IONIC : A utility CLI has unexpectedly closed

Question

I got this error when i run ionic serve The Ionic CLI will exit. Please check any output above for error details.

my ionic info

$ionic info
Ionic:

   i         


        

Answer 1

I had a similar issue. I tried several different solutions, and for some reason different ones worked on different machines. Because I'm an illogical masochist, I attempted to fix this issue in the same project on 3 different laptops instead of sending the new fixed version to the other laptops.

The best answer I came up with is to:

• Delete node_modules
• copy node_modules from a different project (I used an earlier version of my app)
• run npm i to install any missing modules

I think this approach should work for almost all instances.

Answer 2

Try replacing the package.json scripts parts. Worked for me.

  "scripts": {
    "build": "ionic build",
    "serve": "ionic build",
    "start": "npm run serve"
  },

Answer 3

I had a similar issue:

Assertion `args[1]->IsString()' failed.

A utility CLI has unexpectedly closed

I fixed that by installing natives lib through npm:

npm i natives

Answer 4

Simpy run

npm install @ionic/app-scripts@latest --save-dev

and then

ionic serve

This error is because of some audit during installing a plugin or adding a plug in