parse-server-mailgun configuration issue - node.js

Question

I am working on an iOS app using parse-server (/Heroku) as a back-end.
I would like to implement an email-confirmation system when a user creates an account, and also allow email recovery of lost passwords.
For that I want to use mailGun. I have installed the adapter by running:
npm install --save parse-server-mailgun
I have also added this to the ParseServer configuration block.
verifyUserEmails: true,
emailAdapter: {
//module: 'parse-server-simple-mailgun-adapter',
module: '#parse/simple-mailgun-adapter',
//module: '#parse-server-mailgun',
options: {
// The address that your emails come from
fromAddress: 'me#abc.com',
// Your domain from mailgun.com
domain: 'something.com',
// Your API key from mailgun.com
apiKey: 'mykey-mykey-mykey-mykey-mykey-mykey',
}
}
But it is not working. I don't know if I forgot some important step, other than the two above. Or if my configuration is wrong. I must admit I am not confident about the line above reading:
module: '#parse/simple-mailgun-adapter',
Here is what I get when running the push:
git add . && git commit -m "update myapp" && git push heroku master
2018-03-08T09:03:3......0 app[api]: - Build started by user me
.....
2018-03-08T09:03:3......0 app[api]: Build succeeded
2018-03-08T09:03:5......0 heroku[web.1]: State changed from crashed to starting
2018-03-08T09:04:0......0 heroku[web.1]: Starting process with command `npm start`
.....
2018-03-08T09:04:0......0 app[web.1]: > node index.js
2018-03-08T09:04:0......0 app[web.1]:undefined
2018-03-08T09:04:1......0 app[web.1]:
2018-03-08T09:04:1......0 app[web.1]: /app/node_modules/parse-server/lib/Config.js:174
2018-03-08T09:04:1......0 app[web.1]: throw 'An app name is required for e-mail verification and password resets.';
2018-03-08T09:04:1......0 app[web.1]: ^
2018-03-08T09:04:1......0 app[web.1]: An app name is required for e-mail verification and password resets.
2018-03-08T09:04:1......0 app[web.1]: npm ERR! code ELIFECYCLE
2018-03-08T09:04:1......0 app[web.1]: npm ERR! errno 1
2018-03-08T09:04:1......0 app[web.1]: npm ERR! parse-server-example#1.4.0 start: `node index.js`
2018-03-08T09:04:1......0 app[web.1]: npm ERR! Exit status 1
2018-03-08T09:04:1......0 app[web.1]: npm ERR!
2018-03-08T09:04:1......0 app[web.1]: npm ERR! Failed at the parse-server-example#1.4.0 start script.
2018-03-08T09:04:1......0 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely ...
2018-03-08T09:04:1......0 app[web.1]:
2018-03-08T09:04:1......0 app[web.1]: npm ERR! A complete log of this run can be found in:
2018-03-08T09:04:1......0 app[web.1]: npm ERR! ....-debug.log
2018-03-08T09:04:1......0 heroku[web.1]: Process exited with status 1
2018-03-08T09:04:1......0 heroku[web.1]: State changed from starting to crashed
2018-03-08T09:04:1......0 heroku[web.1]: State changed from crashed to starting
2018-03-08T09:04:1......0 heroku[web.1]: Starting process with command `npm start`
2018-03-08T09:04:2......0 app[web.1]:
2018-03-08T09:04:2......0 app[web.1]: > parse-server-example#1.4.0 start /app
2018-03-08T09:04:2......0 app[web.1]: > node index.js
2018-03-08T09:04:2......0 app[web.1]:undefined
2018-03-08T09:04:2......0 app[web.1]:
2018-03-08T09:04:2......0 app[web.1]: /app/node_modules/parse-server/lib/Config.js:174
2018-03-08T09:04:2......0 app[web.1]: throw 'An app name is required for e-mail verification and password resets.';
2018-03-08T09:04:22.996195+00:00 app[web.1]: ^
2018-03-08T09:04:22.996197+00:00 app[web.1]: An app name is required for e-mail verification and password resets.
2018-03-08T09:04:23.011936+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2018-03-08T09:04:23.012286+00:00 app[web.1]: npm ERR! errno 1
2018-03-08T09:04:23.013532+00:00 app[web.1]: npm ERR! parse-server-example#1.4.0 start: `node index.js`
We can read 'An app name is required for e-mail verification and password resets.' But I am not sure where to fix that.
Beside I need to clarify that the app is working as expected, before I get into trying to install this mailGun adapter.

Answer 1

The error indicates appName property is not configured. It throws because the default email template references appName. There are two ways to configure appName:
If you start your parse-server with a config.json file, add it to the config.json like this:
config.json: { "allowClientClassCreation": false,
...
"appName": "my_app_name",
...
}
Alternatively, set the appName with env variable:
PARSE_SERVER_APP_NAME="my_app_name"
references:
Your best guide is the code:
https://github.com/parse-community/parse-server/blob/637326d3afcf82a4118f5ad5b316e6ae52fb5910/src/Options/Definitions.js
Documentation:
https://parseplatform.org/parse-server/api/4.5.0/#email-verification-and-password-reset
https://parseplatform.org/parse-server/api/master/ParseServerOptions.html