How to work with a link that ends with "?a="?

Question

Express.js

Hello.

When I do this

app.get('/testa?a=:abc', (req, res) => {
    res.send(req.params.abc)
})

It doesn't work for me and I don't understand why.

I need to output from ?a= what I indicated in the link line, but the browser just gives me Cannot GET /testa

Answer 1

request.query