TypeScript icon, indicating that this package has built-in type declarations

1.0.11 • Public • Published
Cosmic dashboard darkmode

Cosmic JavaScript SDK

Cosmic is a headless CMS (content management system) that provides a web dashboard to create content and an API toolkit to deliver content to any website or application. Nearly any type of content can be built using the dashboard and delivered using this SDK.

Get started free →


Install the Cosmic JavaScript SDK. We recommend using the bun package manager.

bun add @cosmicjs/sdk
# OR
yarn add @cosmicjs/sdk
# OR
npm install @cosmicjs/sdk


Import Cosmic into your app using the createBucketClient method.

import { createBucketClient } from '@cosmicjs/sdk';


In the Cosmic admin dashboard go to Bucket > Settings > API Access and get your Bucket slug and read key then set the variables in your app to connect to your Bucket.

const cosmic = createBucketClient({
  bucketSlug: 'BUCKET_SLUG',
  readKey: 'BUCKET_READ_KEY',

Get Objects

Objects are the basic building blocks of content in Cosmic.

Get multiple Objects [see docs]

Use the objects.find() method to fetch Objects.

const posts = await cosmic.objects
    type: 'posts',
  .props(['title', 'slug', 'metadata'])

The above example fetches Objects in the posts Object type returning the title, slug, and metadata properties, limiting the response to 10 Objects.

Get single Object by slug [see docs]

Use the objects.findOne() method with type and slug to fetch a single Object.

const post = await cosmic.objects
    type: 'pages',
    slug: 'home',
  .props(['title', 'slug', 'metadata']);

Create, update, and delete Objects

To write to the Cosmic API, you will need to set the Bucket write key found in Bucket > Settings > API Access. (NOTE: never expose your write key in any client-side code)

const cosmic = createBucketClient({
  bucketSlug: 'BUCKET_SLUG',
  readKey: 'BUCKET_READ_KEY',
  writeKey: 'BUCKET_WRITE_KEY',

Create Object [see docs]

Use the objects.insertOne() method to create an Object.

await cosmic.objects.insertOne({
  title: 'Blog Post Title',
  type: 'posts',
  metadata: {
    content: 'Here is the blog post content... still learning',
    seo_description: 'This is the blog post SEO description.',
    featured_post: true,
    tags: ['javascript', 'cms'],

Update Object [see docs]

Use the objects.updateOne() method to update an Object by specifying the Object id and include properties that you want to update.

await cosmic.objects.updateOne('5ff75368c2dfa81a91695cec', {
  metadata: {
    content: 'This is the updated blog post content... I got it now!',
    featured_post: false,

Delete Object [see docs]

Use the objects.deleteOne() method to delete an Object by specifying the Object id.

await cosmic.objects.deleteOne('5ff75368c2dfa81a91695cec');

Learn more

Go to the Cosmic docs to learn more capabilities.

Community support

For additional help, you can use one of these channels to ask a question:

  • GitHub (Bug reports, contributions)
  • Twitter (Get the latest news about Cosmic features and notifications)
  • YouTube (Learn from video tutorials)

Cosmic support

  • Contact us for help with any service questions and custom plan inquiries.


This project uses changeset to manage releases. Follow the following steps to add a changeset:

  • Run npm run changeset command and select type of release with description of changes.
  • When PR with changeset is merged into main branch, Github will create a new PR with correct version change and changelog edits.
  • When codeowner merges the generated PR, it will publish the package and create a Github release.


This project is published under the MIT license.

Package Sidebar


npm i @cosmicjs/sdk

Weekly Downloads






Unpacked Size

24.6 kB

Total Files


Last publish


  • rajatkaush1k
  • jazibsawar
  • tonyspiro