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Free browser-based developer tools
Format SQL and JSON, or explore a circuit calculation. Tool inputs stay in your browser.
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Format and validate JSON
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Encode or decode URL components
Convert text for use as one URL component, or decode percent-encoded text. The tool does not process a complete URL.
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Electronics · Circuit calculator
Explore a Thevenin equivalent
Adjust a loaded voltage divider and calculate its Thevenin voltage, resistance, load voltage, and load current.
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Featured tutorials and guides
Explore a few practical starting points, then browse the full library for every published lesson.
SQL · Beginner
Start with SQL SELECT and WHERE
Choose columns, filter rows, sort the results, and compare your work with an expected output.
Read the SQL basics lesson
Laravel · Beginner
Follow a Laravel request from URL to response
Trace a real TeachyLeaf page through routing, middleware, a controller, and its Blade layout.
Read the Laravel request lifecycle 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 guide
Electronics · Circuit theory
Thevenin’s theorem: simplify a circuit at its load
Find the equivalent voltage and resistance for a loaded voltage divider, then compare the calculated load values.
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