Install

npm i lemonsqueezy-webhooks

Usage

This package exposes the lemon-squeezy webhooks types and an utility functions to handle webhooks in Node.js

nodejsWebHookHandler

Checks the signature of the request body and parses it to a WebhookPayload type.

It also adds a top level event_name field to make Typescript discriminated unions work inside onData.

Usage in Node.js

import { nodejsWebHookHandler } from 'lemonsqueezy-webhooks'

const secret = process.env.LEMON_SQUEEZY_WEBHOOK_SECRET

// ... Express app setup

app.post('/webhooks', async (req, res) => {
    await nodejsWebHookHandler({
        async onData(payload) {
            console.log(payload)
            // payload.event_name allows TypeScript to infer the type of payload.data
            if (payload.event_name === 'order_created') {
                // payload.data is an Order
                console.log(payload.data.attributes.status)
            }
        },
        req,
        res,
        secret,
    })
})

Usage in Next.js (with Node runtime)

You can also see the source code in the Next.js app example in this repo for a full example.

// api/webhook.ts
import type { NextApiResponse, NextApiRequest } from 'next'
import { nodejsWebHookHandler } from 'lemonsqueezy-webhooks'

export const config = {
    api: {
        // important! otherwise the body signature check will fail
        bodyParser: false,
    },
}

const secret = process.env.SECRET

if (!secret) {
    throw new Error('SECRET is not set')
}

export default async function handler(
    req: NextApiRequest,
    res: NextApiResponse,
) {
    await nodejsWebHookHandler({
        async onData(payload) {
            console.log(payload)
            if (payload.event_name === 'order_created') {
                // payload.data is an Order
                console.log(payload.data.attributes.status)
            }
        },
        req,
        res,
        secret,
    })
}

Usage in Next.js (with Web Streams)

You can also use the whatwgWebhooksHandler function to handle webhooks in Next.js routes that export a POST and GET handler.

// api/webhook.ts

import { whatwgWebhooksHandler } from 'lemonsqueezy-webhooks'

const secret = process.env.SECRET

if (!secret) {
    throw new Error('SECRET is not set')
}

export const POST = (request: Request) => {
    return whatwgWebhooksHandler({
        async onData(payload) {
            console.log(payload)
            if (payload.event_name === 'order_created') {
                // payload.data is an Order
                console.log(payload.data.attributes.status)
            }
        },
        request,
        secret,
    })
}

Exported types:

• WebhookPayload, the lemonsqueezy json body of a webhook
• Order, the payload.data type for the events
  • order_created
  • order_updated
  • order_deleted
• Subscription, the payload.data type for the events
  • subscription_created
  • subscription_cancelled
  • subscription_resumed
  • subscription_expired
  • subscription_paused
  • subscription_unpaused
• SubscriptionInvoice, the payload.data type for the events
  • subscription_payment_success
  • subscription_payment_failed
  • subscription_payment_recovered
• LicenseKey, the payload.data type for the events
  • license_key_created

Exported functions

• nodejsWebHookHandler, it handles webhooks signature check and parsing. It also adds a top level event_name field to the payload to make Typescript discriminated unions work and infer the payload.data type under if blocks inside onData.

Sponsors

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Licensed under MIT.