Free browser-based tool
Format SQL online
Beautify SQL with selectable dialect, indentation, and keyword case. The formatter changes layout, not query logic.
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Practical learning for electronics and software
Learn technology through clear, practical examples.
Explore browser-based developer tools and step-by-step lessons in programming and electronics. Follow worked examples and know what each tool or lesson can—and cannot—do.
Created by Amit Kumar Das · Meet the founder
Learn with purpose
A practical way to learn technical topics
Build understanding with focused explanations, examples you can follow, and tools that state their limits.
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Start with the idea
Understand the core concept and the assumptions behind it before adding complexity.
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Follow a worked example
See sample inputs, expected results, and explanations that connect the steps to the outcome.
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Know what to trust
Check each tool's privacy and limitations, then verify examples in the environment where you plan to use them.
Build and check
Free browser-based developer tools
Format SQL and JSON in your browser. Your input stays on your device.
Free browser-based tool
Format and validate JSON
Check JSON syntax, format valid data, and get readable parse errors. Your input stays in your browser.
Open the JSON formatterLooking for a particular tool?
Explore all developer toolsLearn by example
Practical tutorials and guides
Follow step-by-step lessons with sample data, expected results, and clear explanations.
SQL · Step-by-step tutorial
Learn SQL INNER JOIN and LEFT JOIN
Compare join results using a small customers-and-orders dataset, with expected rows and explanations of unmatched records.
Read the SQL joins lesson
JSON · Debugging guide
Find and fix common JSON syntax errors
See how missing commas, trailing commas, unquoted keys, and mismatched brackets make JSON invalid.
Read the JSON syntax guideWant to explore more lessons?
Browse all tutorials