Baileys vs whatsapp-web.js
Baileys for anything that has to run in production at more than a session or two; whatsapp-web.js for the fastest path from an idea to a working bot on one number. The browser is the whole trade: it is what makes whatsapp-web.js easy to start with and expensive to scale.
Why these two get compared
Both are the JavaScript route to a WhatsApp bot, and both come up in the same search. They are built on opposite ideas: Baileys implements the protocol itself, whatsapp-web.js automates the WhatsApp Web client in a headless browser. That single difference decides memory per session, what breaks when WhatsApp changes something, and which features are reachable at all.
Side by side
| Dimension | Baileys | whatsapp-web.js |
|---|---|---|
| License | MIT.source, checked September 14, 2026 | Apache-2.0.source, checked September 16, 2026 |
| Engine and protocol | TypeScript library speaking the WhatsApp Web multi-device protocol over a WebSocket. No browser. | JavaScript library that drives WhatsApp Web in a headless Chromium through Puppeteer. |
| Hosting | Your own Node.js process. You hold the session state, keep the socket alive and reconnect it. | Your own Node.js process plus one headless browser per linked number. |
| Groups, Channels and status | Groups, communities, Channels (newsletters) and status posts are all in the socket API.source, checked September 14, 2026 | Groups (create, participants, invite codes) are in the client. Creating and posting to Channels is not.source, checked September 16, 2026 |
| Pricing | Free under MIT. The cost is the always-on process, the session storage and the upkeep.source, checked September 14, 2026 | Free under Apache-2.0. Hosting is the cost: a browser per session needs far more memory than a protocol client.source, checked September 16, 2026 |
| Maintenance cadence | 9 commits in the 90 days to 14 September 2026. Latest tag 7.0.0-rc14, a release candidate for around ten months. 337 open issues.source, checked September 14, 2026 | 3 commits in the 90 days to 16 September 2026. Latest release v1.34.7 (April 2026), with a v2.0.0-alpha.0 tag. 107 open issues.source, checked September 16, 2026 |
| Webhooks | None built in. Events arrive on an in-process emitter (sock.ev); HTTP delivery, retries and signing are yours to write. | None built in. Events arrive on client.on('message') and its siblings; HTTP delivery is yours to write. |
| SDKs and client code | It is the client: npm @whiskeysockets/baileys, with TypeScript types.source, checked September 14, 2026 | It is the client: npm whatsapp-web.js.source, checked September 16, 2026 |
Which one to pick
Pick Baileys when
You will run several linked numbers, you need Channels or community features, or you cannot afford a headless browser per session in memory or in patching surface.
Pick whatsapp-web.js when
You want the quickest working prototype on one number, your team already knows Puppeteer, and a browser in the deployment is acceptable.
Where Wapito fits
Against a library, Wapito is the hosted version of the same idea: the session, the storage, the reconnects and the engine upgrades are ours, and you keep a REST contract you can generate a client from.
Frequently asked questions
Why does the browser matter so much?
A headless Chromium carries hundreds of megabytes of memory per session and a large surface to keep patched, and scaling means one browser per linked number. A protocol client holds a WebSocket instead, so one modest server runs many sessions. The browser is also why an upstream change to the web client's markup can break whatsapp-web.js overnight, while a protocol client breaks only when the protocol itself changes.
Are the chat and contact identifiers compatible between the two?
The concepts are the same, but the string formats differ between clients, so store ids as strings and treat a migration as a mapping exercise rather than a rewrite. A hosted API that accepts several input forms and normalises its output to one removes that mapping entirely, which is one reason teams moving off either library often move to a REST API rather than to the other library.
Which one gets more maintenance?
Neither is idle, but the shapes differ. Baileys had nine commits in the ninety days to mid-September 2026 and a major version that has sat on release candidates for months; whatsapp-web.js had three commits in the same window, a stable release from April 2026, and an alpha tag for its next major. Check the repositories before you commit, because both numbers move.
Related
Read more about each
Feature guides
Other comparisons
Try it on your own number
Create a channel, link a WhatsApp number by QR or pairing code, and call the API in a couple of minutes. The Sandbox plan is free and needs no card.