I have seen the others questions about this topic, but my problem is slightly different: I have an axios call inside the .then of another axios call, and then I take values from the API that I called with axios and in another .then I render an ejs page, but the first time I execute, it tries to render the page before axios calling are completed, so variable to build the page are undefined, in particular it prints the error 'h1 is undefined' and h1 is the first variable in the ejs document after nameCapitalized which, as you can see from the code, is form the request and not from the axios api call; from the second time it works perfectly, when it works, it prints in order the console.log statements in .then, so the execution order is right, at least from the second execution. This get request is made after clicking a link in the browser.

Here the code:

app.get('/private_:city/', function(req, response) {
        const name = req.params.city;
        const nameCapitalised = name.charAt(0).toUpperCase() + name.slice(1).toLowerCase();
        let lat;
        let lon;
        let country;
        let jsonObj;
        let h1;
        let w1;
        let t1;
        let uv1;
        let rp1;
        let ws1;
    
        axios.get(`http://api.openweathermap.org/geo/1.0/direct?q=${nameCapitalised}&limit=1&appid=${apiKeyOpenWeather}`)
            .then(res => {
                console.log('first');
                lat = res.data[0].lat;
                lon = res.data[0].lon;
                country = res.data[0].country;
                console.log(res.data[0]);
                axios.get(`https://api.openweathermap.org/data/2.5/onecall?lat=${lat}&lon=${lon}&exclude=daily,minutely&units=metric&lang=it&appid=${apiKeyOpenWeather}`)
                    .then(res => {
                        console.log('second');
                        jsonObj = res.data;
                        h1 = new Date(jsonObj.hourly[0].dt * 1000).getHours();
                        w1 = jsonObj.hourly[0].weather[0].description;
                        t1 = jsonObj.hourly[0].temp;
                        uv1 = jsonObj.hourly[0].uvi;
                        rp1 = Math.trunc(jsonObj.hourly[0].pop * 100);
                        ws1 = jsonObj.hourly[0].wind_speed;
                    })
                    .then(res => {
                        console.log('third');
                        response.render('private.ejs', {
                            title: nameCapitalised,
                            t1: t1,
                            h1: h1,
                            w1: w1,
                            uv1: uv1,
                            rp1: rp1,
                            ws1: ws1,
                        });
                    });
            });
    });