JSON Formatter
Beautify, validate, and compress JSON payloads with pixel-perfect output. Built for API explorers, platform teams, and technical writers who need clarity fast.
Frictionless
Free, no signup, works anywhere
Developer tuned
Large files, shortcuts, theme aware
Privacy first
Everything runs locally in your browser
Input
Paste JSON or drop a file to get started.
Formatter options
Configure validation, upload data, and transform results.
Formatting controls
Input & validation
Pick the standard that matches your integration target. Skip validation for quick formatting.
Conversions
Output
Review, copy, or download the result.
Built for modern debugging
Packed JSON makes audits painful. The SCOI.IO JSON Formatter opens those payloads up with smart indentation, syntax cues, and guardrails that mirror real production rules. Whether you’re verifying a webhook, rewriting documentation, or storytelling with data, you get a polished view in seconds.
Under the hood we track updates from RFC 8259, ECMA-404, and community conventions so the validator behaves like the services you ship. The result: fewer regressions, fewer late night bug hunts, and faster sign-off from security and QA teams.
What sets this formatter apart
We built every feature to clear bottlenecks in API and data workflows. Pair it with your existing version control, design systems, and test suites for a portable formatting lab.
Precision formatting
Beautify, align, and diff with ease
- Indent presets (2, 3, 4 spaces, or tabs) tuned for code reviews
- Preserves intentional ordering for specification snippets
- Keyboard shortcuts for format, minify, clear, and copy
Diagnostics that guide you
Catch issues before they ship
- Line-aware error messages mapped to plain-language hints
- Smart fixes clean stray commas, quotes, and numeric keys
- Session history retains your last payload for quick rollbacks
Collaboration ready
Share, extend, and automate
- Download prettified files for design and QA handoffs
- Companion converters cover CSV, YAML, XML, and more
- Bookmarkable URL parameters preload indentation and spec choices
Learn about JSON
JSON (JavaScript Object Notation) is the backbone of modern data exchange—concise, language-neutral, and easy to traverse. Mastering it unlocks faster troubleshooting, bulletproof documentation, and cleaner integrations.
Standards & best practices
Hands-on tutorials
Try a sample payload
Explore nested arrays, timestamps, and mixed data types with this starter snippet. Switch between Format and Minify to watch the output adapt in real time.
{
"subscription": {
"plan": "Pro",
"features": [
"real-time sync",
"role-based access",
"audit logging"
],
"owner": {
"name": "Alex Rivera",
"email": "alex@example.com"
},
}
}Copy the result straight into configuration files, OpenAPI examples, or docs templates and keep everything consistent across your stack.
How to get clean JSON every time
Follow these steps to keep your payloads ready for code reviews and release notes:
- Paste, drop, or upload a JSON file into the Input editor.
- Pick an indentation preset or enable auto-detect for existing styles.
- Choose Format for human-friendly output or Minify for compact transport.
- Review validator hints, then copy, download, or share the refined payload.
- Bookmark the page with settings in the URL to replay your favorite configuration.
Pro tip: add this formatter to your PR checklist so API contracts stay consistent across backend, frontend, and documentation teams.
Frequently asked questions
Engineers and analysts often ask the questions below. Pop open any item, orreach out if you need a tailored workflow.
Release highlights
We ship enhancements regularly so the formatter grows with your workflow. Recent updates include:
September 2025
Added knowledge-base links, refreshed long-form layout, and tuned structured data for richer search snippets.
July 2025
Delivered automatic fixes for common syntax mistakes and introduced session rollback for QA reviews.
April 2025
Upgraded the validation engine to align with RFC 8259, expanded converter integrations, and rolled out keyboard shortcuts for power users.