Send post parameter to restify

I'm trying to send parameter to nodejs with restify, but it's always getting undefined

I'm sending more or less like this:

$.ajax({
       url : 'http://localhost:8080/api',
       type: 'post',
       dataType: 'json',
       data: {
            ano : ano
        }    
     })

And on the node I'm getting like this:

server.post('/api/temp/anual', async (req, res, next) =>{

        try{
            const { ano } =  req.params
            console.log( ano )
            res.send( await db.medicao().anual( ano ) )
            next()
        }catch (error) {
            res.send(error)
            next()
        }
    })

Only the value always comes as undefined

If I try for postman it's okay