snake_case Converter

In short snake_case joins words with underscores and keeps everything lowercase, so "Total Order Value" becomes total_order_value. It is the standard for variables and functions in Python and Ruby, for database column names in PostgreSQL and MySQL, and for file names where spaces cause trouble. The reason databases favour it is practical: unquoted identifiers are case-folded by most SQL engines, so TotalOrderValue and totalordervalue are the same column and the capitals do nothing, while underscores survive. PostgreSQL folds to lowercase, SQL Server does not fold at all, and relying on capitals to separate words across both is a portability problem that snake_case simply does not have. Converting into snake_case is lossless from any form that marks word boundaries; converting out of it into camelCase or PascalCase is equally clean, which makes snake_case a good intermediate when moving names between a Python backend and a JavaScript frontend. The uppercase variant, CONSTANT_CASE, is the same convention for values that never change.