stripe

Stripe API Emulator

Fully stateful Stripe API emulation. Customers, products, prices, checkout sessions, payment intents, charges, and payment methods persist in memory. Webhooks fire on state changes. The hosted checkout UI lets you complete payments in the browser.

No real payments are processed. Every Stripe SDK call hits the emulator and produces realistic responses.

Start

# Stripe only
npx emulate --service stripe

# Default port (when run alone)
# http://localhost:4000

Or programmatically:

import { createEmulator } from 'emulate'

const stripe = await createEmulator({ service: 'stripe', port: 4000 })
// stripe.url === 'http://localhost:4000'

Pointing Your App at the Emulator

Stripe SDK

The Stripe Node.js SDK does not read an environment variable for the base URL. You must pass it when constructing the client:

import Stripe from 'stripe'

const stripe = new Stripe(process.env.STRIPE_SECRET_KEY!, {
  apiVersion: '2024-12-18.acacia',
  host: 'localhost',
  port: 4000,
  protocol: 'http',
})

Embedded in Next.js (adapter-next)

When using @emulators/adapter-next, the emulator runs inside your Next.js app at /emulate/stripe. The SDK needs to point at localhost with a proxy route to forward /v1/* calls to /emulate/stripe/v1/*:

// next.config.ts
import { withEmulate } from '@emulators/adapter-next'

export default withEmulate({
  env: {
    STRIPE_SECRET_KEY: 'sk_test_emulated',
  },
})

// lib/stripe.ts
import Stripe from 'stripe'

const port = process.env.PORT ?? '3000'

export const stripe = new Stripe(process.env.STRIPE_SECRET_KEY!, {
  apiVersion: '2024-12-18.acacia',
  host: 'localhost',
  port: parseInt(port, 10),
  protocol: 'http',
})

// app/emulate/[...path]/route.ts
import { createEmulateHandler } from '@emulators/adapter-next'
import * as stripe from '@emulators/stripe'

export const { GET, POST, PUT, PATCH, DELETE } = createEmulateHandler({
  services: {
    stripe: {
      emulator: stripe,
      seed: {
        products: [
          { id: 'prod_widget', name: 'Widget', description: 'A useful widget' },
        ],
        prices: [
          { id: 'price_widget', product_name: 'Widget', currency: 'usd', unit_amount: 1000 },
        ],
        webhooks: [
          {
            url: `http://localhost:${process.env.PORT ?? '3000'}/api/webhooks/stripe`,
            events: ['*'],
          },
        ],
      },
    },
  },
})