camelCase to snake_case Converter Online — Variable Naming Converter

Convert camelCase or PascalCase strings to snake_case online. Format database column names, Python variables, and JSON API keys instantly.

✓ Converts camelCase and PascalCase into lowercase words separated by underscores

✓ Handles multi-line code, lists of variable names, or JSON objects

✓ Preserves acronyms and numbers properly

✓ Essential for converting JavaScript models to Python/SQL schemas

How It Works

  1. Paste your camelCase identifiers or code.
  2. Regex identifies uppercase letters and prefixes them with an underscore in lowercase.
  3. Copy the standardized snake_case identifiers.