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Check & prepare data · Flagship

Validate & format JSON

Check JSON syntax and create readable or compact output without rounding numeric identifiers.

Private by designYour input stays on your device. Processing happens in this browser.
Your workspace

Start with a file

JSON or TXT · UTF-8 only · up to 2 MB. Original number/string tokens are retained; validation happens when you run. Drop here, or use the file picker.

Paste JSON instead (optional)

Optional alternative to a file. Editing this text removes its selected file; source text is never reformatted during loading.

Whole numbers. Minimum 1. Maximum 8.
Ctrl / ⌘ + Enter to run
Result

A clear result starts here

Run the tool to see your output here.

Try the example to explore how it works.
What to know about this tool

Up to 2 MB and 200 nesting levels; expanded output up to 8 MB. Number/string tokens and duplicate properties are preserved, with duplicate warnings. No schema validation, JSONC or automatic repair.

Clear this workspace?

Your inputs, selected files, and current result will be cleared.

Keep the task moving
Explore workflow →
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