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Showing content from https://docs.microsoft.com/rest/api/documentdb/user-defined-functions below:

User Defined Functions - Azure Cosmos DB REST API

Azure Cosmos DB is a globally distributed multi-model database that supports the document, graph, and key-value data models. The content in this section is for managing user-defined function resources (udfs) using the SQL API via REST.

A user-defined function (UDF) is a side effect free piece of application logic written in JavaScript. It allows developers to construct a query operator, thus extending the core of the Cosmos DB query language. Like stored procedures, UDFs live in the confines of a collection, thus confining the application logic to the collection.

Similar to stored procedures, the UDFs resource has a fixed schema. The body property contains the application logic. The following example illustrates the JSON construct of a user-defined function.

{  
"id":"simpleTaxUDF",  
"body": "  
function tax(income) {  
        if(income == undefined)   
            throw 'no input';  
        if (income < 1000)   
            return income * 0.1;  
        else if (income < 10000)   
            return income * 0.2;  
        else  
            return income * 0.4;  
    }  
",  
"_rid":"hLEEAI1YjgcBAAAAAAAAgA==",  
"_ts":1408058682,  
"_self":"dbs\/hLEEAA==\/colls\/hLEEAI1Yjgc=\/udfs\/hLEEAI1YjgcBAAAAAAAAgA==\/",  
"_etag":"00004100-0000-0000-0000-53ed453a0000"  
}

Property Description id Required. It is a user settable property. It is a unique name to identify the UDF. The ID must not exceed 255 characters. body Required. It is a user settable property. It is the body of the UDF. _rid It is a system generated property. The resource ID (_rid) is a unique identifier that is also hierarchical per the resource stack on the resource model. It is used internally for placement and navigation of the UDF resource. _ts It is a system generated property. It specifies the last updated timestamp of the resource. The value is a timestamp. _self It is a system generated property. It is the unique addressable URI for the resource. _etag It is a system generated property that specifies the resource etag required for optimistic concurrency control. Tasks

You can do the following with user-defined functions:

For information on how UDFs work, including executing an UDF in a query, see Cosmos DB programming: Stored procedures, triggers, and UDFs.