Convert Text to CONSTANT_CASE (SCREAMING_SNAKE_CASE)

Converting Text to CONSTANT_CASE

CONSTANT_CASE (also called SCREAMING_SNAKE_CASE or UPPER_SNAKE_CASE) uppercases every letter and separates words with underscores. It is the universally recognized convention for constants and configuration values across programming languages.

Basic Conversion

Input:  max retry count
Output: MAX_RETRY_COUNT

Input:  backgroundColor
Output: BACKGROUND_COLOR

Input:  api-base-url
Output: API_BASE_URL

Where CONSTANT_CASE Is Used

Constants

// JavaScript / TypeScript
const MAX_RETRIES = 3;
const DEFAULT_TIMEOUT_MS = 5000;
const PI = 3.14159265359;

// Java
public static final int MAX_CONNECTIONS = 100;
public static final String DEFAULT_CHARSET = "UTF-8";

# Python
MAX_RETRIES = 3
DATABASE_URL = "postgresql://localhost/mydb"

Environment Variables

export DATABASE_URL="postgresql://localhost:5432/mydb"
export NODE_ENV="production"
export AWS_ACCESS_KEY_ID="AKIA..."
export NEXT_PUBLIC_API_URL="https://api.example.com"

Environment variables are universally written in CONSTANT_CASE across all operating systems and container platforms.

Enum Values

// TypeScript enum
enum HttpStatus {
  OK = 200,
  NOT_FOUND = 404,
  INTERNAL_SERVER_ERROR = 500,
}

// Python enum
class Color(Enum):
    DARK_RED = "#8B0000"
    FOREST_GREEN = "#228B22"
    ROYAL_BLUE = "#4169E1"

Conversion Algorithm

1. Split the input into words (by spaces, hyphens, dots, or case transitions).
2. Uppercase every word.
3. Join with underscores (_).

CONSTANT_CASE vs. snake_case

CONSTANT_CASE: MAX_RETRY_COUNT
snake_case:    max_retry_count

Same structure, different casing. CONSTANT_CASE signals "this value should not be reassigned."

Handling Acronyms

Acronyms remain fully uppercased since the entire string is uppercase:

"http response code" → HTTP_RESPONSE_CODE
"xml parser"         → XML_PARSER
"api base url"       → API_BASE_URL

Edge Cases

• Single word: "timeout" → "TIMEOUT".
• Already CONSTANT_CASE: passes through unchanged.
• Numbers: "http2MaxStreams" → "HTTP_2_MAX_STREAMS" or "HTTP2_MAX_STREAMS".
• Leading/trailing delimiters: trimmed before conversion.