JSON Formatter & Converter
Format, minify, and convert JSON to TypeScript or C# instantly in your browser.
Why Use OptMyTool's Online JSON Formatter & Converter?
Working with raw, unformatted JSON can be frustrating and prone to error. OptMyTool provides a lightweight, high-speed, 100% browser-based JSON suite designed for software engineers, frontend developers, and data analysts. Prettify nested JSON objects, compress data payloads for API optimization, or automatically generate C# DTO classes and TypeScript interfaces with zero server lag.
🔒 100% Client-Side Privacy
Your API keys, user payloads, and sensitive tokens never leave your browser. All parsing and conversion runs locally via JavaScript.
⚡ Precise Error Locating
No more guessing broken syntax. Instant syntax checking pinpoints missing brackets or quotes with line-level jump navigation.
Frequently Asked Questions
How do I convert JSON to C# classes?
Paste your raw JSON into the input box and click the To C# Class button. Our engine automatically infers field types (integers, strings, booleans, arrays) and outputs strong C# property models ready for ASP.NET / .NET Core.
Is my data sent to any external servers?
No. All JSON processing, validation, minification, and code generation happens strictly inside your local browser runtime.
100% client-side processing. Your data never leaves your browser.