Validate JSON and Print Errors

Node.js

Technical Specification

Create a script that tries to parse a JSON file and reports whether it is valid or prints the parse error.

Input/Output Samples

Input:node validate.js broken.json

Output:Invalid JSON: Unexpected token ...

Optimal Logic Path

const fs = require("fs");

const file = process.argv[2];
if (!file) {
  console.error("Usage: node validate.js <file>");
  process.exit(1);
}
try {
  const text = fs.readFileSync(file, "utf8");
  JSON.parse(text);
  console.log("Valid JSON");
} catch (err) {
  console.error("Invalid JSON:", err.message);
  process.exit(1);
}

Architectural Deep-Dive

We catch parse errors and make it easy to validate JSON config or data files.