Mars JSON: The Fastest
Editor on Earth.
Native C++ & Qt 6 Power. Zero-copy parsing. Handle GB-scale JSON files instantly with the speed you deserve.
Tap the pulsing markers to uncover features
Why Mars JSON?
Designed for developers who demand performance without compromise.
Unmatched Speed
Built with C++ & Qt 6. No Electron bloat. Starts in milliseconds.
GB-Scale Ready
Virtual Rendering technology allows you to verify and edit 2GB+ files smoothly.
Smart Formatting
Prettify or minify your code with one click. Handle messy JSON instantly.
Privacy First
100% offline processing. Your sensitive data never leaves your machine.
cURL Integration
Import directly from cURL commands. Perfect for backend debugging.
Smart Views
Tree, Text, and Dual Views with intelligent line numbers and wrapping.
Stop Waiting for Your Editor.
Most JSON editors are built on web technologies (Electron), consuming gigabytes of RAM just to open a simple file. Mars JSON is built differently.
Performance Monitor
Your Data Stays Yours
In an era of cloud-first tools, Mars JSON is proudly offline-first.
100% Offline
No internet connection required. Work securely in air-gapped environments.
Zero Analytics
We don't track your file contents or usage patterns. Your business is your business.
Local Execution
All parsing and processing happens locally on your CPU. No data is ever sent to a server.
Trusted by Power Users
"Finally, an editor that doesn't choke on my server logs. I've switched from VS Code for all my JSON work."
"The cURL import feature saves me 30 mins every day. It's the little details that make this software indispensable."
"Worth every penny for the native performance alone. Virtual rendering is black magic."
Simple Pricing
Pay once, own it forever.
Explorer
Perfect for testing
- 7-Day Full Access
- Max 10MB File Size
- Max 20 Files/Day
Professional
For Power Users
- Lifetime License
- Unlimited File Size (GB+)
- Unlimited Opens
- Prioritized Updates & Support
- Exclusive 'Mars Red' Theme
Frequently Asked Questions
Q.Is this a subscription?
No. The Professional license is a one-time purchase. You own the software forever.
Q.Does it support macOS and Windows?
Yes! Mars JSON is fully optimized for both macOS (Apple Silicon & Intel) and Windows 10/11.
Q.Is it safe for production data?
Absolutely. Mars JSON runs completely offline. No data is ever uploaded to any cloud server.
Recent Updates
Added cURL import support
You can now paste cURL commands directly to import JSON payloads. Useful for backend debugging.
Optimized virtual rendering
Improved scrolling performance for files larger than 5GB. Reduced memory footprint by 20%.
Initial Release
Mars JSON launches with Dual View, Native C++ core, and Zero-copy parsing.