JSON Formatter
Pretty-print JSON with validation, entirely in your browser.
Your input stays in your browser. Nothing is uploaded.
Valid JSON
Input
Output
About this tool
JSON.parse reads the input, then JSON.stringify reprints it with indentation. There is no eval and no server round-trip.
How it works
Paste JSON on the left, then Format or Minify. A badge shows whether the input is valid. Copy the output when you need it.
JSON.stringify(JSON.parse(input), null, 2)
Examples
Compact object
{"a":1} becomes a two-line indented object.
FAQ
Why did formatting fail?
The input is not valid JSON. Trailing commas and comments are not allowed in standard JSON.
Is my data uploaded?
No. Formatting, encoding, and generation run in your browser.
Can I use this offline after the page loads?
Yes, as long as the page stays open. Nothing is sent to a SmartKitio API.