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Showing content from https://www.mongodb.com/docs/atlas/app-services/reference/config/functions/ below:

Function Configuration Files - Atlas App Services

app/└── functions/    ├── config.json    └── <function>.js

Every function in your app has a corresponding metadata entry in the function manifest file: /functions/config.json.

Atlas App Services automatically adds functions to the manifest on import if they don't already have a configuration defined. If you're okay with the default settings, you can skip defining the configuration for a function and let App Services do it for you. The manifest will include the generated configurations the next time you export or pull your app.

[  {    "name": "<Function Name>",    "private": <Boolean>,    "can_evaluate": { <JSON Expression> },    "disable_arg_logs": <Boolean>,    "run_as_system": <Boolean>,    "run_as_user_id": "<App Services User ID>",    "run_as_user_id_script_source": "<Function Source Code>"  },  ...]

Field

Description

name

string

The name of the function. The name must match the file name of a source code file and be unique among all functions in your application.

private

boolean

If true, this function may only be called from other functions or in %function rule expressions. You cannot call a private function directly from a client application or with an SDK.

can_evaluate

object

A JSON expression that evaluates to true if the function is allowed to execute. App Services evaluates this expression for every incoming request.

disable_arg_logs

boolean

If true, App Services omits the arguments provided to the function from the function execution log entry.

run_as_system

boolean

If true, this function runs as the system user. This overrides any values defined for run_as_user_id and run_as_user_id_script_source.

run_as_user_id

string

The unique ID of a App Services User that the function always executes as. Cannot be used with run_as_user_id_script_source.

run_as_user_id_script_source

string

A stringified function that runs whenever the function is called and returns the unique ID of a App Services User that the function executes as. Cannot be used with run_as_user_id.

You define a function's source code in a .js file within the /functions directory that uses the function name as its file name. Each file must export the main function that runs whenever a request calls the function.

All of your function source code files must be in the /functions directory.

/functions/<function name>.js

exports = function addOne(input) {  if(typeof input !== "number") {    throw new Error("You must call addOne() with a number");  }  return input + 1;};

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