Clear localstorage values with certain prefix

Question

I have stored several key value pairs which contains certain encrypted login information using HTML5 localstorage variables. I have added a unique prefix to all key names say TM_loginname . Now I want to clear all the localstorage key-value pairs whose key starts with prefix TM_. PS: I tried sessionstorage too, but it clears only when browser is closed.

Answer 1

Removing element while iterating is unsafe, so create an array to hold the keys that need to be removed. Then, iterate over that array to remove them:

var arr = []; // Array to hold the keys // Iterate over localStorage and insert the keys that meet the condition into arr for (var i = 0; i < localStorage.length; i++){     if (localStorage.key(i).substring(0,3) == 'TM_') {         arr.push(localStorage.key(i));     } }  // Iterate over arr and remove the items by key for (var i = 0; i < arr.length; i++) {     localStorage.removeItem(arr[i]); }