In the node http module there is a localAddress option for binding to specific network interface.
var http = require('http');
var options = {
hostname: 'www.example.com',
localAddress: '202.1.1.1'
};
var req = http.request(options, function(res) {
res.on('data', function (chunk) {
console.log(chunk.toString());
});
});
Check out Mikeal's Request on Github.
Tor uses SOCKS5 and these two modules can help: socks5-http-client and socks5-https-client
require('socks5-http-client').request(options, function(res) {
console.log('STATUS: ' + res.statusCode);
console.log('HEADERS: ' + JSON.stringify(res.headers));
res.setEncoding('utf8');
res.on('data', function (chunk) {
console.log('BODY: ' + chunk);
});
});
Another option is to use a free web proxy, such as the Hide My Ass web proxy. They also provide a list of ip:port proxies which you can use. Both http, https and even SOCKS4/5. Either use the above modules or simply configure your web browser to use one of them.
You could even setup your own private http proxy node app and deploy on Heroku. I found a ton of easy to follow examples on Google.