JSON Formatter
Paste JSON and format it into readable, indented output instantly.
Input is processed in your browser and is not uploaded.
Output
Results appear here.Add input to see a result.
Use this JSON formatter when raw API responses, config files, or logs are hard to read. It validates the input first, then produces consistently indented JSON that is easier to inspect and share. Lightweight, mobile-friendly, and built for quick repeat use.
Readable JSON for APIs, logs, and config reviews
Messy JSON usually appears at the worst moment: inside a webhook payload, a copied network response, or a production log line. This formatter keeps the task focused on inspection. It validates first, then turns compact objects into a stable shape so nested fields, arrays, and escaped values can be reviewed without sending the payload away from the browser.
API response triage
Paste a raw response from DevTools or a terminal command to find the field that changed, confirm nested arrays, and check whether booleans, nulls, and numbers arrived as the types you expected.
Config cleanup
Format package metadata, service account snippets, feature flag exports, and other JSON configuration before committing them or sharing a small excerpt in a ticket.
Log inspection
Pretty-print one-line structured logs so request IDs, user actions, timestamps, and error details can be scanned without manually adding line breaks.
A careful formatting workflow
- 1Paste the smallest JSON sample that reproduces the question you are investigating.
- 2Format it once, then scan the first syntax error before changing the input.
- 3Compare key names and value types before copying the formatted output into docs, test fixtures, or a bug report.
- 4Remove secrets, tokens, and personal data before sharing the result outside your own machine.
Before and after
{"event":"checkout","ok":true,"items":[{"sku":"A-10","qty":2}],"meta":{"source":"api"}}{
"event": "checkout",
"ok": true,
"items": [
{
"sku": "A-10",
"qty": 2
}
],
"meta": {
"source": "api"
}
}The formatted version makes the array item and metadata block visible at a glance.
Common mistakes to check
- Trailing commas are valid in JavaScript objects but invalid in strict JSON.
- Single-quoted keys and comments need to be removed before parsing as JSON.
- Very large payloads are easier to review when you isolate the relevant branch first.
FAQ
What is JSON formatting?+
JSON formatting adds indentation and line breaks to compact JSON so humans can read it more easily.
Is my JSON uploaded?+
No. The formatter runs in your browser and does not send your input to a server.
Can this fix invalid JSON?+
It shows syntax errors, but it does not guess or rewrite broken JSON automatically.