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Discover tools from different categories to expand your toolkit beyond Developer's World.

Validate JavaScript syntax and detect errors before runtime with instant feedback and line numbers.

Check if a year is a leap year or find the next leap year with our free calculator. Learn about leap year rules and why we need them.

Discover healthy recipes and analyze their nutritional content. Search recipes by dietary preferences, calorie goals, and nutritional requirements.

Calculate circle properties: radius, diameter, circumference, and area from any one value