Functions

Browserbase Functions Skill

Guide Claude through deploying serverless browser automation using the official bb CLI.

When to Use

Use this skill when:

Prerequisites

1. Get Credentials

Get API key and Project ID from: https://browserbase.com/settings

2. Set Environment Variables

Set directly:

export BROWSERBASE_API_KEY="your_api_key"
export BROWSERBASE_PROJECT_ID="your_project_id"

Creating a Function Project

1. Initialize with Official CLI

pnpm dlx @browserbasehq/sdk-functions init my-function
cd my-function

This creates:

my-function/
├── package.json
├── index.ts        # Your function code
└── .env            # Add credentials here

2. Add Credentials to .env

# Copy from stored credentials
echo "BROWSERBASE_API_KEY=$BROWSERBASE_API_KEY" >> .env
echo "BROWSERBASE_PROJECT_ID=$BROWSERBASE_PROJECT_ID" >> .env

Or manually edit .env:

BROWSERBASE_API_KEY=your_api_key
BROWSERBASE_PROJECT_ID=your_project_id

3. Install Dependencies

pnpm install

Function Structure

import { defineFn } from "@browserbasehq/sdk-functions";
import { chromium } from "playwright-core";
defineFn("my-function", async (context) => {
  const { session, params } = context;
  
  // Connect to browser
  const browser = await chromium.connectOverCDP(session.connectUrl);
  const page = browser.contexts()[0]!.pages()[0]!;
  
  // Your automation
  await page.goto(params.url || "https://example.com");
  const title = await page.title();
  
  // Return JSON-serializable result
  return { success: true, title };
});

Key objects:

Development Workflow

1. Start Dev Server

pnpm bb dev index.ts

Server runs at http://127.0.0.1:14113

2. Test Locally

curl -X POST http://127.0.0.1:14113/v1/functions/my-function/invoke \
  -H "Content-Type: application/json" \
  -d '{"params": {"url": "https://news.ycombinator.com"}}'

3. Iterate

The dev server auto-reloads on file changes. Use console.log() for debugging - output appears in the terminal.

Deploying

Publish to Browserbase

pnpm bb publish index.ts

Output:

Function published successfully
Build ID: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
Function ID: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

Save the Function ID - you need it to invoke.

Invoking Deployed Functions

Via curl

# Start invocation
curl -X POST "https://api.browserbase.com/v1/functions/FUNCTION_ID/invoke" \
  -H "Content-Type: application/json" \
  -H "x-bb-api-key: $BROWSERBASE_API_KEY" \
  -d '{"params": {"url": "https://example.com"}}'
Response: {"id": "INVOCATION_ID"}
Poll for result
curl "https://api.browserbase.com/v1/functions/invocations/INVOCATION_ID" \
  -H "x-bb-api-key: $BROWSERBASE_API_KEY"

Via Code

async function invokeFunction(functionId: string, params: object) {
  // Start invocation
  const invokeRes = await fetch(
    https://api.browserbase.com/v1/functions/${functionId}/invoke,
    {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'x-bb-api-key': process.env.BROWSERBASE_API_KEY!,
      },
      body: JSON.stringify({ params }),
    }
  );
  const { id: invocationId } = await invokeRes.json();
  // Poll until complete
  while (true) {
    await new Promise(r => setTimeout(r, 5000));
    
    const statusRes = await fetch(
      https://api.browserbase.com/v1/functions/invocations/${invocationId},
      { headers: { 'x-bb-api-key': process.env.BROWSERBASE_API_KEY! } }
    );
    const result = await statusRes.json();
    
    if (result.status === 'COMPLETED') return result.results;
    if (result.status === 'FAILED') throw new Error(result.error);
  }
}

Common Patterns

Parameterized Scraping

defineFn("scrape", async ({ session, params }) => {
  const browser = await chromium.connectOverCDP(session.connectUrl);
  const page = browser.contexts()[0]!.pages()[0]!;
  
  await page.goto(params.url);
  await page.waitForSelector(params.selector);
  
  const items = await page.$$eval(params.selector, els => 
    els.map(el => el.textContent?.trim())
  );
  
  return { url: params.url, items };
});

With Authentication

defineFn("authenticated-action", async ({ session, params }) => {
  const browser = await chromium.connectOverCDP(session.connectUrl);
  const page = browser.contexts()[0]!.pages()[0]!;
  
  // Login
  await page.goto("https://example.com/login");
  await page.fill('[name="email"]', params.email);
  await page.fill('[name="password"]', params.password);
  await page.click('button[type="submit"]');
  await page.waitForURL('**/dashboard');
  
  // Do authenticated work
  const data = await page.textContent('.user-data');
  return { data };
});

Error Handling

defineFn("safe-scrape", async ({ session, params }) => {
  const browser = await chromium.connectOverCDP(session.connectUrl);
  const page = browser.contexts()[0]!.pages()[0]!;
  
  try {
    await page.goto(params.url, { timeout: 30000 });
    await page.waitForSelector(params.selector, { timeout: 10000 });
    
    const data = await page.textContent(params.selector);
    return { success: true, data };
  } catch (error) {
    return { 
      success: false, 
      error: error instanceof Error ? error.message : 'Unknown error' 
    };
  }
});

CLI Reference

| Command | Description | |---------|-------------| | pnpm dlx @browserbasehq/sdk-functions init | Create new project | | pnpm bb dev | Start local dev server | | pnpm bb publish | Deploy to Browserbase |

Troubleshooting

"Missing API key"

# Check .env file has credentials
cat .env
Or set for current shell
export BROWSERBASE_API_KEY="your_key"
export BROWSERBASE_PROJECT_ID="your_project"

Dev server won't start

# Make sure SDK is installed
pnpm add @browserbasehq/sdk-functions
Or use npx
npx @browserbasehq/sdk-functions dev index.ts

Function times out

Can't connect to browser

1. Get Credentials

Get API key and Project ID from: https://browserbase.com/settings

2. Set Environment Variables

Set directly:

export BROWSERBASE_API_KEY="your_api_key"
export BROWSERBASE_PROJECT_ID="your_project_id"

"Missing API key"

# Check .env file has credentials
cat .env
Or set for current shell
export BROWSERBASE_API_KEY="your_key"
export BROWSERBASE_PROJECT_ID="your_project"

Dev server won't start

# Make sure SDK is installed
pnpm add @browserbasehq/sdk-functions
Or use npx
npx @browserbasehq/sdk-functions dev index.ts

Function times out

Can't connect to browser