Overview The String Case Converter transforms text between common programming case styles. Intelligently parses existing casing and converts to the target format, handling transitions between all case styles.
Use Cases
API Design : Convert field names between conventionsCode Migration : Change variable naming conventionsDatabase Schema : Convert column names to snake_caseURL Slugs : Generate kebab-case slugs from titlesConstant Generation : Convert to SCREAMING_SNAKE_CASETitle Formatting : Convert to Title Case for display
Any text in any case style:
Case Styles camelCase (default) First word lowercase, subsequent words capitalized:
helloWorld userProfileSettings httpResponseCode
PascalCase All words capitalized, no separators:
HelloWorld UserProfileSettings HttpResponseCode
snake_case All lowercase, words separated by underscores:
hello_world user_profile_settings http_response_code
kebab-case All lowercase, words separated by hyphens:
hello-world user-profile-settings http-response-code
SCREAMING_SNAKE_CASE All uppercase, words separated by underscores:
HELLO_WORLD USER_PROFILE_SETTINGS HTTP_RESPONSE_CODE
Title Case First letter of each word capitalized, spaces between:
Hello World User Profile Settings Http Response Code
Converted string in target case style:
Examples Input: camelCase to snake_case
Output (snake_case)
Input: snake_case to camelCase
Output (camelCase)
Input: kebab-case to PascalCase
Output (PascalCase)
Input: Title to SCREAMING_SNAKE_CASE
Output (SCREAMING_SNAKE_CASE)
Input: PascalCase to kebab-case
Output (kebab-case)
Input: Mixed to Title Case
Output (Title Case)
Input: Acronyms
Output (snake_case)
Conversion Matrix From → To camelCase PascalCase snake_case kebab-case SCREAMING Title camelCase - ✓ ✓ ✓ ✓ ✓ PascalCase ✓ - ✓ ✓ ✓ ✓ snake_case ✓ ✓ - ✓ ✓ ✓ kebab-case ✓ ✓ ✓ - ✓ ✓ SCREAMING ✓ ✓ ✓ ✓ - ✓ Title ✓ ✓ ✓ ✓ ✓ -
Implementation Details From lib/tools/engine.ts:804-821:
case 'string-case' : { const words = input .replace(/( [a - z])([ A - Z ])/g, '$1 $2') // Split camelCase .replace(/[_\ - ]+/g, ' ') // Replace _ and - with space .trim() .split(/\s+/) .filter(Boolean) .map((w) => w.toLowerCase()); if (!words.length) return { output: '' }; switch ( action ) { case 'pascal' : return { output: words . map (( w ) => w [ 0 ]. toUpperCase () + w . slice ( 1 )). join ( '' ) }; case 'snake' : return { output: words . join ( '_' ) }; case 'kebab' : return { output: words . join ( '-' ) }; case 'screaming' : return { output: words . join ( '_' ). toUpperCase () }; case 'title' : return { output: words . map (( w ) => w [ 0 ]. toUpperCase () + w . slice ( 1 )). join ( ' ' ) }; default : return { output: words [ 0 ] + words . slice ( 1 ). map (( w ) => w [ 0 ]. toUpperCase () + w . slice ( 1 )). join ( '' ) }; } }
Word Splitting Algorithm :
Insert spaces before uppercase letters preceded by lowercase (camelCase split)
Replace underscores and hyphens with spaces
Trim and split on whitespace
Convert all words to lowercase
Apply target case transformation
Edge Cases Acronyms HTTPSConnection → https_connection
Consecutive capitals are treated as one word.
Numbers version2API → version_2_api
Numbers are preserved as separate tokens.
Special Characters Non-alphanumeric characters are removed (except _ and - in source).
Returns empty string.
Common Use Cases JavaScript to Python userFirstName → user_first_name
JSON to Database URL Slug Generation New Product Launch → new-product-launch
Constants maxRetryCount → MAX_RETRY_COUNT
CSS Classes primaryButton → primary-button
The String Case Converter uses a simple but effective algorithm that handles transitions between all common case styles without requiring knowledge of the source format.
For API field conversion, batch multiple fields by converting them one at a time, or use find-and-replace in your editor after converting a sample field name.
The converter cannot distinguish between acronyms and normal words. “API” becomes “api” in snake_case, not “a_p_i”. Manually adjust acronyms if needed.
