Every time I paste code into an online formatter, I wonder: where does this data go?
Most "free" developer tools run your data through their servers. JSON formatters, CSV converters, Markdown editors — they all need to parse your content, but does that content really need to leave your browser?
The Problem With Server-Side Tools
I tested 10 popular online JSON formatters with a fake API key embedded in the payload:
- 3 sent the data to third-party analytics services
- 2 made unexpected requests to unrelated domains
- 1 stored the data in their database (accessible via API endpoint)
- 4 appeared clean, but you can never be 100% sure
When you paste client code, API keys, personal data, or proprietary configurations into a server-side tool, you're trusting that company with everything in that payload.
The Client-Side Alternative
I built tools.pixiaoli.cn as a collection of 33+ developer tools that run entirely in your browser. No server uploads. No data collection. No analytics tracking your inputs.
Here's how it works:
JSON Formatter & Validator
The browser's native JSON.parse() handles validation, and formatting happens in the DOM. No data is sent anywhere.
CSV Converter
Convert between CSV and JSON without your data ever touching a server. Built with PapaParse running client-side.
WeChat Markdown Editor
Format Markdown for WeChat articles with live preview. Your draft stays in your browser until you copy it.
Why This Matters
- Security: API keys, passwords, and tokens in config files never leave your machine
- Privacy: Personal data in CSVs stays personal
- Speed: No network roundtrip — everything is instant
- Offline: Works without internet once loaded
- Trust: Open source, inspectable, verifiable
What's Included (33+ Tools)
| Category | Tools |
|---|---|
| Text | JSON Formatter, YAML Converter, XML Formatter, Text Diff |
| Data | CSV to JSON, JSON to CSV, Base64 Encoder/Decoder, URL Encoder/Decoder |
| Dev | Regex Tester, JWT Decoder, Hash Generator, Color Converter |
| Markdown | WeChat Editor, Markdown Preview, HTML to Markdown |
| Image | Image Compressor, Format Converter, SVG Optimizer |
| Misc | UUID Generator, Lorem Ipsum, QR Code Generator, Cron Parser |
Try It
Paste any sensitive data — API keys, configs, personal info — and see for yourself. Open DevTools Network tab while using any tool. You'll see zero outgoing requests.
The Philosophy
The web was built to run code locally. JavaScript in the browser is incredibly powerful — there's no reason a JSON formatter needs a server. By keeping everything client-side, we respect both developer productivity and data privacy.
If you've ever hesitated before pasting code into an online tool, you understand why this matters.
Built with vanilla JavaScript and modern web APIs. No frameworks, no tracking, no BS.
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