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JSON / XML Formatter Online Free — PrivaTools

TL;DR: Paste JSON or XML and instantly see it pretty-printed with syntax highlighting — runs in your browser.

Format JSON and XML online for free — paste, prettify, validate, and highlight syntax errors instantly. 100% offline processing. Sensitive data never leaves your browser.

Like the rest of the 179-tool PrivaTools suite, JSON / XML Formatter is MIT-licensed and self-hostable. The public demo deletes your file as soon as the response leaves the server — verifiable in the open-source codebase on GitHub.

How to Use JSON / XML Formatter

  1. Paste JSON or XML — Or upload a file. Auto-detects format from braces / tags.
  2. Click Format — Adds indentation, proper line breaks, sorted keys (optional). Removes extra whitespace.
  3. Copy or download the result — Runs entirely in your browser.

Frequently Asked Questions

Will it validate the input?

Yes — invalid JSON / XML shows an error with the line and column. Common errors (trailing commas, unclosed strings, mismatched tags) are highlighted.

Can it convert JSON ↔ XML?

This tool only formats. For conversion, paste into the CSV/JSON converter or use a dedicated converter.

Is the indent customizable?

Yes — 2 spaces, 4 spaces, or tabs.

Last reviewed 2026-05-01 by the PrivaTools maintainers. Source code on (MIT-licensed, self-hostable).

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