# Format JSON Online

> A privacy-first suite of 60+ free JSON tools for developers. Format, validate, minify, and convert JSON data. All core processing runs 100% client-side in your browser — your data never leaves your device. No signup or installation required. Trusted by 20,000+ developers.

Built by Anil Peter, Full-Stack Software Engineer. Available at https://formatjsononline.com

## Core JSON Tools

- [JSON Formatter](https://formatjsononline.com/json-formatter): Beautify and pretty-print JSON with configurable indentation (2–8 spaces or tabs), key sorting, and syntax highlighting. Supports files up to 100MB.
- [JSON Minifier](https://formatjsononline.com/json-minifier): Compress JSON by removing all whitespace, reducing file size by 30–50% for production APIs and bundles.
- [JSON Validator](https://formatjsononline.com/json-validator): Validate JSON syntax against RFC 8259 with line-level error highlighting, detailed error messages, and AI-powered auto-fix for common mistakes.
- [JSON Compare](https://formatjsononline.com/json-compare): Diff two JSON structures side-by-side with highlighted changes.
- [JSON Visualizer](https://formatjsononline.com/json-visualizer): Explore JSON in an interactive, collapsible tree view with inline image URL previews.
- [JSON Schema Generator](https://formatjsononline.com/json-schema-generator): Generate a JSON Schema from valid JSON for use in validation workflows.
- [JSON Escape / Unescape](https://formatjsononline.com/json-escape-unescape): Escape or unescape special characters in JSON strings.
- [JSON Size Calculator](https://formatjsononline.com/json-size-calculator): Measure the byte size of JSON payloads.
- [JSON Editor](https://formatjsononline.com/json-editor): Rich in-browser editor with live validation and tree view.
- [JSON Playground](https://formatjsononline.com/json-playground): Experiment with JSON transformations interactively.
- [AI JSON Generator](https://formatjsononline.com/ai-json-generator): Generate JSON structures using AI.

## JSON Converters

- [JSON to CSV](https://formatjsononline.com/json-to-csv): Convert JSON arrays to comma-separated values.
- [JSON to Excel](https://formatjsononline.com/json-to-excel): Export JSON data as a spreadsheet-ready Excel file.
- [JSON to XML](https://formatjsononline.com/json-to-xml): Convert JSON to XML format.
- [JSON to YAML](https://formatjsononline.com/json-to-yaml): Convert JSON to YAML configuration format.
- [JSON to SQL](https://formatjsononline.com/json-to-sql): Generate SQL INSERT statements from JSON data.
- [JSON to TypeScript](https://formatjsononline.com/json-to-typescript): Generate TypeScript interfaces from JSON.
- [JSON to C#](https://formatjsononline.com/json-to-csharp): Generate C# classes from JSON.
- [JSON to Python](https://formatjsononline.com/json-to-python): Generate Python dataclass or dict representations from JSON.
- [JSON to HTML](https://formatjsononline.com/json-to-html): Convert JSON to an HTML table.
- [JSON to Table](https://formatjsononline.com/json-to-table): Render JSON data as a formatted table.
- [JSON to TOON](https://formatjsononline.com/json-to-toon): Convert JSON to TOON (Token-Oriented Object Notation), a compact format optimised for LLMs.

## Other Developer Utilities

- [Dummy JSON Generator](https://formatjsononline.com/dummy-json): Generate realistic fake JSON data for testing.
- [SQL Formatter](https://formatjsononline.com/sql-formatter): Beautify SQL queries.
- [API Tester](https://formatjsononline.com/api-tester): Send HTTP requests and inspect JSON responses directly in the browser.
- [JWT Debugger](https://formatjsononline.com/jwt-debugger): Decode and inspect JSON Web Tokens.
- [UUID Generator](https://formatjsononline.com/uuid-generator): Generate UUIDs/GUIDs.
- [Cron Generator](https://formatjsononline.com/cron-generator): Build and validate cron expressions.
- [JSON Downloads](https://formatjsononline.com/json-downloads): Download sample JSON files for testing.
- [JSON Quiz](https://formatjsononline.com/json-quiz): Interactive quiz to test JSON knowledge.

## Learn

- [All Tutorials](https://formatjsononline.com/learn): JSON best practices, format comparisons, and developer guides.
- [Glossary](https://formatjsononline.com/glossary): Definitions for JSON and related terms.
- [JSON Guide](https://formatjsononline.com/glossary/json): Complete introduction to JSON.

## Available As

- Web app: https://formatjsononline.com
- Chrome Extension: https://chromewebstore.google.com/detail/canjjiieanfcdjhmpfdhdlnldjgeifkp
- VS Code Extension: https://marketplace.visualstudio.com/items?itemName=formatjsononline.formatjsononline
- NPM Package: https://www.npmjs.com/package/json-formatter-tool
- Python CLI (PyPI): https://pypi.org/project/json-formatter-tool/

## About

- [About](https://formatjsononline.com/about): Mission and story behind Format JSON Online.
- [Author](https://formatjsononline.com/author/anil-peter): Anil Peter, Full-Stack Software Engineer.
- [Contact](https://formatjsononline.com/contact): support@formatjsononline.com
- [Privacy Policy](https://formatjsononline.com/privacy)
- [Terms of Service](https://formatjsononline.com/terms)
- [Changelog](https://formatjsononline.com/changelog)
- Twitter: https://twitter.com/@formatjson75
- GitHub: https://github.com/anilpeter75/free-json-formatter