Is there a way to use a variable for the field name in a find() in mongoose?

Just put the variable in []

function foo (field, value){
    Model.find({[field]: value});
}

foo('idfoo', 'xx');
foo('idbar', 5);

You could use the built in where function, making the call to the function you've shown unnecessary:

Model.find().where(fieldName, value).exec(function(err, results) { });

And you could do more than one via chaining:

Model.find().where(field1, val1).where(field2, val2).exec(...)

It also can be rich, supporting nested properties and other operators:

Model.find().where('orders.total').gt(1500).exec(...)

function foo(field, value) {
  var query = {};
  query[field] = value;
  Model.find(query)...
}

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