Fix: ExperimentalWarning: Importing JSON modules error

The ‘ExperimentalWarning: Importing JSON modules’ error occurs when importing JSON files in ES modules, as JSON module imports are still experimental in Node.js and require explicit enabling.

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How the Error Happens

❌ Error Scenario:

// ❌ This causes the warning
import config from './config.json'; // ExperimentalWarning: Importing JSON modules is an experimental feature

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✅ Quick Fix - Handle JSON Imports Properly

Solution 1: Use Dynamic Import with Assertions

// ✅ Import JSON with type assertion
const config = await import('./config.json', { assert: { type: 'json' } });
console.log(config.default); // ✅ Access the JSON data

Solution 2: Use fs.promises.readFile

// ✅ Read JSON files using fs
import { readFile } from 'fs/promises';
import { fileURLToPath } from 'url';
import { dirname, join } from 'path';

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

const configPath = join(__dirname, 'config.json');
const config = JSON.parse(await readFile(configPath, 'utf8'));
console.log(config);

Solution 3: Use require() in ES Modules

// ✅ Use require for JSON in ES modules
import { createRequire } from 'module';
const require = createRequire(import.meta.url);

const config = require('./config.json');
console.log(config);

Solution 4: Enable JSON Modules (Experimental)

# ✅ Run with JSON modules enabled
node --experimental-json-modules app.js

// ✅ Then you can import JSON directly (still experimental)
import config from './config.json' assert { type: 'json' };
console.log(config);