FreeAPI

JSON Formatter & Validator

Prettify & Minify0ms Client Sandbox

Ultra-fast JSON formatter and validator for developers. Identifies syntax errors with exact line/column indicators, applies 2/4 space indentation or minification.

All Tools

Interactive Tool Console

Local Browser • Zero Latency & 100% Private

Live API IntegrationPublic Edge REST API

Call this tool in your codebase or backend services directly via REST API.

curl -X POST "https://findfreeapi.com/api/v1/tools/json-format" \
  -H "Content-Type: application/json" \
  -d '{"json":"{\"name\":\"FreeAPI\",\"type\":\"gateway\"}","indent":2,"sortKeys":true}'
POST/api/v1/tools/json-format
No API Key Required (Public Edge)
Verified Developer Cloud PerksZero card walls & instant credits
DO
DigitalOcean
$200 Free Cloud Credit
SA
ScraperAPI
5,000 Free API Credits
BD
Bright Data
Free Trial & Web Unlocker

Key Standards & Highlights

Instant JSON syntax error diagnostics with line/col reporting
2 spaces, 4 spaces and Tab indentation
One-click Minification with compression stats
Deep alphabetical key sorting for nested structures

Frequently Asked Questions

Is this JSON formatter secure? Is my data sent to a server?

Completely secure. Formatting, syntax validation, and minification run entirely in your local browser; no data is ever transmitted to a server.

How does the tool detect JSON syntax errors?

When an invalid JSON string is pasted, the validator highlights the exact line and column number of the syntax fault with a clear error explanation.

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