Constant Case Converter

Convert text to CONSTANT_CASE (e.g., HELLO_WORLD) for constants and environment variables.

HELLO_WORLD_EXAMPLE

Continue with Related Tools

snake_case

Python/database naming.

dot.case

Config file keys.

camelCase

JavaScript variables.

What is CONSTANT_CASE?

The CONSTANT_CASE Converter (also known as SCREAMING_SNAKE_CASE) transforms text into all UPPERCASE letters with underscores separating words. It's the universal standard for constants, environment variables, and configuration keys across all programming languages.

Premium Features

Live Conversion

Instant CONSTANT_CASE results as you type.

File Upload

Load .txt files with environment variables.

Batch Mode

Convert multiple constants at once.

Common Use Cases

Environment Variables

Format environment variables for .env files. Standard for DATABASE_URL, API_KEY, PORT, and all config variables.

Programming Constants

Convert constant names for JavaScript, Python, Java, C++, and all programming languages. Universal standard.

Config Files

Format configuration keys for app settings, feature flags, and system parameters.

Global Settings

Convert global setting names for maximum visibility and easy identification in code.

Need Other Programming Cases?

Check out our camelCase, snake_case, kebab-case, PascalCase, and dot.case converters.

Explore All Case Options →

CONSTANT_CASE Naming Rules

Format:

  • ✓ All UPPERCASE: Every letter is capitalized
  • ✓ Underscores: Words separated by underscores (_)
  • ✓ No other separators: No spaces, hyphens, or special characters
  • ✓ Example: "api base url" → "API_BASE_URL"

Example

Input
database connection url
Output
DATABASE_CONNECTION_URL

Frequently Asked Questions

What is CONSTANT_CASE?

CONSTANT_CASE (also called SCREAMING_SNAKE_CASE) uses all UPPERCASE letters with underscores as separators. For example, 'api key' becomes 'API_KEY'. It's the standard for constants and environment variables across all programming languages.

When should I use CONSTANT_CASE?

Use CONSTANT_CASE for: Constants in any programming language, environment variables (.env files), configuration keys, global settings, feature flags, and any value that shouldn't change at runtime.

What's the difference between CONSTANT_CASE and snake_case?

CONSTANT_CASE uses all uppercase letters (API_BASE_URL), while snake_case uses all lowercase (api_base_url). CONSTANT_CASE is for constants and environment variables, while snake_case is for regular variables and functions, particularly in Python.

Can I convert multiple environment variables at once?

Yes! Enable Batch Mode to convert multiple constant or environment variable names line-by-line. Perfect for formatting entire .env files or config files.

Is CONSTANT_CASE universal across languages?

Yes! CONSTANT_CASE is one of the few naming conventions used consistently across almost all programming languages including JavaScript, Python, Java, C++, PHP, Ruby, Go, and more.

Can I upload a file with constant names?

Yes! Click the Upload icon to load a .txt file (max 1MB) containing constant or environment variable names. Useful for batch converting configuration files.

Is my config data saved or stored?

No. All conversion happens 100% client-side in your browser. Your configuration data and variable names never leave your device.

Is this CONSTANT_CASE converter free?

Yes, completely free with no registration, hidden fees, or limitations. Use it for personal or commercial projects.