snake_case Converter
Convert any text to snake_case and all programming naming conventions.
Enter text above and click Convert.
How to Use This Tool
- Paste or type the text you want to reformat into the snake_case Case Converter input area at the top of the page.
- The snake_case Case Converter instantly transforms your text into the target case style as you type, with no button click required.
- Copy the converted result to your clipboard with one click and paste it wherever you need it.
Common Use Cases
- Python variable names: PEP 8 mandates snake_case for functions and variables; convert "getUserData" to "get_user_data" when porting JavaScript logic into Django or Flask backends.
- PostgreSQL columns: Database designers normalize mixed-case column names to lowercase snake_case (user_email, created_at) so SQL avoids quoting and case-folding surprises.
- Ruby on Rails: Rails relies on snake_case for table names, migration files, and ActiveRecord attributes; convert imported schemas to match convention.
Frequently Asked Questions
Why does Python use snake_case instead of camelCase?
PEP 8 specifies snake_case for functions and variables to favor readability with underscores acting as visual separators. The convention dates to early Unix tools and the C standard library, and it's enforced by linters like flake8 and pylint.
How do I convert "XMLHttpRequest" to snake_case?
Insert an underscore before each uppercase letter (except the first), then lowercase everything: xml_http_request. The converter detects acronym boundaries so consecutive capitals collapse correctly instead of becoming x_m_l_http_request.
Can snake_case identifiers contain digits?
Yes. Most languages allow digits in identifiers as long as the name doesn't start with one. "user_id_2024" is valid in Python, Ruby, and Rust, but PostgreSQL limits identifiers to 63 bytes by default.