Obtaining Data from Fetch Response Instance

Question

Obtaining Data from Fetch Response Instance

Currently, I am utilizing the fetch method to execute API requests. While everything is functioning as expected, I have encountered a challenge with one specific API call due to the fact that it returns a string instead of an object.

Normally, the API provides an object from which I can extract the necessary information by parsing the JSON data. However, in this scenario, I am struggling to locate the text within the response object.

Upon examining the response object, it appears like this: https://i.sstatic.net/RapuG.png

I initially assumed that the text would be contained within the body of the response, but after searching extensively, I have not been able to find it. Where should I direct my attention next?

javascript ajax fetch-api

Answer 1

Answer №1

If you're looking to utilize the fetch JavaScript API, consider using this approach:

response.text().then(function (text) {
  // perform actions with the text response
});

For more details, check out the documentation on fetch > response > body interface methods

Answer 2

If you're looking to utilize the fetch JavaScript API, consider using this approach:

response.text().then(function (text) {
  // perform actions with the text response
});

For more details, check out the documentation on fetch > response > body interface methods

Answer 3

Answer №2

Modern JavaScript Example:

fetch("https://api.example.com/data")
   .then(response => response.json())
   .then((data) => {
       console.log(data)
   })
   .catch(err => console.error(err))

Answer 4

Modern JavaScript Example:

fetch("https://api.example.com/data")
   .then(response => response.json())
   .then((data) => {
       console.log(data)
   })
   .catch(err => console.error(err))

Answer 5

Answer №3

There are two methods to achieve this:

The initial approach involves using the response.text() method: (caniuse, mdn)

async function fetchTest() {
    let response = await fetch('https://httpbin.org/encoding/utf8');
    let responseText = await response.text();

    document.getElementById('result').innerHTML = responseText;
}

(async() => {
    await fetchTest();
})();

<div id="result"></div>

An alternative method is to utilize the response.body property, albeit with additional steps: (caniuse, mdn)

async function fetchTest() {
    let response = await fetch('https://httpbin.org/encoding/utf8');
    let responseText = await getTextFromStream(response.body);
    
    document.getElementById('result').innerHTML = responseText;
}

async function getTextFromStream(readableStream) {
    let reader = readableStream.getReader();
    let utf8Decoder = new TextDecoder();
    let nextChunk;
    
    let resultStr = '';
    
    while (!(nextChunk = await reader.read()).done) {
        let partialData = nextChunk.value;
        resultStr += utf8Decoder.decode(partialData);
    }
    
    return resultStr;
}

(async() => {
    await fetchTest();
})();

<div id="result"></div>

Answer 6

There are two methods to achieve this:

The initial approach involves using the response.text() method: (caniuse, mdn)

async function fetchTest() {
    let response = await fetch('https://httpbin.org/encoding/utf8');
    let responseText = await response.text();

    document.getElementById('result').innerHTML = responseText;
}

(async() => {
    await fetchTest();
})();

<div id="result"></div>

An alternative method is to utilize the response.body property, albeit with additional steps: (caniuse, mdn)

async function fetchTest() {
    let response = await fetch('https://httpbin.org/encoding/utf8');
    let responseText = await getTextFromStream(response.body);
    
    document.getElementById('result').innerHTML = responseText;
}

async function getTextFromStream(readableStream) {
    let reader = readableStream.getReader();
    let utf8Decoder = new TextDecoder();
    let nextChunk;
    
    let resultStr = '';
    
    while (!(nextChunk = await reader.read()).done) {
        let partialData = nextChunk.value;
        resultStr += utf8Decoder.decode(partialData);
    }
    
    return resultStr;
}

(async() => {
    await fetchTest();
})();

<div id="result"></div>

Obtaining Data from Fetch Response Instance

Answer №1

Answer №2

Answer №3

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