jsonstringify

function JSONstringify( obj ) {
    var val, results = [];
    results.push('{')
    for(var key in obj) {
        val = obj[key];
        results.push('"'+ key + '": ')
        if (typeof(val) === 'number') {
            results.push(val)
        } else 
        if (typeof(val) === 'string') {
            results.push( '"' + val + '"')
        } else 
        if (typeof(val) === 'object') {
               if (val instanceof Array) {
                results.push('[')
                for(var i=0; i < val.length; i++) {
                  if (typeof(val[i]) === 'object') {
                  	results.push(JSONstringify(val[i]))
                  } else {
                  	results.push(val[i])
                  }
                  results.push(', ')
                } 
                results.pop();
                results.push("]")
               } else {
                results.push(JSONstringify(val));
               }
        }
        results.push(', ');
    }
    results.pop();
		results.push('}')
    
    return results.join('');
}

console.log(JSONstringify(
  { a: { 
    b: 1,
    c: "string hello",
    d: [1,"2", {e:"one"}]
   },
   f:"1234"
  }
  )
)