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React is a free and open-source front-end JavaScript library for building user interfaces based on UI components. It is maintained by Meta and a community of individual developers and companies.
When you try to do anything automated in this tool, the following error message appears: “To Solve undefined “parsererror” “SyntaxError: Unexpected token < in JSON at position 0 Error“.
Don’t worry too much. This article will help all readers resolve these issues with this well-known program.
When Would The Error “To Solve undefined “parsererror” “SyntaxError: Unexpected token < in JSON at position 0 Error” Happen?
You have a simple function that makes API calls and sets data, but you are getting this error.
undefined "parsererror" "SyntaxError: Unexpected token < in JSON at position 0
Here is an example of an API call function.
getUserData : function getUserData() {
$.ajax({
url: this.props.url,
dataType: 'json',
success: function (data) {
this.setState({ data: data });
}.bind(this),
error: function (xhr, status, err) {
console.error(this.props.url, status, err.toString());
}.bind(this)
});
},
The Top Three Techniques
To resolve this fundamental issue, you can use the syntax described below.
Method 1
You are having this problem. And by removing the dataType:’json’ from the $.ajax method, your problem was resolved.
Method 2
You were gaining the above webpack running, and it transformed into another corruption somewhere else in the native node modules dir, which was enough to have it functioning again.
rm -rf node_modules
npm install
Method 3
You are getting XML or HTML from your server, but the dataType: json tells jQuery to decode it as JSON. Now, you need to inspect the “Network” tab in Chrome dev tool kits to see the section of the site’s reply.
Conclusion
ReactJS is one open-source JavaScript library designed by Facebook to help design faster, more powerful, and more attractive UI web interfaces. ReactJS is a new technology that many programmers learn, and high recruitment demand with a salary of thousands of dollars.
In summary, the three approaches presented above are simple solutions to the aforementioned major error: “To Solve undefined “parsererror” “SyntaxError: Unexpected token < in JSON at position 0 Error“.
Please leave your questions in the comment so that our team can check them. I wish you all a fruitful day with our ReactJs tool.
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