Are my files uploaded to a server?

No. All file processing happens locally in your browser using JavaScript. Your files never leave your device and are not uploaded to any server.

Is Simple Toolkit really free?

Yes. Simple Toolkit is completely free with no hidden fees, premium tiers, or paywalls. The project runs on donations from users who find it valuable.

Do I need to create an account?

No. Simple Toolkit requires no signup, login, or account creation. Just visit the site and start using the tools immediately.

Are there any file size limits?

There are no artificial limits imposed by Simple Toolkit. The only limitations are those of your browser and device capabilities.

Data Formatter & Validator

Format, validate, and convert between JSON, YAML, and XML. All processing happens in your browser — no uploads, no tracking, completely private.

Data Formatter & Validator

Source Format

Auto-detect format from input

Input (JSON)

Output (Formatted)

Formatted output will appear here with syntax highlighting...

Private & Secure

All processing happens locally in your browser. No data is uploaded to any server.

Keyboard Shortcuts

Ctrl/Cmd + EnterFormat or Convert

Ctrl/Cmd + MMinify

Ctrl/Cmd + KClear

TabNavigate between elements

Features

Real-Time Validation

Get instant syntax validation with detailed error messages showing exact line and column numbers.

Format Conversion

Convert seamlessly between JSON, YAML, and XML formats with intelligent data structure preservation.

Beautiful Formatting

Automatically beautify and indent your data for maximum readability with industry-standard conventions.

Auto-Detection

Smart format detection automatically identifies whether your input is JSON, YAML, or XML.

High Performance

Process large files up to 10MB with optimized native browser APIs and debounced validation.

100% Private

All processing happens in your browser. Your data never leaves your device or touches our servers.

Perfect For

Developers

•Debug API responses and configuration files
•Convert between data formats for different systems
•Validate JSON schemas and YAML manifests
•Format minified data for readability

Data Analysts

•Clean and format exported data for analysis
•Convert data between different tool formats
•Validate data integrity before import
•Structure nested data for better understanding

100% Private, Instant Processing

This tool runs entirely in your browser using native JavaScript and Web APIs. Your data is never uploaded to any server, stored, or transmitted over the internet. All formatting, validation, and conversion happens locally on your device.

Frequently Asked Questions

What formats are supported?

The tool supports JSON, YAML, and XML. You can format and validate any of these formats, or convert between them. The auto-detection feature can automatically identify your input format.

What's the maximum file size?

You can process data files up to 10MB in size. This limit ensures optimal performance in the browser. For most use cases, this is more than sufficient — most API responses and configuration files are much smaller.

Is this really private?

Yes, absolutely. All processing happens in your browser using JavaScript. Your data never leaves your device. You can even disconnect from the internet after loading the page and the tool will continue to work. No data is sent to our servers or any third party.

How accurate is the error reporting?

Very accurate. For JSON, we use the browser's native parser which provides precise line and column information. For XML, we use the DOMParser API. For YAML, we provide clear error messages that help you quickly identify and fix syntax issues.

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