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CONSTANT_CASE ConverterConvert text to CONSTANT_CASE (SCREAMING_SNAKE_CASE) for constants.

CONSTANT_CASE Converter illustration
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CONSTANT_CASE Converter

Convert text to CONSTANT_CASE (SCREAMING_SNAKE_CASE) for constants.

How to Use
1

Enter Text

Type or paste text to convert to CONSTANT_CASE.

2

View Result

See text in uppercase with underscores between words.

3

Copy & Use

Copy for use as constant names or environment variables.

What Is CONSTANT_CASE Converter?

A CONSTANT_CASE converter transforms text into CONSTANT_CASE (also called SCREAMING_SNAKE_CASE), where all letters are uppercase and words are separated by underscores. This is the universal naming convention for constants, environment variables, and configuration keys across virtually all programming languages. Examples: "max retries" becomes "MAX_RETRIES", "apiBaseUrl" becomes "API_BASE_URL". The uppercase format visually distinguishes constants from regular variables, making code more readable and signaling that these values should not be modified.

Why Use Our CONSTANT_CASE Converter?

  • Universal convention for constants in all major programming languages
  • Standard for environment variables and configuration keys
  • Visual distinction from regular variables
  • Handles conversion from any input format
  • Essential for .env files and config definitions

Common Use Cases

Constants Definition

Format constant names following language conventions: MAX_RETRY_COUNT, DEFAULT_TIMEOUT, API_VERSION.

Environment Variables

Create properly formatted .env variable names: DATABASE_URL, JWT_SECRET, NODE_ENV.

Configuration Keys

Format configuration constants for application settings files.

Enum Values

Create CONSTANT_CASE enum values used in many languages for status codes and categories.

Technical Guide

CONSTANT_CASE conversion combines the word-splitting logic of snake_case with uppercase transformation. Input is split into words using whitespace, separators, and case transitions, then each word is converted to uppercase, and words are joined with underscores. The algorithm handles the same edge cases as snake_case: acronyms, numbers, mixed formats, and consecutive separators. The result is always uppercase with single underscores between words, suitable for use as a constant or environment variable name in any programming language.

Tips & Best Practices

  • 1
    Use CONSTANT_CASE for values that never change: PI, MAX_INT, DEFAULT_TIMEOUT
  • 2
    Environment variables should always be CONSTANT_CASE: DATABASE_URL, API_KEY
  • 3
    In JavaScript, Object.freeze() with CONSTANT_CASE names clearly signals immutability
  • 4
    Python constants are CONSTANT_CASE by convention, though not enforced by the language
  • 5
    Group related constants with a common prefix: COLOR_RED, COLOR_BLUE, COLOR_GREEN

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Frequently Asked Questions

QWhat is CONSTANT_CASE?
CONSTANT_CASE uses all uppercase letters with underscores between words: MAX_VALUE, API_BASE_URL, DEFAULT_TIMEOUT.
QWhy is it called SCREAMING_SNAKE_CASE?
It's snake_case (underscores between words) but "screaming" because all letters are uppercase, like shouting.
QWhich languages use CONSTANT_CASE?
Virtually all: JavaScript, Python, Java, C, C++, Ruby, Go, Rust, and more use CONSTANT_CASE for constants.
QAre environment variables always CONSTANT_CASE?
By overwhelming convention, yes. Environment variables use CONSTANT_CASE across all operating systems and platforms.
QIs CONSTANT_CASE enforced by compilers?
In most languages, it's a convention, not a requirement. Rust and some linters will warn if constants don't use this format.

About CONSTANT_CASE Converter

CONSTANT_CASE Converter is a free online tool from FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration required. No ads. Just fast, reliable tools.