base64-extension (npm): Get base64 image extension 
Keywords: base64|node|nodejs|extension|extname-image-base64|extname image base64|ext|base64 extname|base64-extname|extname-base64|extname base64|ext-base64|ext base64|ext base64 image|ext base64-image|ext-base64-image|extname base64-image|extname-base64-image|extname base64 image|base64-extname-image|base64 extname image|base64 extname-image