JavaScript Cookies Guide
Cookies store data in the browser and send it with every HTTP request. Used for sessions, personalization, and tracking. The guide walks through Reading & Writing. Read: `document.cookie`. Set: `document.cookie="k=v;path=/;max-age=86400;secure;samesite=lax"`. Options: path, domain, max-age/expires, secure (HTTPS), samesite (Strict/Lax/None), HttpOnly (server). Delete: set max-age=0. The guide is organized into 1 sections that build on each other, each pairing a prose explanation with runnable code. Related guides: Arrays, Strings, Numbers, Math, Date. This is one of 145 JavaScript guides on JS Reference — see the full list on the guides page. Practice what you learn in the JavaScript playground, and look up any unfamiliar term in the JavaScript glossary.