What is CONSTANT_CASE?

CONSTANT_CASE (also called SCREAMING_SNAKE_CASE) is a naming convention where all letters are uppercase and words are separated by underscores. Example: maxRetryCount becomes MAX_RETRY_COUNT.

How does the tool handle camelCase input?

camelCase and PascalCase boundaries are detected automatically. For example, myApiKey becomes MY_API_KEY and HTTPStatusCode becomes HTTP_STATUS_CODE.

Are numbers preserved?

Yes. Digits are kept as-is. For example, address2Line becomes ADDRESS_2_LINE, and http2Request becomes HTTP_2_REQUEST.

What characters are stripped?

All characters that are not letters, digits, or word separators (spaces, hyphens, underscores, dots, slashes) are removed before conversion. Word separators themselves become underscores.

Can I convert multiple lines at once?

Yes. Each line is converted independently, so you can paste a list of names and get back a list of CONSTANT_CASE equivalents.

CONSTANT_CASE Converter

Name: CONSTANT_CASE Converter
Availability: InStock
Author: Nham Vu

Paste any text and instantly convert it to CONSTANT_CASE (SCREAMING_SNAKE_CASE) for use as programming constants or environment variables.

Input Text

CONSTANT_CASE Output 0 lines

Conversion Examples

maxRetryCount MAX_RETRY_COUNT

my-api-key MY_API_KEY

user profile url USER_PROFILE_URL

HTTPStatusCode HTTP_STATUS_CODE

database_host_name DATABASE_HOST_NAME

react.app.base_url REACT_APP_BASE_URL

Summary

Paste any text and instantly convert it to CONSTANT_CASE (SCREAMING_SNAKE_CASE) for use as programming constants or environment variables.

How it works

Paste or type your text into the input box.
The tool splits words on spaces, hyphens, underscores, dots, slashes, and camelCase boundaries.
All non-alphanumeric characters are removed.
Words are joined with underscores and converted to uppercase.
Click Copy to copy the result to your clipboard.

Use cases

Naming constants in JavaScript, Python, Java, or C/C++ source files.
Formatting environment variable names for .env files and Docker configs.
Generating database column names for legacy schemas that use UPPER_SNAKE conventions.
Converting config keys to the correct format for shell scripts.
Batch-converting a list of property names to constant declarations.
Standardizing naming across a codebase during a refactor.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu