Online JSON Viewer / Formatter
Powerful web-based JSON manipulation tool for developers
Technologies Used
Screenshots
Clean and intuitive JSON editor interface with syntax highlighting, line numbers, and real-time validation feedback in a professional dark theme
Advanced JSON code editor showing nested data structures with proper indentation, color-coded syntax highlighting, and structured formatting
Interactive tree visualization mode displaying JSON data as connected nodes, making it easy to understand complex data relationships and hierarchy
This open-source JSON viewer and editor is built to streamline the workflow of developers who regularly work with JSON data. It combines powerful editing features with an intuitive interface, making it easy to view, edit, validate, and format JSON documents of any size.
The application is built with Python and FastAPI on the backend to deliver high-performance API endpoints, and modern JavaScript/TypeScript on the frontend for a fast, responsive user experience. It supports multiple view modes, including a syntax-highlighted code view, an interactive tree view for navigating complex structures, and a form view for simplified editing.
Key features:
Monaco Editor: VS Code-style code editor with syntax highlighting, line numbers, and minimap.
JSON Formatting: Paste raw or encoded JSON and format it with proper indentation.
Tree View: Interactive tree view with expand/collapse functionality.
Real-time Validation: Live JSON validation with error highlighting.
Code Folding: Collapse and expand JSON sections.
Theme Support: Light and dark themes with automatic editor theme switching.
Search & Replace: Built-in search functionality with regex support.
Print Support: Print-friendly formatted JSON output.
Copy to Clipboard: One-click copy of formatted JSON.
URL Parameter Support: Load JSON from URL parameters.
Modern UI: Clean, responsive design that works on all devices.
No Database: Simple, stateless application.
JSON Diff View: Compare two JSON objects side-by-side with highlighted differences (additions, deletions, modifications).
JavaScript Object Literal Support: Parse and format JavaScript object literal syntax in addition to standard JSON.
The application is containerized with Docker for easy deployment and scaling, and hosted on AWS for reliability and global accessibility. Whether you're debugging API responses, formatting configuration files, or validating data structures, this tool provides all the functionality you need in a clean, professional interface.
Key Highlights
Real-time JSON validation
Multiple view modes (Code, Tree, Form)
Syntax highlighting and formatting
JSON Schema validation
Large file handling
Export in multiple formats