JSON Editor: Format, Minify & Validate Locally — Tutorial

Upload a local .json file (max 2MB) or click New File to enter the full-screen editor. Format, minify, copy, and save locally — nothing is uploaded.

Features

• Two entry points: upload JSON, or create a blank document.
• Pseudo-full-screen editing.
• One-click format (2-space indent) and minify — does not auto-copy; use Copy.
• Syntax error location; content capped at 10,000 lines.
• Save prefers the system Save As dialog; after the first successful save the button becomes Auto-saving (green status style, disabled) and ~1s debounce writes back (restores Save if the file is deleted or permission is lost; falls back to download when unsupported).

Use Cases

• Debug nested API payloads.
• Beautify JSON logs.
• Export formatted or minified JSON for handoff.

How to Use

1. Upload a file or click New File.
2. Paste or edit JSON (max 10,000 lines).
3. Click Format or Minify to update the editor only.
4. Click Copy for the clipboard, or Save to pick a path (rename allowed); after success the button shows Auto-saving and later edits write back.
5. Syntax errors show below the editor and clear as you fix them.
6. Reset clears content and returns to the entry cards.

Notes

• Local-only processing.
• .json only, max 2MB upload; very large documents may lag.
• Format / minify overwrite the current buffer.

Related Keywords

JSON Editor, JSON Formatter, JSON Minifier, Online JSON, jsonfmt, Sanye Hub, Online Tools, JSON