JSON 13 — Free Online JSON Viewer
JSON 13 is the ultimate tool to visualize, format and explore JSON data in an interactive, visual way. With colorful blocks organized by depth hierarchy using a temperature-based color system (hot for root, cold for deep levels), JSON 13 transforms raw data into a unique visual experience.
JSON 13 Features
- Online JSON viewer with colorful LEGO-style blocks
- JSON formatter and beautifier with auto-indentation
- JSON validator with clear error messages
- Expand and collapse JSON blocks by depth level
- Select individual JSON blocks for export
- Export selection as formatted JSON file
- Export selection as styled HTML page
- Copy individual blocks or values to clipboard
- Search by keys or values within JSON
- Visual hierarchy using temperature colors (hot→cold)
- Drag and drop JSON or TXT files
- 100% free, no signup, no data sent to servers
- Works directly in the browser — fast and secure
How to use JSON13 and KILLING TOOLS
Paste your JSON in the input field, click "Slash JSON" and explore the interactive visualization. Select the blocks you want using checkboxes and export as JSON or HTML.
Frequently Asked Questions
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data-interchange format, easy for humans to read and write and easy for machines to parse and generate.
Is JSON13 and KILLING TOOLS secure?
Yes. All processing happens locally in your browser. Your JSON data is never sent to any server.
Can I use it on mobile devices?
Yes, JSON13 and KILLING TOOLS is fully responsive and works on smartphones, tablets and desktops.