About JSON Tools

A free collection of online JSON utilities for developers

What is JSON Tools?

JSON Tools is a free, privacy-first collection of online utilities designed for developers, data analysts, and anyone working with JSON data. All 9+ tools run entirely in your browser — no data is sent to any server, ensuring your data stays private and secure.

Whether you need to format messy JSON, validate syntax, convert between formats, or compare two JSON objects, JSON Tools has you covered.

Our Mission

We believe every developer deserves access to powerful, fast, and privacy-respecting tools — without paywalls, sign-ups, or data collection. JSON Tools was created with a simple mission: provide the best free JSON utilities on the web while keeping your data 100% private.

In a world where many online tools upload your data to remote servers, we took a different approach. Every operation — from formatting to validation to conversion — happens entirely in your browser using JavaScript. Your JSON data never leaves your device.

About the Developer

JSON Tools is built and maintained by an independent developer passionate about creating useful, well-crafted web tools. The project started in early 2026 as a personal utility and has since grown into a comprehensive suite of 9 specialized JSON tools.

The entire project is built with vanilla HTML, CSS, and JavaScript — no heavy frameworks, no server-side processing, and no dependencies beyond a few lightweight libraries for specific conversion tasks (Papa Parse for CSV and js-yaml for YAML). This keeps the site fast, reliable, and easy to maintain.

Technology & Privacy

  • 100% Client-Side — All JSON processing happens in your browser. Zero data is transmitted to external servers.
  • No Account Required — Use all tools instantly without registration or sign-up.
  • Vanilla JavaScript — No heavy frameworks. Built for speed and minimal resource usage.
  • Responsive Design — Works seamlessly on desktop, tablet, and mobile devices.
  • Dark & Light Mode — Automatic theme switching based on your preference.
  • Hosted on GitHub Pages — Reliable, fast, and globally distributed hosting via CDN.

By the Numbers

9+
Specialized Tools
5
Output Formats
0
Data Uploaded
100%
Free to Use

Available Tools

JSON Viewer & Formatter

Visualize JSON as interactive tree, format with syntax highlighting

JSON Validator

Check JSON syntax with precise error locations and auto-fix

JSON Minify

Compress JSON by removing whitespace, see size reduction

JSON to CSV

Convert JSON arrays to CSV with table preview

CSV to JSON

Convert CSV data to JSON array format

JSON to XML

Convert JSON to well-formatted XML

JSON to YAML

Convert JSON to clean, readable YAML

JSON to TypeScript

Auto-generate TypeScript interfaces from JSON

JSON Diff

Compare two JSON objects and see differences

Key Features

  • 100% Client-Side — All processing happens in your browser. No data is uploaded to any server.
  • Free & Open Source — No registration, no subscription. Supported by minimal, non-intrusive advertising.
  • Fast & Lightweight — Built with vanilla HTML, CSS, and JavaScript for maximum performance.
  • Dark & Light Mode — Switch between themes to match your preference.
  • Mobile Friendly — Responsive design works on all devices.
  • File Support — Drag & drop files or click to upload. Download results as files.

Send Feedback

Found a bug? Have a feature request? We'd love to hear from you. Use the form below to send us your feedback.