json/no-empty-keys

JSON allows "" as a key, but it's almost always a mistake: a name that was never filled in, or a template that printed nothing. Many tools that read the file into an object or a database column can't use such a key.

A key that contains only whitespace also counts as empty.

Configure

Off by default. It needs an ESLint config that says which files are in the language:

import json from "@eslint/json";

export default [
  {
    files: ["**/*.json"],
    plugins: { json },
    language: "json/json",
    rules: { "json/no-empty-keys": "error" },
  },
];

It also works with json/jsonc and json/json5.

Examples

Reported:

{
  "": "app"
}

{
  "  ": "app"
}

Not reported:

{
  "name": "app",
  "description": ""
}