Deploy to Heroku fails with npm ERR! missing script: start about json-graphql-server HOT 1 CLOSED

    ....
       "scripts": {
        ...
        "start": "bin/json-graphql-server.js db.js"
    },
    ...

#!/usr/bin/env node
require('reify');
var path = require('path');
var express = require('express');
var JsonGraphqlServer = require('../lib/json-graphql-server.node.min').default;

var dataFilePath = process.argv.length > 2 ? process.argv[2] : './data.json';
var data = require(path.join(process.cwd(), dataFilePath));
var app = express();

app.set('port', (process.env.PORT || 3000));
app.use('/', JsonGraphqlServer(data));
app.listen(app.get('port'));