app.post('', (req, res) => { pool.getConnection((err, connection) => { if (err) throw err console.log('connected as id' + connection.threadID) const params = req.body var name = params.name var tagline = params.tagline var description = params.description var image = params.image connection.query('INSERT INTO beers (name, tagline, description, image) VALUES (name,tagline,description,image)', (err, rows) => { connection.release() if (!err) { res.send('Successfully added record of name' + params.name) } else { console.log(err) } }) console.log(req.body) }) })Como sugirió @derpirscher, debe agregar los valores de los parámetros a la consulta.
Intenta cambiar tu código así:
const { name, tagline, description, image } = req.body.params; connection.query( 'INSERT INTO beers (name, tagline, description, image) VALUES (?, ?, ?, ?)', [name, tagline, description, image], (err, rows) => { connection.release(); if (!err) { res.send('Successfully added record of name' + params.name); } else { console.log(err); } } );