The Developers Essential Tool for JSON Formatting and Conversion

In the world of web development and APIs, JSON (JavaScript Object Notation) has become the go-to data format for transmitting information. Whether you're debugging API responses, preparing payloads for production, or simply trying to read through an unreadable JSON file, having the right tool can save you hours of work.

That’s why I built Format JSON Online — a privacy-focused, lightweight, and feature-rich tool designed to make working with JSON effortless.

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Why Format JSON Online?

Most online JSON formatters come with a catch — file size limits, login walls, server-based data processing, or aggressive ads. I experienced all of these frustrations personally, which pushed me to create a tool that:

•  Works completely in your browser

• Keeps your data private (nothing is sent to a server)

• Doesn’t require login or signup

• Handles large files up to 30MB

• Includes useful developer utilities beyond basic formatting

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Key Features

Here’s what makes Format JSON Online stand out:

 JSON Formatter & Beautifier

Paste your raw JSON and instantly see a clean, formatted version.

 JSON Validator

Quickly find and fix syntax errors in your JSON.

JSON Minifier

Reduce your JSON to a compact, single-line version for production use.

JSON Converters

Convert JSON to:

• CSV

• XML

• Dart

• Stringified JSON

JSON Comparison

Compare two JSON files side-by-side and visually spot differences.

JSON Filter

Use JSONPath to extract specific data from large JSON payloads.

AI JSON Generator

Describe a structure in plain English and get valid JSON using built-in AI assistance.

⚙️ cURL Generator

Convert your JSON into ready-to-use curl commands for API testing.

SQL Formatter (NEW)

Paste your SQL queries for clean, formatted output — perfect for full-stack developers.

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Developer-Centric and Privacy-First

Unlike many tools that upload your data to the cloud, Format JSON Online is entirely browser-based. That means your JSON never leaves your device. It’s built for developers who care about speed, simplicity, and privacy.

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Built for Indie Devs, By an Indie Dev

I’m Anil Peter, an indie developer and front-end engineer with a passion for building helpful tools for the community. This project is completely bootstrapped, and I'm continually adding new features based on feedback.

I recently added AI-powered JSON generation and SQL formatting, with more features like JSON schema-based auto-completion and browser extension support on the roadmap.

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Future Plans

While the tool is free, I may introduce light, non-intrusive ads in the future to support maintenance and hosting costs. But one thing is clear — user experience and data privacy will always remain the top priority.

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Try It Out

Visit: https://www.formatjsononline.com

Whether you’re a developer, tester, student, or someone dealing with JSON daily — give Format JSON Online a try and simplify your workflow.