NPM Run Configuration: cannot execute some scripts from `package.json`

[nimo23]

I have a NPM run configuration pointing to an existing package.json (which is not in the root-directory of the project but within a subfolder):

However, executing the run configuration does not work:

npm error code ENOENT
npm error syscall open
npm error path /Users/ev/ide/app/package.json
npm error errno -2
npm error enoent Could not read package.json: Error: ENOENT: no such file or directory, open '/Users/ev/ide/app/package.json'
npm error enoent This is related to npm not being able to find a file.
npm error enoent
npm error A complete log of this run can be found in: /Users/ev/.npm/_logs/2025-08-03T00_54_31_316Z-debug-0.log

The log says that package.json cannot be found in /Users/ev/ide/app/package.json, although it should look in /Users/ev/ide/app/src/main/webui/package.json as specified in the launch configuration. I also tried with absolute path (= /Users/ev/ide/app/src/main/webui/package.json) in the launch configuration - it shows the same error.

• On Mac OS
• Eclipse Version: 2025-03 (4.35.0)
• Wild Web Developer: 1.3.10.202502071606

[mickaelistria]

I'm having trouble to reproduce with a simple project.
I tried

• project (imported as project in the IDE, root element in the Project Navigator)
  • sub/
    • package.json (with content

{
  "scripts": {
     "test": "echo lol"
  }
}

I think try Run As > NPM... on context-menu of the package.json file)
And I get a console showing the exepcted

> test
> echo lol

lol

Can you please try finding such a minimal project that allows you to reproduce the issue and shared more detailed steps to reproduce from scratch?

[nimo23]

Ok, adding a run config with test or install works for me, too. And there is no subpath-issue but with executing scripts such as dev, build, lint or preview:

  "scripts": {
    "test": "echo lol",
    "dev": "vite",
    "build": "tsc -b && vite build",
    "lint": "eslint .",
    "preview": "vite preview"
  },

For example, adding run config build:

and executing, leads to:

Unknown command: "build"

Did you mean this?
  npm run build # run the "build" package script
To see a list of supported npm commands, run:
  npm help

How to solve this?

Reproducer:

webui.zip

[mickaelistria]

I still cannot reproduce the issue. From the given reproducer project, can you please share details to reproduce from a clean workspace (including how the project is imported, what UI entry-points do you use to run npm..._ ?

[nimo23]

including how the project is imported

1. I created the project from within the Eclipse workspace directory by

npm create vite@latest webui -- --template react-ts

2. Then I created a new Eclipse static web project called "webui" and the content of the created webui becomes visible.

3. Then I executed npm install

4. Then I created the launch configuration for dev (see picture above)

5. Then I wanted to execute the Npm command dev. Executing npm run dev from the terminal works without issues, but executing it from the Launch configuration (see picture above), does not work - it shows in the terminal:

Unknown command: "build"

Did you mean this?
  npm run build # run the "build" package script
To see a list of supported npm commands, run:
  npm help

what UI entry-points do you use to run npm

cd webui
npm install 
npm run dev //works from the terminal but not from the Launch configuration (see above)

I also tried using run build instead of build:

But it doesn't work either - the terminal output:

> webui@0.0.0 build
> tsc -b && vite build

env: node: No such file or directory

[mickaelistria]

It looks like node is not well detected on your machine; and npm may be misconfigured. It could again be different on your machine because it's a mac, and as you probably notice, mac tends to be undertested/undersupported by the community by lack of maintainers using it.

In Help > About Eclipse IDE > Installation Details > Plugins tab; please search for "node.js" and report what you see there.

[nimo23]

In Help > About Eclipse IDE > Installation Details > Plugins tab; please search for "node.js" and report what you see there.

It looks like node is not well detected on your machine; and npm may be misconfigured.

node/npm are globally available from the terminal:

which node
/opt/homebrew/bin/node

which npm
/opt/homebrew/bin/npm

Running node/npm from the Eclipse terminal also works, BUT ONLY if I set Arguments: --login (btw: on a new Eclipse installation, it does not set Arguments: --login , so perhaps it would be useful to set this by default):

I assume that Eclipse WWD or Eclipse NPM Launch Configuration wants to execute its command without terminal argument --login. Because without --login, node/npm is indeed not found by eclipse terminal and launch configuration:

// Executed from within the Eclipse Terminal without --login argument

which node
node not found

which npm
npm not found

To sum up:

Eclipse WWD or Eclipse NPM Launch Configuration should always run their tasks with the terminal argument --login. Unfortunately, the Eclipse terminal settings are delegated to Eclipse NPM Launch Configuration. Therefore, it would be good if Eclipse NPM Launch Configuration could use the custom Eclipse terminal settings or always run its tasks with --login. Alternatively, an input field could be added where the user can enter terminal arguments when running a task: