json-lint

A fast Rust JSON linter and fixer, inspired by json-linter. It is distributed as a prebuilt binary on PyPI, the same way as ruff.

pip install fast-json-lint
json-lint my-file.json some-dir/

For every file (or every *.json file in a given directory) it:

• sorts object keys recursively in natural order (a2 before a10)
• rewrites the file with 2-space indentation and a trailing newline
• reports files that are not valid JSON and leaves them unchanged

It exits with status 1 if any file fails.

pre-commit

repos:
  - repo: https://github.com/Kanzey/json-lint
    rev: v0.1.2
    hooks:
      - id: json-lint
        # files: ^config/   # optionally limit which JSON files are touched

The hook runs on all *.json files. pre-commit builds it with cargo the first time and caches it, installing a Rust toolchain if one is missing. Because the hook rewrites files, the first run fails if anything changed: review the changes, git add them, and commit again.