Supabase JS SDK

Isomorphic JavaScript SDK for Supabase - combining Auth, Database, Storage, Functions, and Realtime.

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Usage

First of all, you need to install the library:

``sh
npm install @supabase/supabase-js
`

Then you're able to import the library and establish the connection with the database:

`js
import { createClient } from '@supabase/supabase-js'

// Create a single supabase client for interacting with your database
const supabase = createClient('https://xyzcompany.supabase.co', 'public-anon-key')
`

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You can use plain
`

or even:

`html

`

Then you can use it from a global supabase variable:

`html

`

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You can use
`

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You can use supabase-js in the Deno runtime via JSR:

`js
import { createClient } from 'jsr:@supabase/supabase-js@2'
`

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supabase-js uses the cross-fetch library to make HTTP requests, but an alternative fetch implementation can be provided as an option. This is most useful in environments where cross-fetch is not compatible, for instance Cloudflare Workers:

`js
import { createClient } from '@supabase/supabase-js'

// Provide a custom fetch implementation as an option
const supabase = createClient('https://xyzcompany.supabase.co', 'public-anon-key', {
global: {
fetch: (...args) => fetch(...args),
},
})
`

Support Policy

This section outlines the scope of support for various runtime environments in Supabase JavaScript client.

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We only support Node.js versions that are in Active LTS or Maintenance status as defined by the official Node.js release schedule. This means we support versions that are currently receiving long-term support and critical bug fixes.

When a Node.js version reaches end-of-life and is no longer in Active LTS or Maintenance status, Supabase will drop it in a minor release, and this won't be considered a breaking change.

> ⚠️ Node.js 18 Deprecation Notice
>
> Node.js 18 reached end-of-life on April 30, 2025. As announced in our deprecation notice, support for Node.js 18 was dropped in version 2.79.0.
>
> If you must use Node.js 18, please use version 2.78.0, which is the last version that supported Node.js 18.

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We support Deno versions that are currently receiving active development and security updates. We follow the official Deno release schedule and only support versions from the stable and lts release channels.

When a Deno version reaches end-of-life and is no longer receiving security updates, Supabase will drop it in a minor release, and this won't be considered a breaking change.

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All modern browsers are supported. We support browsers that provide native fetch API. For Realtime features, browsers must also support native WebSocket API.

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We support Bun runtime environments. Bun provides native fetch support and is compatible with Node.js APIs. Since Bun does not follow a structured release schedule like Node.js or Deno, we support current stable versions of Bun and may drop support for older versions in minor releases without considering it a breaking change.

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We support React Native environments with fetch polyfills provided by the framework. Since React Native does not follow a structured release schedule, we support current stable versions and may drop support for older versions in minor releases without considering it a breaking change.

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We support Cloudflare Workers runtime environments. Cloudflare Workers provides native fetch support. Since Cloudflare Workers does not follow a structured release schedule, we support current stable versions and may drop support for older versions in minor releases without considering it a breaking change.

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- Experimental features: Features marked as experimental may be removed or changed without notice

Contributing

We welcome contributions! Please see our Contributing Guide for details on how to get started.

For major changes or if you're unsure about something, please open an issue first to discuss your proposed changes.

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`bash


From the monorepo root

npx nx build supabase-js

Or with watch mode for development

npx nx build supabase-js --watch
`

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There's a complete guide on how to set up your environment for running locally the supabase-js` integration tests. Please refer to TESTING.md.

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