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camelCase to CONSTANT_CASE

camelCase is common for JavaScript / TypeScript / Java variables and JSON keys in many web APIs; CONSTANT_CASE is used for constants and environment variables. Moving data between languages, databases and APIs often means converting between the two.

Examples

camelCase CONSTANT_CASE
maxRetries MAX_RETRIES
apiBaseUrl API_BASE_URL
defaultTimeout DEFAULT_TIMEOUT
enableCache ENABLE_CACHE
pageSize PAGE_SIZE

Try it

camelCase 
 
 
 PascalCase  
 
 
 
 snake_case  
 
 
 
 CONSTANT_CASE  
 
 
 
 kebab-case  
 
 
 
 Train-Case  
 
 
 
 dot.case  
 
 
 
 path/case  
 
 
 
 Title Case  
 
 
 
 Sentence case  
 
 
 
 lowercase  
 
 
 
 UPPERCASE  
 
 
 
 
  
 
    
In code
 
 
 
JavaScript
 
const toConstant = (s) => s.replace(/([a-z\d])([A-Z])/g, '$1_$2').toUpperCase();
 
 
Python
 
import re

def to_constant(s: str) -> str:
    return re.sub(r'([a-z\d])([A-Z])', r'\1_\2', s).upper()
 
 
  
More examples
  
 Open the full Case Converter →