Multiple query parameters with same name

Question

I want to know how does EXPRESS parse multiple query parameters with the same name; I couldn't find any useful reference anywhere. I want to know specifically about EXPRESS, how is it going to treat this URL www.example.com/page?id=1&id=2&id=3.....id=n

Answer 1

You can use the usual req.query. Whenever there's multiple query parameters with the same name, req.query[paramName] will return an array instead of the value. So in your case:

app.get("/page", (req, res) => {
    const { id } = req.query
    console.log("ID is "+ id) 
});

// GET www.example.com/page?id=1&id=2&id=3
// ID is ["1", "2", "3"]

// GET www.example.com/page?id=12345
// ID is 12345