Validate JSON Safely in JavaScript (Avoid False Positives)

Quick tip: If you’re validating JSON in JavaScript, always parse the original string using JSON.parse() inside a try/catch.

Avoid JSON.stringify() checks — they can give false positives.

Example:

try {
  JSON.parse(input);
} catch {
  // handle invalid JSON
}

I built a small browser-based tool to quickly validate JSON when debugging APIs:
https://jsonviewertool.com

Comments

[Avinash Verma]

This tip came from repeatedly debugging malformed API responses.
Curious if others have better patterns for large payloads.