[node.js] Route.get() requires callback functions but got a "object Undefined"

My suggestion, if you are still using const XXX = require('library or path./') when using module.exports to export multiple functions use an ES6 arrow function

for example:

module.exports = () => {

const  getPosts = (req, res ) =>{
    res.send('THIS WORKS!');
}

const getPost = async (req, res) => { 
    const { id } = req.params;

    try {
        const post = await PostMessage.findById(id);
        
        res.status(200).json(post);
    } catch (error) {
        res.status(404).json({ message: error.message });
    }
}

}

then Import: const getPosts = require('../controllers/posts.js');

Hope this helps... Cheers! www.miyamotto.net

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