title: parseCookie tags: browser,string,intermediate

Parse an HTTP Cookie header string and return an object of all cookie name-value pairs.

Use String.prototype.split(';') to separate key-value pairs from each other. Use Array.prototype.map() and String.prototype.split('=') to separate keys from values in each pair. Use Array.prototype.reduce() and decodeURIComponent() to create an object with all key-value pairs.

const parseCookie = (str: string) =>
  str
    .split(";")
    .map((v) => v.split("="))
    .reduce((acc, v) => {
      acc[decodeURIComponent(v[0].trim())] = decodeURIComponent(v[1].trim());
      return acc;
    }, {} as AnyObject<string>);

parseCookie("foo=bar; equation=E%3Dmc%5E2"); // { foo: 'bar', equation: 'E=mc^2' }