About

Flint’s JSON plugin supports linting .json source code. It comes provided with the flint npm package.

Presets

Flint’s JSON plugin provides the following preset:

Preset	Recommended	Description
logical	✅ Always	Common rules for finding bugs and good practices in JSON files.

Flint recommends using the logical preset:

flint.config.ts

import { defineConfig, json } from "flint";

export default defineConfig({
  use: [
    {
      files: json.files.all,
      rules: json.presets.logical,
    },
  ],
});

Note

Coming soon: more expansive documentation on choosing and combining plugins & presets with Flint.

logical

Rules that find bugs and enforce good JSON practices for most-to-all JSON files.

flint.config.ts

import { defineConfig, json } from "flint";

export default defineConfig({
  use: [
    {
      files: json.files.all,
      rules: json.presets.logical,
    },
  ],
});

Rules

Flint Name	Preset	Biome Rule(s)	Deno Lint Rule(s)	ESLint Rule(s)	Oxlint Rule(s)
keyDuplicates	Logical		no-dupe-keys	jsonc/no-dupe-keys
keyNormalization	Logical			json/no-unnormalized-keys
valueSafety	Logical			json/no-unsafe-values

Selectors

Flint’s JSON plugin provides the following files selector:

• all: **/*.json