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Do you mean that you want to

1. serialize an object
2. then store it in a browser

?

You can do it like this:

const obj = { foo: 'bar' };

// 1. serialize it
const serializedObj = JSON.stringify(obj);

// 2. store it
localStorage.setItem('obj', serializedObj);

No need to "tokenize" (you probably mean base64-encode) it, though if you really want to do that, just do:

const base64Obj = btoa(serializedObj);

When inspecting the variables: