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Utilizar axios de forma asíncrona en React Native

Tiempo de lectura: < 1 minuto

En este artículo os voy a enseñar cómo utilizar axios de forma asíncrona en vuestros proyectos.

Partiendo del siguiente código para realizar una llamada GET con axios:

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EnlighterJS 3 Syntax Highlighter
axios.get("tu_url")
.then(resp=> {
alert(resp.data)
}).catch(error =>
alert(error)
);
axios.get("tu_url") .then(resp=> { alert(resp.data) }).catch(error => alert(error) );
       axios.get("tu_url")
            .then(resp=> {
               alert(resp.data)
            }).catch(error =>
               alert(error)
            );

Al utilizar la sentencia .then la APP se queda a la espera de cargar el resultado de forma síncrona.

Para cambiar la llamada a una llamada asíncrona hay que hacer la siguiente modificación:

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try {
const resp = await axios.get("tu_url")
alert(resp.data)
} catch (err) {
console.log(err)
}
try { const resp = await axios.get("tu_url") alert(resp.data) } catch (err) { console.log(err) }
          try {
            const resp = await axios.get("tu_url")
            alert(resp.data)
        } catch (err) {
            console.log(err)
        }
  1. Creamos un try/catch para ser capaces de recuperar los errores que puedan surgir al realizar la llamada.
  2. Creamos una constante (const) dónde se va a almacenar la respuesta de nuestro GET.
  3. Para ejecutar la llamada añadimos await delante de la función de axios.
  4. El sistema ejecutará en segundo plano la llamada await y devolverá la respuesta a la constante creada. Para ver el resultado añadimos un alert de ejemplo resp.data contendrá los datos del servidor REST.
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