JSON Plugin

Rules for linting .json files containing arbitrary data in the JavaScript Object Notation (JSON) format.
This plugin comes packaged 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 Rule	Preset
keyDuplicatesReports unnecessary duplicate keys that override previous values.	logical
keyNormalizationReports object keys that are not normalized using Unicode normalization forms.	logical
valueSafetyReports JSON values that are unsafe for data interchange.	logical

Selectors

Flint’s JSON plugin provides the following files selector:

• all: **/*.json