AWS Lambda: module initialization error: TypeError

Question

I am trying to deploy AWS lambda function and I have written code in express:

Code:

 var express = require('express');
    var bodyParser = require('body-parser');
    var lampress = require('lampress');
    var request = require('request');
    var app = express();

    app.set('port', (process.env.PORT || 5000));

    // Process application/x-www-form-urlencoded
    app.use(bodyParser.urlencoded({extended: false}));

    // Process application/json
    app.use(bodyParser.json());

    // Index route
    app.get('/', function (req, res) {
        res.send('Hello! I am a Chatbot designed to help you learn  Type "begin" to start a chat! You can type "begin" at any time to return to the first menu');
    });

    // for Facebook verification
    app.get('/webhook/', function (req, res) {
        if (req.query['hub.verify_token'] === 'xyz') {
            res.send(req.query['hub.challenge']);
        }
        res.send('Error, wrong token');
    });

    // Spin up the server
     app.listen(app.get('port'), function() {
        console.log('running on port', app.get('port'));
    });

    //figure out if your greeting text is working
    //need persistent menu?
    app.post('/webhook/', function (req, res) {
        getStarted();
        greetingText();
        messaging_events = req.body.entry[0].messaging;
        for (i = 0; i < messaging_events.length; i++) {

            event = req.body.entry[0].messaging[i];
            sender = event.sender.id;
            if (event.message && event.message.text) {
            //code
            }
            if (event.postback) {
            //code
            }
            console.log('********2');
        }
        res.sendStatus(200)
    });

    exports.handler = lampress(app, function() {
        console.log("Server has started");
    });

Error:

 module initialization error: TypeError
        at lampress (/var/task/node_modules/lampress/index.js:82:10)
        at Object.<anonymous> (/var/task/index.js:829:23)
        at Module._compile (module.js:409:26)
        at Object.Module._extensions..js (module.js:416:10)
        at Module.load (module.js:343:32)
        at Function.Module._load (module.js:300:12)
        at Module.require (module.js:353:17)
        at require (internal/module.js:12:17)*

I have proper node_modules in place. Why wont this work.

compressed zip structure --> index.js --> node_modules folder.

package.json: "lampress": "^1.1.1"

catamphetamine · Accepted Answer · 2019-04-24 02:36:42Z

2

FYI For me, it was source-map-support that discarded the actual error message and stack trace. Once I commented out the source-map-support import line then the error started showing the actual error message and stack trace. https://github.com/evanw/node-source-map-support/issues/240

answered Apr 24, 2019 at 2:36

catamphetamine

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Comments

schu34 · Accepted Answer · 2017-02-02 02:07:12Z

1

I think your problem is at exports.handler = lampress(... as per the lampress docs lampress() takes 2 arguments, the first a port number and the second a server. You've passed in a server for the first argument and a function for the second, so lampress throws a TypeError

The correct code would be:

exports.handler = lampress(<your port number>, app);

edited Feb 2, 2017 at 2:07

answered Feb 2, 2017 at 2:05

schu34

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6 Comments

schu34 Over a year ago

Thats for version 2.0.0. Installing lampress via npm install lampress installs 1.1.1 so the docs at npmjs.com/package/lampress should be correct.

SylonZero Over a year ago

He didn't mention how he installed it. And more significantly, the stack trace of his error seems to be originating from a require statement.

user2936008 Over a year ago

I have installed version npm -v lampress 4.1.2 . I am not sure if I am in the right version packge.json has : "lampress": "^1.1.1" should

user2936008 Over a year ago

@suchu34 What would be the port name while deploying in AWS lambda: Heroku and openshift has : envirnment object which is process.env

user2936008 Over a year ago

I have created new function with the mentioned code format and I get the error: stackoverflow.com/questions/42008247/…

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SylonZero · Accepted Answer · 2017-02-02 02:05:52Z

1

Depending on how you sourced the module, can you try:

require('./lampress');

Also, in your route handler, minor correction to avoid sending a response twice:

app.get('/webhook/', function (req, res) {
    if (req.query['hub.verify_token'] === 'xyz') {
        return res.send(req.query['hub.challenge']);
    }
    res.send('Error, wrong token');
});

answered Feb 2, 2017 at 2:05

SylonZero

1,2078 silver badges9 bronze badges

3 Comments

user2936008 Over a year ago

Thanks for the correction Sylon.changing require('./lampress'); I am facing module initialization error. Since It cannot find lampress node module.

user2936008 Over a year ago

Exact error: Error: Cannot find module './lampress' at Function.Module._resolveFilename (module.js:469:15) at Function.Module._load (module.js:417:25)

user2936008 Over a year ago

I have created new function and I get the error: stackoverflow.com/questions/42008247/…

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