@supabase/functions-js

Supabase Functions JS SDK

JavaScript SDK to interact with Supabase Edge Functions.

Guides · Reference Docs · TypeDoc

Requirements

• Node.js 22 or later (Node.js 20 support dropped in v2.110.0)
• For browser support, all modern browsers are supported

⚠️ 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 on October 31, 2025.

⚠️ Node.js 20 Deprecation Notice

Node.js 20 reached end-of-life on April 30, 2026. As announced in our deprecation notice, support for Node.js 20 was dropped in v2.110.0.

Quick Start

Installation

npm install @supabase/functions-js

Usage

import { FunctionsClient } from '@supabase/functions-js'

const functionsUrl = 'https://<project_ref>.supabase.co/functions/v1'
const publishableKey = '<publishable_key>'

const functions = new FunctionsClient(functionsUrl, {
  headers: {
    Authorization: `Bearer ${publishableKey}`,
  },
})

// Invoke a function
const { data, error } = await functions.invoke('hello-world', {
  body: { name: 'Functions' },
})

Development

This package is part of the Supabase JavaScript monorepo. To work on this package:

Building

# Complete build (from monorepo root)
pnpm nx build functions-js

# Build with watch mode for development
pnpm nx build functions-js --watch

# Individual build targets
pnpm nx build:main functions-js    # CommonJS build (dist/main/)
pnpm nx build:module functions-js  # ES Modules build (dist/module/)

# Other useful commands
pnpm nx clean functions-js         # Clean build artifacts
pnpm nx typecheck functions-js     # TypeScript type checking
pnpm nx docs functions-js          # Generate documentation

Build Outputs

• CommonJS (dist/main/) - For Node.js environments
• ES Modules (dist/module/) - For modern bundlers (Webpack, Vite, Rollup)
• TypeScript definitions (dist/module/index.d.ts) - Type definitions for TypeScript projects

Testing

Docker Required for relay tests. The functions-js tests use testcontainers to spin up a Deno relay server for testing Edge Function invocations.

# Run all tests (from monorepo root)
pnpm nx test functions-js

# Run tests with coverage report
pnpm nx test functions-js --coverage

# Run tests in watch mode during development
pnpm nx test functions-js --watch

# CI test command (runs with coverage)
pnpm nx test:ci functions-js

Test Requirements

• Node.js 22+ - Required for testcontainers
• Docker - Must be installed and running for relay tests
• No Supabase instance needed - Tests use mocked services and testcontainers

What Gets Tested

• Function invocation - Testing the invoke() method with various options
• Relay functionality - Using a containerized Deno relay to test real Edge Function scenarios
• Error handling - Ensuring proper error responses and retries
• Request/response models - Validating headers, body, and response formats

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.

Similar packages

Other packages similar to @supabase/functions-js

firebase

Firebase's JavaScript SDK includes Cloud Functions clients for calling callable functions. Like Supabase's client, it lets application code invoke deployed functions; it is designed for Firebase's callable-function protocol and ecosystem rather than Supabase Edge Functions.

@aws-sdk/client-lambda

The AWS SDK package can invoke AWS Lambda functions through the AWS API. It serves a similar function of calling deployed serverless code, but uses AWS-specific credentials, configuration, and invocation semantics rather than making Supabase Edge Function requests.

axios

Axios is a general-purpose HTTP client that can send requests to function endpoints. It offers flexible request and response handling, but does not provide Supabase Edge Function-specific invocation behavior or integration.