What could be causing this heroku crash? error code=H10 - express

Question

I've looked over past posts on this question and many suggest heroku restart, or restarting dynos, or making sure to use var PORT = process.env.PORT || 3000. I have done all of these, but my app still crashes. The app runs using node/express sequelize / auth0.
Does any one have any suggestions? Thanks!
Here are the logs:
2017-09-08T02:11:37.293051+00:00 app[web.1]: at emitOne
(events.js:96:13)
2017-09-08T02:11:37.293052+00:00 app[web.1]: at Socket.emit
(events.js:188:7)
2017-09-08T02:11:37.293053+00:00 app[web.1]: at emitErrorNT
(net.js:1277:8)
2017-09-08T02:11:37.293054+00:00 app[web.1]: at
_combinedTickCallback (internal/process/next_tick.js:80:11)
2017-09-08T02:11:37.293055+00:00 app[web.1]: at
process._tickCallback (internal/process/next_tick.js:104:9)
2017-09-08T02:11:37.364314+00:00 heroku[web.1]: State changed from
starting to crashed
2017-09-08T02:11:37.353673+00:00 heroku[web.1]: Process exited with
status 0
2017-09-08T02:11:49.712881+00:00 heroku[router]: at=error code=H10
desc="App crashed" method=GET path="/" host=roadie2.herokuapp.com
request_id=79e0bc3a-aa28-44bb-ab80-cfcf4f6cd97d fwd="99.92.51.34"
dyno= connect= service= status=503 bytes= protocol=https
2017-09-08T02:11:50.564503+00:00 heroku[router]: at=error code=H10
desc="App crashed" method=GET path="/favicon.ico"
host=roadie2.herokuapp.com request_id=c72e5077-494c-41f5-8be1-
f0c2c329d080 fwd="99.92.51.34" dyno= connect= service= status=503
bytes= protocol=https
2017-09-08T02:12:24.838901+00:00 heroku[router]: at=error code=H10
desc="App crashed" method=GET path="/" host=roadie2.herokuapp.com
request_id=ca551858-5372-40c9-abf1-670176b159dc fwd="99.92.51.34"
dyno= connect= service= status=503 bytes= protocol=https
2017-09-08T02:12:25.340624+00:00 heroku[router]: at=error code=H10
desc="App crashed" method=GET path="/favicon.ico"
host=roadie2.herokuapp.com request_id=c37b876d-5a59-40d0-9d59-
9be013c58d94 fwd="99.92.51.34" dyno= connect= service= status=503
bytes= protocol=https
Here is the last part of what results after entering heroku logs --tail
2017-09-08T02:11:27.589912+00:00 heroku[web.1]: State changed from
crashed to starting
2017-09-08T02:11:29.599921+00:00 heroku[web.1]: Starting process with
command `npm start`
2017-09-08T02:11:32.504222+00:00 app[web.1]:
2017-09-08T02:11:32.504242+00:00 app[web.1]: > 15.2#1.0.0 start /app
2017-09-08T02:11:32.504243+00:00 app[web.1]: > node server.js
2017-09-08T02:11:32.504243+00:00 app[web.1]:
2017-09-08T02:11:33.199936+00:00 app[web.1]: Unhandled rejection
SequelizeConnectionRefusedError: connect ECONNREFUSED 127.0.0.1:3306
2017-09-08T02:11:33.199952+00:00 app[web.1]: at
Handshake._callback
(/app/node_modules/sequelize/lib/dialects/mysql/connection-
manager.js:80:20)
2017-09-08T02:11:33.199953+00:00 app[web.1]: at
Protocol.handleNetworkError
(/app/node_modules/mysql/lib/protocol/Protocol.js:364:14)
2017-09-08T02:11:33.199953+00:00 app[web.1]: at
Connection._handleNetworkError
(/app/node_modules/mysql/lib/Connection.js:428:18)
2017-09-08T02:11:33.199954+00:00 app[web.1]: at emitOne
(events.js:96:13)
2017-09-08T02:11:33.199952+00:00 app[web.1]: at
Handshake.Sequence.end
(/app/node_modules/mysql/lib/protocol/sequences/Sequence.js:86:24)
2017-09-08T02:11:33.199954+00:00 app[web.1]: at Socket.emit
(events.js:188:7)
2017-09-08T02:11:33.199955+00:00 app[web.1]: at emitErrorNT
(net.js:1277:8)
2017-09-08T02:11:33.199956+00:00 app[web.1]: at
_combinedTickCallback (internal/process/next_tick.js:80:11)
2017-09-08T02:11:33.199956+00:00 app[web.1]: at
process._tickCallback (internal/process/next_tick.js:104:9)
2017-09-08T02:11:33.302346+00:00 heroku[web.1]: State changed from
starting to crashed
2017-09-08T02:11:33.305267+00:00 heroku[web.1]: State changed from .
crashed to starting
2017-09-08T02:11:33.286200+00:00 heroku[web.1]: Process exited with .
status 0
2017-09-08T02:11:34.845606+00:00 heroku[web.1]: Starting process with
command `npm start`
2017-09-08T02:11:36.543285+00:00 app[web.1]:
2017-09-08T02:11:36.543298+00:00 app[web.1]: > 15.2#1.0.0 start /app
2017-09-08T02:11:36.543299+00:00 app[web.1]: > node server.js
2017-09-08T02:11:36.543299+00:00 app[web.1]:
2017-09-08T02:11:37.293030+00:00 app[web.1]: Unhandled rejection .
SequelizeConnectionRefusedError: connect ECONNREFUSED 127.0.0.1:3306
2017-09-08T02:11:37.293048+00:00 app[web.1]: at
Handshake._callback .
(/app/node_modules/sequelize/lib/dialects/mysql/connection-
manager.js:80:20)
2017-09-08T02:11:37.293049+00:00 app[web.1]: at
Handshake.Sequence.end
(/app/node_modules/mysql/lib/protocol/sequences/Sequence.js:86:24)
