FFastify × Asyntai50 free messages

AI Chatbot for FastifyRegister one plugin. Every HTML page gets the chat.

Products, pricing, docs, support: your AI assistant answers your visitors in seconds from your own content. Install the free fastify-ai-chatbot plugin, register it with your widget ID, and the chat is on every HTML page.

Start for free See the setup

No credit cardFastify 4 and 5Free npm plugin

atelierlila.com/products/garance-linen-dress

Atelier Lila

Garance linen dress

$98.00

XSSML

Add to cart

Atelier LilaOnline

Hi! Any questions about this dress?

5 minto install and register the plugin

24/7answers, weekends included

0templates to edit

50free messages to get started

What it handles

The questions your customers ask every day

They come right before the purchase, often in the evening. Without a quick answer, the cart stays empty. The chatbot answers them with your store's own information.

When will it arrive?How do I return an item?Which size should I pick?Can I pay with Afterpay?Do you offer 2-day shipping?My promo code doesn't work

Where is my order?Do you ship to Canada?What fabric is it?Do you offer gift wrapping?When is it back in stock?Do you sell wholesale?

Features

Built for Fastify apps

Works with Fastify 4 and 5 on Node 18 or newer, for pages from route handlers, from templates and from static files.

It knows your whole catalog

Product pages, categories, terms of sale, shipping and returns pages. Add your PDFs (size guide, data sheets) for everything else.

Garance linen dress$98.00

Ondine shirt$68.00

Size chart.pdfRead by the AI

Live in 5 minutes

One npm package and one register call. No template to edit and no script tag to paste.

5min

Speaks your customer's language

A shopper from Mexico, Quebec or Germany gets an answer in their own language, automatically.

ENESFRDEPTIT

It captures contacts

Quotes, trade orders, complex questions: it asks for the email and saves it.

Claire B.Quote for 40 pieces

New

Desktop and mobile

The chat adapts to every screen and sits clear of your header, menus and footer.

See what's blocking the sale

Conversations show the topics that keep coming back. You know what to add to your product pages.

Shipping38%

Sizes26%

Returns17%

Only your content

The AI answers from your pages and documents. It doesn't make up prices, delivery times or promises, and it doesn't answer off-topic questions.

Can you write me a poem?I only answer questions about the Atelier Lila store. Can I help you choose a size?

In action

An assistant that knows your store

It answers from your product pages, suggests the right items and wears your brand's colors.

Answers drawn from your pages
Sizes, delivery times, returns: it uses your own information and makes nothing up.
It can suggest your products
It shows items from your catalog as cards, with the price and a link to the product.
It passes contacts to you
For a quote or a trade order, it collects the customer's email.

Try a color

Setup

Setup with the Fastify plugin

Asyntai has a free Fastify plugin on npm. You register it in your app, and the chat shows on every HTML page that your app sends. Four steps, five minutes.

Copy your widget ID

Sign in to Asyntai and open the Install page. Your widget ID is the data-asyntai-id value in the snippet. It starts with asyntai_.

Install the package

In your project folder, run npm install fastify-ai-chatbot.

Register the plugin

Register fastify-ai-chatbot with your widgetId, before your routes. If you use @fastify/compress, register the chatbot plugin before it.

Start the app, and you're live

Start your app and open any page. The chat bubble is in the corner and already answers your visitors.

A missing or wrong widget ID stops the app at startup, with a message that tells you how to fix it. You can also set the ASYNTAI_WIDGET_ID environment variable.

my-app server.js

server.jsregister

1 const fastify = require('fastify')(); 2 3 fastify.register(require('fastify-ai-chatbot'), {4 widgetId: 'YOUR_ID',5 });6 7 fastify.listen({ port: 3000 });

node server.js

Why Asyntai

What Fastify sites gain

Start free with 50 messages, then grow with your store.

See pricing Start for free

Fewer abandoned carts

A customer with a doubt right before paying gets an answer straight away. A question about shipping costs no longer makes them leave the store.

Fewer repetitive requests

Shipping, tracking, returns and sizes get an automatic answer from your own pages. You only handle the requests that really need you.

More sales, same traffic

You already pay to bring in visitors with Google Ads, Meta or marketplaces. The chatbot helps them find the right product and order.

FAQ

Frequently asked questions

Everything you need to know to add an AI chatbot to your Fastify store.

Do I need to edit my templates?

No. The plugin adds the chat to every HTML page that your app sends: pages from route handlers, from templates and from static files.

Which versions does it support?

The plugin works with Fastify 4 and 5, on Node 18 or newer. It works with CommonJS, ES modules and TypeScript.

Will it slow down my app?

No. The chat script loads asynchronously in the browser, after the page is shown. Your routes run as before.

Does it work with @fastify/compress?

Yes. Register the chatbot plugin before @fastify/compress, so that the plugin adds the chat before the page is compressed.

Can I keep it off my admin pages?

Yes. Give the shouldInject option a function that gets the request and the reply. Return false for the pages that must not show the chat.

Can I keep the widget ID out of my code?

Yes. Leave out widgetId and set the ASYNTAI_WIDGET_ID environment variable.

Does it answer visitors who speak another language?

Yes. The chatbot detects the visitor's language and replies in it, even if your Fastify site is only in English.

Can I use it on several sites?

Yes. Each site has its own setup and knowledge base. The Free plan covers 1 site, Starter 2, Standard 3 and Pro up to 20 sites.

Guide

How an AI chatbot helps Fastify apps

A fast app, real questions

Fastify is a fast web framework for Node.js. Teams use it for SaaS products, portals and websites. Their users still get stuck: how does this feature work, what does my plan include, who do I contact.

An AI chatbot answers them on the page. It reads your website, docs and FAQs, then replies in plain words, in the tone you choose. Users get an immediate answer, and your team gets fewer support emails.

Answering the questions that block an order

Most questions arrive just before the purchase: shipping times, returns if the size is wrong, 2-day shipping, paying in installments. If the shopper can't find the answer in a few seconds, they close the tab.

The chatbot answers from your shipping, returns and terms pages. It reminds them of your return window, the carriers you use and your free-shipping threshold. The shopper feels reassured and completes the order.

A salesperson who knows every product

In a store, a salesperson helps with the choice. Online, the shopper is alone with your product pages. The chatbot takes that role: it compares two models, explains the difference between materials, recommends a size or suggests a matching item from your catalog.

Because it only answers from your content, it never recommends products you don't sell and never makes up specs. The richer your product pages, the more precise the answers.

Useful insights for your next campaigns

Every conversation is saved and searchable. Over the weeks, you see which products interest people most, the objections that keep coming up and the information that is missing.

If many shoppers ask whether a product comes in another color, you know what to add to your catalog. If shipping costs keep coming up, you can show them more clearly. The chatbot becomes both a customer service tool and a source of insight to grow your store.

Ready to add an AI assistant to your Fastify app?

Start free with 50 messages and see how many questions your customers ask every day.

Start for free See pricing

Other platforms

Express.js Hono Next.js Remix React Vue.js Ember.js FastAPI Laravel