JSON formatter and validator in the browser

A JSON formatter turns a one-line payload into readable indentation so you can debug APIs, configs, and webhooks. Pair it with a JSON validator when you need a clear pass/fail on syntax.

Steps

1. Open the JSON formatter.
2. Paste raw JSON (or a minified response).
3. Format / beautify to inspect structure.
4. Use the JSON validator when you only need a validity check.
5. For auth tokens, decode payloads carefully with JWT decoder—never paste production secrets into untrusted sites.

Formatting stays local—safer for staging dumps that still contain PII.

When formatting helps

• Spot missing commas and trailing commas before deploy
• Compare nested objects side by side after pretty-print
• Share readable snippets in code review (redact secrets first)

Tips

• Validate after copy-paste from Slack—smart quotes break JSON
• Minify only when a system requires a single-line body
• Prefer schema-aware checks in CI for production contracts; this tool is for quick local syntax

Limits

Mewix formats and validates JSON syntax. It does not enforce your OpenAPI/JSON Schema, call remote APIs, or store history in the cloud.

CTA: Format JSON in your browser.