hsz.js

var request = require('request');

var headers = {
		'Content-Type': 'application/json'
};

var dataString = '{"contents":[{"parts":[{"text":"d"}]}]}';

var options = {
		url: 'https://generativelanguage.googleapis.com/v1beta/models/gemini-pro:generateContent?key=AIzaSyAueRCtlOkRXRvzexG9MaVB-t7PX8OpK7I',
		method: 'POST',
		headers: headers,
		body: {
			  contents: [
					{
						parts: [
							{
								text: "hello"
							}
						]
					}
				]
};

function callback(error, response, body) {
		if (!error && response.statusCode == 200) {
				console.log(JSON.parse(body).candidates[0].content);
		}
}

request(options, callback);