filter_post.js

router.get('/posts',authenticate, async (req,res) => {
    //const _ispublished = req.query.published;
    const match = {}

    if(req.query.published){
        match.published = req.query.published === 'true'
    }
    try {
        await req.user.populate({
            path:'posts',
            match
        }).execPopulate()
        res.send(req.user.posts)
    } catch (error) {
        res.status(500).send()
    }
})