The OpenWeatherMap API is displaying 'undefined' as a response

Question

The OpenWeatherMap API is displaying 'undefined' as a response

I've been encountering some issues with my weather app project due to lack of clarity in my previous questions. To be more specific, every time I attempt to retrieve weather information in JSON format using the fetch method, it keeps returning undefined. I'm building this app solely with pure vanilla JavaScript and utilizing Open Weather Map's API for data retrieval. I even tried switching to a different API (Free Weather API) but encountered the same issue with undefined responses. The websites themselves seem to be loading fine, leading me to believe that the problem lies within my code.

fetch('http://api.openweathermap.org/data/2.5/weather?q=Traralgon&appid=a211b9a621afd7714296d94616623dea&units=metric').then(function (response) {
    console.log('success!', response.main);
}).catch(function (err) {
    console.warn('Something went wrong.', err);
});

javascript json openweathermap

Answer 1

Answer №1

To effectively utilize the promise method, it is essential to manipulate the response and then transfer this modified data to the subsequent then function.

fetch(
    'http://api.openweathermap.org/data/2.5/weather?q=Traralgon&appid=a211b9a621afd7714296d94616623dea&units=metric'
  )
    .then(function (response) {
      return response.json();
    })
    .then(function (responseJSON) {
      console.log('success!', responseJSON.main);
    })
    .catch(function (err) {
      console.warn('Something went wrong.', err);
    });

For more information, visit: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise

Answer 2

To effectively utilize the promise method, it is essential to manipulate the response and then transfer this modified data to the subsequent then function.

fetch(
    'http://api.openweathermap.org/data/2.5/weather?q=Traralgon&appid=a211b9a621afd7714296d94616623dea&units=metric'
  )
    .then(function (response) {
      return response.json();
    })
    .then(function (responseJSON) {
      console.log('success!', responseJSON.main);
    })
    .catch(function (err) {
      console.warn('Something went wrong.', err);
    });

For more information, visit: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise

Answer 3

Answer №2

It is important to remember to utilize the json() method on the response object before performing any operations on the data. The json() method specifically takes a Response stream and reads it entirely, returning a promise. To handle the promise returned by response.json(), we should employ the .then() method. Once resolved, it parses the body text as JSON.

fetch('http://api.openweathermap.org/data/2.5/weather?q=Traralgon&appid=a211b9a621afd7714296d94616623dea&units=metric')
        .then(function (response) {
           // parsing the body of response object
            return response.json();
        })
        .then(function (response) {
            console.log('success', response.main);
        })
        .catch(function (err) {
            console.warn('Something went wrong.', err);
        });

Answer 4

It is important to remember to utilize the json() method on the response object before performing any operations on the data. The json() method specifically takes a Response stream and reads it entirely, returning a promise. To handle the promise returned by response.json(), we should employ the .then() method. Once resolved, it parses the body text as JSON.

fetch('http://api.openweathermap.org/data/2.5/weather?q=Traralgon&appid=a211b9a621afd7714296d94616623dea&units=metric')
        .then(function (response) {
           // parsing the body of response object
            return response.json();
        })
        .then(function (response) {
            console.log('success', response.main);
        })
        .catch(function (err) {
            console.warn('Something went wrong.', err);
        });

The OpenWeatherMap API is displaying 'undefined' as a response

Answer №1

Answer №2

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