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module.exports vs exports in Node

You can export functions and values from a module by either using 

module.exports:

module.exports = { value1, function1 }

or by using exports:

exports.value1 = value1
exports.function1 = function1
So what's the difference?
Exporting values with just the exports keyword is a quick way to export values from a module. You can use this keyword at the top or bottom, and all it does is populate the module.exports object. But if you're using exports in a file, stick to using it throughout that file.
Using module.exports is a way of explicitly specifying a module's exports. And this should ideally only exist once in a file. If it exists twice, the second declaration reassigns the module.exports property, and the module only exports what the second declaration states.
So as a solution to the previous code, you either export like this:
// ...
exports.value1 = value1

// ...
exports.function1 = function1

or like this:
// ...
module.exports = { value1, function1 }
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