFunction()" method: the sum of ${numA} + ${numB} = ${resultOfCallFunction}`);

When you run the code sample, your output should resemble the following:

Using the "functions.sum()" method: the sum of 2 + 3 = 5Using the "callFunction()" method: the sum of 2 + 3 = 5

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