--- title: JavaScript object immutability: Object.freeze vs.... description: Immutability in JavaScript means that further changes to an object will not apply. This is, to an extent, what the const keyword achieves: it creates a... canonical: https://daily.dev/posts/javascript-object-immutability-object-freeze-vs-object-seal-lgwknsswg twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: JavaScript object immutability: Object.freeze vs. Object.seal | daily.dev og:description: Immutability in JavaScript means that further changes to an object will not apply. This is, to an extent, what the const keyword achieves: it creates a... og:url: https://daily.dev/posts/javascript-object-immutability-object-freeze-vs-object-seal-lgwknsswg og:image: https://api.daily.dev/og/posts/LgWkNSswG.png og:image:alt: JavaScript object immutability: Object.freeze vs. Object.seal og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # JavaScript object immutability: Object.freeze vs. Object.seal **[LogRocket](https://daily.dev/sources/logrocket)** · 11 min read · 9 upvotes · 0 comments ## Summary Immutability in JavaScript means that further changes to an object will not apply. This is, to an extent, what the const keyword achieves: it creates a reference to a value. JavaScript provides three methods that perform varying levels of restriction to objects. These include Objectfree() and Objectsealse() and the freeze() and seal() methods. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#javascript](https://daily.dev/tags/javascript) [View this post on daily.dev](https://daily.dev/posts/javascript-object-immutability-object-freeze-vs-object-seal-lgwknsswg) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"JavaScript object immutability: Object.freeze vs. Object.seal","url":"https://daily.dev/posts/javascript-object-immutability-object-freeze-vs-object-seal-lgwknsswg","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/javascript-object-immutability-object-freeze-vs-object-seal-lgwknsswg"},"datePublished":"2021-09-17T13:07:32.466Z","dateModified":"2021-10-07T14:17:10.317Z","description":"Immutability in JavaScript means that further changes to an object will not apply. This is, to an extent, what the const keyword achieves: it creates a...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/70520535e08681d00c47dc5e30b512af","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/70520535e08681d00c47dc5e30b512af","isAccessibleForFree":true,"articleSection":"LogRocket","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"LogRocket","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/logrocket","url":"https://daily.dev/sources/logrocket"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/javascript-object-immutability-object-freeze-vs-object-seal-lgwknsswg","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":9},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"javascript","timeRequired":"PT11M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"LogRocket","item":"https://daily.dev/sources/logrocket"},{"@type":"ListItem","position":3,"name":"JavaScript object immutability: Object.freeze vs. Object.seal"}]} ```