Free Online JSON Validator
TxtTool
Validate and format JSON data. Find syntax errors with line numbers.Updated 2026-03-20
Frequently Asked Questions
What does it check?
JSON syntax validity with error location.
Can it format?
Yes, pretty-print or minify.
Free?
Yes, runs in browser.
How to Use
- Choose processing options
- Paste text or drag a file into input
- Check statistics panel
- Click Process to transform
FAQ
Can I process text files?
Paste text directly or drag and drop a .txt file onto the input area.
What encodings are supported?
UTF-8, ASCII, Latin-1, and other common encodings are handled automatically.
Does it handle Unicode?
Full Unicode support including emoji, CJK characters, RTL text, and special symbols.
Is there a character limit?
No hard limit. Processes text of any length, though 1M+ characters may take a moment.
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