Converts a string to JSON safe key (property name) by removing unsafe characters and converting to camel case

javascript-string-to-json-safe-key.js

/**
 * Converts a string to JSON safe key (property name) by removing unsafe 
 * characters and converting to camel case
 * @param {string} src - string to convert
 * @Example
 *  stringToJsonSafeKey('r@ndAm wo5d') // rndamWo5d
 * @returns {string} id/key safe string
 */
function stringToJsonSafeKey(src) {

  // remove unsafe characters
  src = (src || '').replace(/[^a-zA-Z0-9-_ ]/g, '').trim();

  // camel case if it contains multiple words, or just lowercase
	return src.split(' ').map(function(word, index) {

        // if it's the first word, lowercase
        if (index === 0) {
            return word.toLowerCase();
        }

        // otherwise upper case the first char and lowercase the rest
        return word.charAt(0).toUpperCase() + word.slice(1).toLowerCase();
    }).join('');
}