Unable to run 'npm run start' cmd while creating custom app

[Tanveermd]

Hi,

I am unable to run 'npm run start' cmd while creating custom app, here is the error that I am getting, please could you help me in resolving this error

C:\Users\xxxxx\tansre-3>npm run start
npm ERR! Missing script: "start"
npm ERR!
npm ERR! Did you mean one of these?
npm ERR! npm star # Mark your favorite packages
npm ERR! npm stars # View packages marked as favorites
npm ERR!
npm ERR! To see a list of scripts, run:
npm ERR! npm run

npm ERR! A complete log of this run can be found in: C:\Users\xxxxx\AppData\Local\npm-cache\_logs\2024-11-05T21_38_41_992Z-debug-0.log

[Mulks · Accepted solution]

Check to make sure you have the correct package.json file. There will be a scripts block with all the npm commands available to the app.

Example:

"scripts": {

    "build": "dt-app build --prod",

    "start": "dt-app dev",

    "generate:function": "dt-app generate function",

    "generate:action": "dt-app generate action",

    "uninstall": "dt-app uninstall",

    "deploy": "dt-app deploy",

    "update": "dt-app update",

    "info": "dt-app info",

    "help": "dt-app help",

    "lint": "eslint ."

  }

[Taylor-Sanchez · Accepted solution]

You may simply be missing the `start` script that should be located in in the `package.json` file. I would verify that this script actually exists before running. 

[Tanveermd]

Many thanks for your response Mulks and Taylor, I am able to start the development server, but now ending-up with the following error

C:\Users\xxxx\tansre-3>npm run start

> start
> dt-app dev

Warning ──────────────────────────────────────────────────────────────────────────────────

Failed to retrieve user details. App functions will use placeholder data.

──────────────────────────────────────────────────────────────────────────────────────────

DT-APP: Started local development server
> <no file> - Error: Cannot find tsconfig file "tsconfig.json"

> <no file> - Error: Could not resolve "C:\\Users\\xxxx\\tansre-3\\src\\main.tsx"

× Authenticating...
Error: SSO-URL for 'https://{environmentid}.apps.dynatrace.com' could not be processed.
self-signed certificate in certificate chain
If you need further assistance visit the connectivity troubleshooting guide here: https://dt-url.net/c4jp0s12

Looks like I am still missing something. Please advise

[zaid-bashir]

Hi @Tanveermd,
It is a better approach to install the Dynatrace Apps extension on VSCode. Just search in VScode Extensions for "Dynatrace Apps".

Once you create the project, it will show you "[Dynatrace] Not Authenticated".

Not Authenticated

Just Click on it and it will show you dialog like the below to authenticate your self with the dynatrace account.

If you are still facing problem, try to look into your package.json file for "scripts" parameter. Below you can find the "scripts" field.

  "scripts": {

    "build": "dt-app build --prod",

    "start": "dt-app dev",

    "generate:function": "dt-app generate function",

    "generate:action": "dt-app generate action",

    "uninstall": "dt-app uninstall",

    "deploy": "dt-app deploy",

    "update": "dt-app update",

    "info": "dt-app info",

    "help": "dt-app help",

    "lint": "eslint ."

  }

Thanks

[MarwanC]

Just a very simple question, how did you instal this tool in the first place: I am getting this error: C:\Users\1\NodeJS\node-v22.16.0-win-x64>npm install -g @dynatrace/dt-app
npm error code E404
npm error 404 Not Found - GET https://registry.npmjs.org/@dynatrace%2fdt-app - Not found
npm error 404
npm error 404 '@dynatrace/dt-app@*' is not in this registry.
npm error 404
npm error 404 Note that you can also install from a
npm error 404 tarball, folder, http url, or git url.
npm error A complete log of this run can be found in: C:\Users\1\AppData\Local\npm-cache\_logs\2025-06-16T14_12_54_833Z-debug-0.log - Any feedback is much appreciated?

[zaid-bashir]

Hi @Tanveermd 

First of all, try to create project in a disk different from "C" disk. If "C" is your only available disk, then try to create one folder like "src" under "C" drive and then create a project under "C/src/" because sometimes permissions also create problem.

After you created your project using "npx dt-app@latest create" and you followed the instructions given there. Try to point out to the same directory i mean be in the root directory of the project and then run the command like:

"npm run start".

If you face some issues related to authentication while running the app, here i have given you answer for that.
https://community.dynatrace.com/t5/Developer-Q-A-Forum/Unable-to-run-npm-run-start-cmd-while-creatin...