500 Server Error

[Rishi Patni]

Problem I have encountered:  

I'm deploying my node.js web app at App Engine standard environment

Issue - My code is working on port8080 but after deployment I got 500 Server Error

***Displayed error message on browser***

Error: Server Error
The server encountered an error and could not complete your request.
Please try again in 30 seconds.

***************************************

What I was expected to happen:

As code is working fine at port 8080 so I was expecting to see my app code running after app deployment same as it is running on port 8080


NOTE I have not received any !!!Critical !!!Alert or !!!Emergency in LOGS

***Error in Browser Console***
Failed to load resource: the server responded with a status of 500 (Internal Server Error)
******************************

*----- Other information ----*


NOTE: I'm using node v12.20.0


My package.json

{
  "name": "ecomm12",
  "version": "1.0.0",
  "description": "ecommerce training and services",
  "main": "app.js",
  "engines": {
    "node": "12.x.x"
  },
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "nodemon app.js",
    "start-server": "node app.js"
  },
  "author": "R",
  "license": "ISC",
  "devDependencies": {
    "nodemon": "^2.0.7"
  },
  "dependencies": {
    "body-parser": "^1.19.0",
    "ejs": "^3.1.6",
    "express": "^4.17.1",
    "mongodb": "^3.6.9"
  }
}


is it ok to use 12.x.x package.json?
as im using nodemon is it ok to use "start": "nodemon app.js",?

Noting is there in Logs Explorer (!!!Critical !!!Alert or !!!Emergency) then how to solve this issue?

[John Iacovacci]

App engine is very unforgiving and 500 is a generic error unfortunately Google does not have very good descriptive error reporting. I normally change code to a successful version (keep removing until something works) or use stackoverflow to debug.

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[Sergi (Google Cloud Platform Support)]

Hello,

To find the root cause of this issue, if we can find the logs for this error will be helpful. 

In this documentation [1] there is a sample query that you could try to check for logs error with status 500 [2]. Alternatively you could also try running ‘gcloud app logs read’ [3] to see if you get any logs.

[1] https://cloud.google.com/logging/docs/view/query-library#gae-filters

[2]

resource.type="gae_app" AND

log_id("appengine.googleapis.com/request_log") AND

httpRequest.status>=500

[3] https://cloud.google.com/sdk/gcloud/reference/app/logs/read