esLint returning error for ":"

[raulranga]

Installed @eslint/json and added the configuration file for eslint.

In my test file I have:
{
"Test": "test"
}

For some reason I get an eslint error for ":" when running npx eslint
Parsing error: Unexpected token :eslint

Could someone help me out? =D

[Git-Yuya]

Please add the language property and check if it works correctly. Here is a reference link.

[raulranga]

Thank you, it worked!
I was also trying to create a custom rule for comma, but I created a simple context.report to see that everything works and it returns the message and the error is not displayed when running eslint. Did I do something wrong?

[nzakas]

You need to load your rule into your config file. See:
https://eslint.org/docs/latest/extend/custom-rule-tutorial#step-8-use-the-plugin-locally

[Git-Yuya]

Instead of creating your own custom rule for this, I would recommend using eslint-plugin-jsonc. It's a dedicated package.

1. Install packages:

npm install --save-dev eslint-plugin-jsonc jsonc-eslint-parser

2. Set trailing comma rules.
   https://ota-meshi.github.io/eslint-plugin-jsonc/rules/comma-dangle.html

[raulranga]

Thank you!

[Git-Yuya]

Thank you!
If my answer was helpful, please consider marking it as the accepted answer.