Node Express serverRangeError: Invalid status code: 0

Question

I am having an issue where I am getting the following error code when attempting a POST request on this application (bearing in mind I am a beginner node.js/js programmer):

Error:

[20:22:28] [nodemon] starting `node app.js`
Running server on 3000
Mon, 27 Jun 2016 19:22:31 GMT express deprecated res.send(status, body): Use res.status(status).send(body) instead at routes\edit.js:35:25
c:\Users\Matt\WebstormProjects\ghs_restart\node_modules\mongodb\lib\utils.js:98
    process.nextTick(function() { throw err; });
                                  ^

RangeError: Invalid status code: 0
    at ServerResponse.writeHead (_http_server.js:192:11)
    at ServerResponse._implicitHeader (_http_server.js:157:8)
    at ServerResponse.OutgoingMessage.end (_http_outgoing.js:573:10)
    at ServerResponse.send (c:\Users\Matt\WebstormProjects\ghs_restart\node_modules\express\lib\response.js:204:10)
    at ServerResponse.json (c:\Users\Matt\WebstormProjects\ghs_restart\node_modules\express\lib\response.js:249:15)
    at ServerResponse.send (c:\Users\Matt\WebstormProjects\ghs_restart\node_modules\express\lib\response.js:151:21)
    at c:\Users\Matt\WebstormProjects\ghs_restart\routes\edit.js:35:25
    at c:\Users\Matt\WebstormProjects\ghs_restart\node_modules\mongodb\lib\collection.js:416:18
    at handleCallback (c:\Users\Matt\WebstormProjects\ghs_restart\node_modules\mongodb\lib\utils.js:96:12)
    at c:\Users\Matt\WebstormProjects\ghs_restart\node_modules\mongodb\lib\collection.js:705:5

edit.js:

var express = require('express');

var router = express.Router();

var app = express();

var bodyParser = require('body-parser');
app.use( bodyParser.json() );       // to support JSON-encoded bodies
app.use(bodyParser.urlencoded({     // to support URL-encoded bodies
    extended: true
}));

var path = require('path');

var port = process.env.PORT || 3000;

var index = require('./routes/index');
var edit = require('./routes/edit');

app.use('/', index);
app.use('/edit', edit);

app.use(express.static(path.join(__dirname, 'public')));

app.set('view engine', 'jade');

app.set('views', 'views');

app.listen(port, function (err) {
    console.log("Running server on", port);
});

module.exports = index;

Answer 1

I had a similar error message just now and managed to solve the problem by changing:

res.status(statusCode);

to:

if (statusCode >= 100 && statusCode < 600)
  res.status(statusCode);
else
  res.status(500);

or just:

res.status(statusCode >= 100 && statusCode < 600 ? err.code : 500);

I.e. make sure you aren't trying to set an invalid HTTP status code somewhere.

It's likely this is the issue but it looks like you've accidentally duplicated the app.js code instead of pasting the edit.js code in the question.