This error occurs when you try to parse an HTML document as JSON data. JSON is a lightweight data-interchange format and has a strict syntax, which requires a valid JSON string to start with either an object or an array. On the other hand, an HTML document starts with the <!DOCTYPE>
declaration followed by the <html>
tag, which is not a valid JSON syntax.
To resolve this error, make sure that the data you are parsing is in a valid JSON format. Check the source of the data and ensure that it is not an HTML document, but a valid JSON object or array. If you are trying to fetch data from a server, make sure that the server is returning a valid JSON response, and not an HTML document.
You can also use the try...catch
block to handle the error and provide a fallback in case the JSON parsing fails. For example:
javascripttry {
const data = JSON.parse(jsonString);
// Do something with the parsed data
} catch (e) {
console.log('Error parsing JSON:', e);
// Handle the error and provide a fallback
}
In this example, the try...catch
block is used to parse the jsonString
variable as JSON data. If the parsing is successful, the parsed data is stored in the data
variable. If an error occurs during parsing, the error is caught and logged to the console, and the code inside the catch
block is executed to handle the error and provide a fallback.
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