Q:

Azure Cosmos DB SQL Like, prepared statements

Does the Azure Cosmos DB SQL Like API provide the equivalent of prepared statements to avoid SQL injection?  The quick start example to do not cover that and I seems to find no documentation on that topic. 

A:

If I understand the question correctly you just need to use the SDK method to call the query with parameters. 
{
    "query": "SELECT * FROM Families f WHERE f.lastName = @lastName AND f.address.state = @addressState",
    "parameters": [
        {"name": "@lastName", "value": "Wakefield"},
        {"name": "@addressState", "value": "NY"},
    ]
}

or maybe you are talking about stored procedures?