In VS Code, disable error "Comments are not permitted in JSON"

Question

Follow these steps:

1. Click on the letters JSON in the bottom right corner. (A drop-down will appear to "Select the Language Mode.")
2. Select "Configure File Association for '.json'..."

3. Type jsonc and press Enter.

If you only want to disable the error message for a single file, skip step #2.

Add this to your User Settings:

"files.associations": {
    "*.json": "jsonc"
},

If you don't already have a user settings file, you can create one. Hit Ctrl+, or ⌘+, (that's a comma) to open your settings, then hit the Open Settings (JSON) button in the upper right. It looks like this:

Just rename file to test.jsonc

Reasons to use JSONC and not to allow comments in the regular JSON files are:

1. It will separate your file from real JSON files
2. It is not going to bite you in the back when you add comment to a file where validation has to be applied, but you forget to remove comments because there is no error message.
3. It is going to work out of the box on any setup without "tuning" someone else's VS Code.