How to Validate JSON Strings Without Using Try-Catch?

Validating JSON Strings Without Try/Catch

Verifying the validity of JSON strings is essential for robust data parsing in programming. This article presents a solution that leverages the JSON parser without resorting to the try/catch block, which can hinder debugging due to unintended interruptions.

Question:

How can we effectively check if a given string is a valid JSON string without using try/catch?

Answer:

Employ the JSON.parse() method, which attempts to parse the input string as a JSON object. If the operation succeeds, the method returns the parsed object, indicating a valid JSON string. Conversely, if parsing fails, an exception is thrown, indicating an invalid JSON string.

Code:

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

Examples:

• isJsonString('{ "Id": 1, "Name": "Coke" }') returns true, as the string represents a valid JSON object.
• isJsonString('foo') returns false, since 'foo' is not a valid JSON string.
• isJsonString('<div>foo</div>') also returns false, as it contains HTML tags and is not a valid JSON string.

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