2017-09-08T02:11:37.293049+00:00 app[web.1]: at .
Protocol.handleNetworkError
(/app/node_modules/mysql/lib/protocol/Protocol.js:364:14)
2017-09-08T02:11:37.293050+00:00 app[web.1]: at
Connection._handleNetworkError
(/app/node_modules/mysql/lib/Connection.js:428:18)
2017-09-08T02:11:37.293051+00:00 app[web.1]: at emitOne
(events.js:96:13)
2017-09-08T02:11:37.293052+00:00 app[web.1]: at Socket.emit
(events.js:188:7)
2017-09-08T02:11:37.293053+00:00 app[web.1]: at emitErrorNT
(net.js:1277:8)
2017-09-08T02:11:37.293054+00:00 app[web.1]: at
_combinedTickCallback (internal/process/next_tick.js:80:11)
2017-09-08T02:11:37.293055+00:00 app[web.1]: at
process._tickCallback (internal/process/next_tick.js:104:9)
2017-09-08T02:11:37.364314+00:00 heroku[web.1]: State changed from
starting to crashed
2017-09-08T02:11:37.353673+00:00 heroku[web.1]: Process exited with .
status 0
2017-09-08T02:11:49.712881+00:00 heroku[router]: at=error code=H10 .
desc="Appcrashed" method=GET path="/" host=roadie2.herokuapp.com
request_id=79e0bc3a-aa28-44bb-ab80-cfcf4f6cd97d fwd="99.92.51.34"
dyno= connect= service= status=503 bytes= protocol=https
2017-09-08T02:11:50.564503+00:00 heroku[router]: at=error code=H10
desc="Appcrashed" method=GET path="/favicon.ico"
host=roadie2.herokuapp.com request_id=c72e5077-494c-41f5-8be1-
f0c2c329d080 fwd="99.92.51.34" dyno= connect= service= status=503
bytes= protocol=https
2017-09-08T02:12:24.838901+00:00 heroku[router]: at=error code=H10 .
desc="Appcrashed" method=GET path="/" host=roadie2.herokuapp.com
request_id=ca551858-5372-40c9-abf1-670176b159dc fwd="99.92.51.34"
dyno= connect= service= status=503 bytes= protocol=https
2017-09-08T02:12:25.340624+00:00 heroku[router]: at=error code=H10
desc="Appcrashed" method=GET path="/favicon.ico"
host=roadie2.herokuapp.com request_id=c37b876d-5a59-40d0-9d59-
9be013c58d94 fwd="99.92.51.34" dyno= connect= service= status=503
bytes= protocol=https
config.json
{
"development": {
"username": "root",
"password":"",
"database": "roadie2",
"host": "127.0.0.1",
"dialect": "mysql"
},
"test": {
"username": "root",
"password": null,
"database": "database_test",
"host": "127.0.0.1",
"dialect": "mysql"
},
"production": {
"use_env_variable": "JAWSDB_URL",
"dialect": "mysql"
}
}
server.js
var express = require("express");
var bodyParser = require("body-parser");
// Sets up the Express App
// =============================================================
var app = express();
// var PORT = process.env.PORT || 3000;
var port = process.env.PORT
// Requiring our models for syncing
var db = require("./models");
// Sets up the Express app to handle data parsing
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.text());
app.use(bodyParser.json({ type: "application/vnd.api+json" }));
// Static directory
app.use(express.static("./public"));
// Routes =============================================================
require("./routes/html-routes.js")(app);
require("./routes/api-routes.js")(app);
// Syncing our sequelize models and then starting our express app
db.sequelize.sync().then(function() {
app.listen(port, function() {
console.log("App listening on PORT " + port);
});
});
models/index.js
'use strict';
var fs = require('fs');
var path = require('path');
var Sequelize = require('sequelize');
var basename = path.basename(module.filename);
var env = process.env.NODE_ENV || 'development';
var config = require(__dirname + '/../config/config.json')[env];
var db = {};
if (config.use_env_variable) {
var sequelize = new
Sequelize(process.env[config.use_env_variable]);
} else {
var sequelize = new Sequelize(config.database, config.username,
config.password, config);
}
fs
.readdirSync(__dirname)
.filter(function(file) {
return (file.indexOf('.') !== 0) && (file !== basename) &&
(file.slice(-3) === '.js');
})
.forEach(function(file) {
var model = sequelize['import'](path.join(__dirname, file));
db[model.name] = model;
});
Object.keys(db).forEach(function(modelName) {
if (db[modelName].associate) {
db[modelName].associate(db);
}
});
db.sequelize = sequelize;
db.Sequelize = Sequelize;
module.exports = db;

Answer 1

https://devcenter.heroku.com/articles/error-codes#h10-app-crashed
Your logs clearly tell you why it's crash:
2017-09-08T02:11:37.293030+00:00 app[web.1]: Unhandled rejection .
SequelizeConnectionRefusedError: connect ECONNREFUSED 127.0.0.1:3306
You are unable to connect to your SQL server.
From the looks of it, you seemed to be trying to connect to 127.0.0.1:3306 which will not work. 127.0.0.1 or localhost is your local IP.
You need to either setup/connect to Heroku's Postgres addon or use an external SQL service such as Amazon RDS.