How to use a variable as a field name in mongodb-native findOne()?

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You need to set the key of the query object dynamically:

var name = req.params.name;
var value = req.params.value;
var query = {};
query[name] = value;
collection.findOne(query, function (err, item) { ... });

When you do {name: value}, the key is the string 'name' and not the value of the variable name.

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