SCREAMING_SNAKE_CASE Converter - Uppercase Constants

A SCREAMING_SNAKE_CASE converter turns phrases into uppercase words separated by underscores. It’s the go-to style for constants, environment variables, and feature flags in many codebases. Processing stays in your browser, keeping inputs private.

1. Enter text: Paste a phrase or label.
2. Convert: Click Convert to get SCREAMING_SNAKE_CASE output.
3. Copy or download: Copy the result or save it as a snippet for your config or code.

• Readable constants: Make configuration keys easy to spot.
• Team consistency: Standardize naming across services and repos.
• Local privacy: No text leaves your device.

Use case 1: Environment variables

Turn database url into DATABASE_URL for .env files.

Use case 2: Feature flags

Create flags like PAYMENTS_CHECKOUT_ENABLED for toggling features.

Use case 3: Shared constants

Define shared constants in uppercase so they stand out in code reviews.

Basic example

Input: api key
Output: API_KEY

Advanced example

Input: max concurrent jobs
Output: MAX_CONCURRENT_JOBS

Extra underscores

Multiple spaces or punctuation can create double underscores. Collapse whitespace before converting.

Numbers and symbols

Numbers remain; unsupported symbols are removed. Add them back if required.

• For variables, switch to the camelCase converter.
• For URLs, use the kebab-case converter.
• Clean input with the remove formatting tool to remove hidden characters.

• Create dot-separated keys with the dot.case converter.
• Convert to snake_case using the snake_case converter.

Conversion happens locally in your browser. No text is uploaded or stored.