# JSON Validator

> json-validator

- Skill: `ondrej-merkun/json-validator` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add ondrej-merkun/json-validator`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ondrej-merkun/json-validator/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: ondrej-merkun (https://skillmd.com/u/ondrej-merkun)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/ondrej-merkun/json-validator

---

# json-validator

Validates JSON files against JSON Schema drafts 7 and 2020-12, and pretty-prints
or minifies JSON output.

<json-validator>
Commands:
- `validate <schema.json> <data.json>` — validate data against a schema, print errors
- `pretty <file>` — pretty-print JSON with 2-space indent
- `minify <file>` — minify JSON (remove whitespace)
- `check <file>` — parse and report syntax errors without schema validation

Dependencies: `jsonschema>=4.0` for schema validation. Pretty/minify use stdlib only.

Example:
```
validate schemas/user.json data/users.json
```
</json-validator>