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What Is JSON.

JSON, that is associate  signifier for JavaScript Object Notation, is one amongst the foremost widespread knowledge formats used for transmission data. it's a light-weight format and consists of name-value pairs. Values will be strings, arrays, or the other knowledge that may be serialised.

In the recent days XML was primarily used for interchanging knowledge, however since JSON appeared it's typically used as a replacement of XML. A JSON file ought to finish with the .json extension.

The "Unexpected token u in JSON at position 0" error happens after we pass an undefined value to the JSON.parse or $.parseJSON methods. to resolve the error, examine the worth you are attempting to break down and ensure it is a valid JSON string before parsing it.

Here's  example of however the error happens.

index.js

// ⛔️ SyntaxError: Unexpected token u in JSON at position 0
console.log(JSON.parse(undefined));

// ⛔️ SyntaxError: Unexpected token u in JSON at position 0
console.log($.parseJSON(undefined));

When an undefined value is passed to the JSON.parse method, it gets born-again to a string and therefore the 1st character within the string is that the letter u, that is what the error message suggests that.

There square measure multiple reasons the "Unexpected token u in JSON at position 0" error happens once calling JSON.parse:

✅Referencing a non-existent property on  object.

✅Your server or native storage decision is returning empty response.

✅You are taking data instantly because the page hundreds and inflicting a race condition.

✅To make positive you handle the error, place the JSON.parse call in a try/catch statement.

index.js

try {
  const result = JSON.parse(undefined);
} catch (err) {
  // 👇️ This runs
  console.log('Error: ', err.message);
}

The try block tries to break down the worth and assigns it to a variable. However, if the passed-in price isn't a sound JSON string, the error gets caught and handled in the catch block.

If you are taking data from a server, console.log the response you are obtaining and ensure it is a valid JSON string.

Does your server send a Content-Type header of application/json? Pass the worth to an on-line JSON validator and see if you get any errors.

If you are exploitation native storage, open your browser's console and clear the native storage because it generally glitches.

browser-console

localStorage.clear()

Now refresh the page and see if things work needless to say.

Also, once exploitation native storage and attempting to break down a JSON value, ensure you are writing a JSON value to native storage. If the worth is not already JSON, you've got to pass it to the JSON.stringify method.

index.js

// 👇️ Store a JSON value in local storage
localStorage.setItem('person', JSON.stringify({name: 'Tom'}));

// 👇️ parse the value when accessing it
const result = JSON.parse(localStorage.getItem('person'));

If you are reading knowledge from a file or taking data on the server instantly because the page hundreds, use window.onload or $(document).ready().

We create asking to the server once the DOM or window has loaded. This helps USA avoid any race conditions like attempting to break down a price before the DOM is absolutely loaded.

$(document).ready().

index.js

// ✅ using jQuery
$(document).ready(function () {
  $.getJSON('https://randomuser.me/api/', function (data) {
    console.log(data);
  });
});

// ✅ using fetch
window.onload = function getUser() {
  fetch('https://randomuser.me/api/')
    .then(response => {
      if (!response.ok) {
        throw new Error(`Error status: ${response.status}`);
      }

      return response.json();
    })
    .then(result => {
      console.log(result);
    })
    .catch(err => console.log(err));
};

In another example given below ---If you're using fetch()

Use this approach if your code looks something like this:

fetch('https://example.com/some/path/to/json')
.then(function (response) {
    return response.json();
})
.then(function (data) {
    // Do something with data
});

var responseClone; // 1
fetch('https://example.com/some/path/to/json')
.then(function (response) {
    responseClone = response.clone(); // 2
    return response.json();
})
.then(function (data) {
    // Do something with data
}, function (rejectionReason) { // 3
    console.log('Error parsing JSON from response:', rejectionReason, responseClone); // 4
    responseClone.text() // 5
    .then(function (bodyText) {
        console.log('Received the following instead of valid JSON:', bodyText); // 6
    });
});

Conclusion

The "Unexpected token u in JSON at position 0" error happens after we pass an undefined value to the JSON.parse or $.parseJSON methods. to resolve the error, examine the worth you are attempting to break down and ensure it is a valid JSON string before parsing it.

JSON is a particularly widespread format and is often used for data interchanging. we've got talked regarding what JSON is, and what we are able to do once a parsing error is thrown. For starters, forever control if the values you square measure|you're} coping with are what you expect them to be, and keep in mind, console.log() is your friend.