“Property Not Allowed” in angular.json error in Visual Studio CODE for Angular CLI version 9.1.1

Question

I created a new project using Angular CLI 9.1.1 and VSCode is giving me the following warning in angular.json file:

Property AM is not allowed
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Answer 1

There are 2 solutions which works for me 100% to overcome from the problem of "Property not allowed" in angular.json file.

1. Use the command in VS code cmd Ctrl+C choose option Y or

2. Restart the VS code after editing in angular.json file Hope it will helpful.

Answer 2

The error is resolved by creating another project but this time using the project name in lowercase letters.

Answer 3

The packages installed for Angular 10 project have a change in project name structure.

The file named "schema.json" which come along the packages installed by Angular has a property name "projects" which has the schema structure defined for the project name.

It looks like this:

"projects": {
  "type": "object",
  "patternProperties": {
      "^(?:@[a-z0-9-~][a-z0-9-._~]*\/)?[a-z0-9-~][a-z0-9-._~]*$": {
      "$ref": "#/definitions/project"
    }
  }

It is configured for lower case project names. You simply have to change the regex so that your uppercase project names can be considered.

Change the code as below:

"projects": {
  "type": "object",
  "patternProperties": {
    "^(?:@[a-zA-Z0-9-~][a-zA-Z0-9-._~]*\/)?[a-zA-Z0-9-~][a-zA-Z0-9-._~]*$": {
      "$ref": "#/definitions/project"
    }
  }

The schema.json is located at below path:

./node_modules/@angular/cli/lib/config/schema.json

After the change in schema.json file, restart your Visual Code Editor.

Answer 4

The schema is case sensitive. If you wish to fix:

Goto: ./node_modules/@angular/cli/lib/config/schema.json

At around line 27 you should find:

 "projects": {
      "type": "object",
      "patternProperties": {
        "^(?:@[a-z0-9-~][a-z0-9-._~]*\/)?[a-z0-9-~][a-z0-9-._~]*$": {
          "$ref": "#/definitions/project"
        }
      },

Change the regex pattern to allow Uppercase project names:

"^(?:@[a-zA-Z0-9-~][a-zA-Z0-9-._~]*\/)?[a-zA-Z0-9-~][a-zA-Z0-9-._~]*$"

Answer 5

Change the project name in all the .json files

Answer 6

The error was gone when change project name and all other occurrences for it in "angular.json" to lowercase letters. no need to create another project or any other stuff.