Stack Dev Tools

StackDevTools is your all-in-one collection of free online tools made for developers, students, and everyday users. You can easily format and validate JSON, convert data between different formats, or compare text in seconds — all right from your browser.

Use our tools like the JSON Formatter, JSON to YAML Converter, and JSON to XML Converter to clean and organize data instantly. You can also check differences in content using the Text Diff Checker, adjust text styles with the Case Converter, or calculate the age gap between two dates using the Age Difference Calculator.

All our tools are fast, accurate, and designed to make your daily tasks easier — whether you’re coding, writing, or analyzing data. Explore StackDevTools for simple, privacy-safe, and time-saving utilities built to boost your productivity.

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Our Tools

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JSON Formatter

Format and beautify your JSON data with proper indentation and syntax highlighting. Perfect for making messy JSON readable.

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Age Difference Calculator

Find the exact age gap between two people or dates in years, months, and days. Quick, accurate, and easy to use for relationships, family, or research.

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Text Repeater

Instantly repeat any text multiple times with custom separators. Perfect for testing, social posts, and quick content generation.

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Case Converter

Easily change the text capitalization online. Convert to uppercase, lowercase, title case, sentence case, and more instantly.

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JSON to XML Converter

Easily convert JSON data into XML format online. Fast, accurate, and code-free tool to transform JSON to XML instantly.

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JSON to YAML Converter

Easily convert JSON data into YAML format online. Fast, accurate, and code-free tool to transform JSON to YAML instantly.

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Text Difference Checker

Compare two large text blocks side by side and highlight differences with color-coded changes. Useful for code, documents, or long text revisions.

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Why Choose Our Tools?

Working with messy JSON data can be frustrating and time-consuming. That’s why our JSON Formatter is designed to instantly format, beautify, and validate JSON, making it easier to read, debug, and manage data. Instead of struggling with long, unstructured strings, you can paste your JSON, click format, and get clean, well-structured output in seconds. Our JSON Formatter ensures accuracy, speed, and ease of use for developers, students, and professionals alike.

For those who need to convert JSON into other formats, our JSON to XML Converter and JSON to YAML tools are perfect solutions. The JSON to XML Converter allows you to transform JSON data into XML format quickly, while our JSON to YAML tool converts JSON to YAML without errors or complex setup. Both tools are optimized for clarity and efficiency, making it easier to work with structured data in any project.

Another essential tool in our suite is the Case Converter, which helps you change text capitalization instantly. Whether you need uppercase, lowercase, title case, or sentence case, our Case Converter makes text formatting effortless, saving time and ensuring consistency across your content.

Our Text Diff Checker is another powerful feature, enabling you to compare two pieces of text quickly and accurately. Whether you are reviewing code changes, tracking edits in a document, or analyzing configuration files, the Text Diff Checker highlights differences clearly, helping you avoid errors and improve workflow.

What sets StackDevTools apart is the combination of simplicity, speed, and reliability. All tools, including JSON Formatter, JSON to XML Converter, JSON to YAML, Case Converter, and Text Diff Checker, run directly in your browser. There is nothing to download, no complicated setup, and no hidden costs. Every tool is free, ensuring accessibility for developers, students, and professionals everywhere.

While our platform currently features the JSON Formatter, JSON to XML Converter, JSON to YAML, Case Converter, and Text Diff Checker, this is just the beginning. We plan to expand with more practical and powerful online developer tools in the future. With StackDevTools, you always have an easy, accurate, and free solution to format, convert, compare, and manage your data efficiently.