How Can I Reliably Check if a String is Valid JSON Without Using try/catch?

Checking the Validity of JSON Strings

Determining whether a string represents a valid JSON structure is crucial for various web development scenarios. In this article, we'll explore a reliable method to ascertain JSON string validity without resorting to try/catch blocks.

To evaluate a string as a valid JSON string, you can leverage the JSON.parse() function. This function attempts to parse the string into a JavaScript object. If the parsing succeeds, it indicates that the string is a valid JSON string. Otherwise, it throws an error.

The following code snippet implements this approach:

function isJsonString(str) {
    try {
        JSON.parse(str);
        return true;
    } catch (e) {
        return false;
    }
}

Examples:

Using this function, we can verify the validity of various strings:

isJsonString('{ "Id": 1, "Name": "Coke" }'); // true
isJsonString('foo'); // false
isJsonString('<div>foo</div>'); // false

This method provides an efficient and reliable way to validate JSON strings, allowing you to proceed with data processing or other operations based on the validity of the input string.

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