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Chrome Policy Error

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Posted on by KM-21021458-0

Getting a Chrome Policy error "Expected string value" when using the "DefaultPrinterSelection" entry in policies.json

My policies file entry is...

{

"namePattern": {
   "description": "Printernamehere",
   "type": "string"
  }
 },

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Ravi-Prajapati 416 Super User 2025 Season 2 on at

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The error "Expected string value" in your policies.json file suggests that there is a formatting issue with the "DefaultPrinterSelection" entry. The structure of the policy might be incorrect.

Correct Format for DefaultPrinterSelection

The Google Chrome Enterprise policies documentation specifies that DefaultPrinterSelection should be an array of objects, with each object containing a "namePattern" key and a string value. Here's the correct structure:

{ "DefaultPrinterSelection": [ { "namePattern": "Printernamehere" } ] }

Issues with Your JSON

Your original JSON appears to be incorrect because:

The key "DefaultPrinterSelection" is missing.

"namePattern" should be inside an array as part of DefaultPrinterSelection.

The "type": "string" and "description" keys are unnecessary in policies.json.

Steps to Fix

Replace your current policies.json entry with the correctly formatted JSON above.

Ensure the file is valid JSON (you can use an online JSON validator like jsonlint.com).

Restart Chrome or enforce the policy using:

On Windows: Run gpupdate /force (if managed via Group Policy).

On Mac/Linux: Restart Chrome.

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KM-21021458-0 2 on at

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Hi Ravi

Many thanks for response

I was following the guide here which doesn't mention any array requirement

Chrome Enterprise policy list and management | Documentation

However I have now found syntax which appears to fulfil my requirements and sets the default printer to one of my choosing by setting the policies.json entry as follows:

{
"DefaultPrinterSelection": "{ \"namePattern\": \"Printernamehere\" }"
}

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