Baileys – Typescript/Javascript WhatsApp Web API


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Baileys – Typescript/Javascript WhatsApp Web API
Baileys does not require Selenium or any other browser to be interface with WhatsApp Web, it does so directly using a WebSocket. Not running Selenium or Chromimum saves you like half a gig of ram :/
Thank you to @Sigalor for writing his observations on the workings of WhatsApp Web and thanks to @Rhymen for the go implementation.
Baileys is type-safe, extensible and simple to use. If you require more functionality than provided, it’ll super easy for you to write an extension. More on this here.
If you’re interested in building a WhatsApp bot, you may wanna check out WhatsAppInfoBot and an actual bot built with it, Messcat.
Read the docs here
Join the Discord here
Do check out & run example.ts to see example usage of the library.
The script covers most common use cases.
To run the example script, download or clone the repo and then type the following in terminal:
cd path/to/Baileys
npm install
npm run example
Create and cd to your NPM project directory and then in terminal, write:
stable: npm install @adiwajshing/baileys
stabl-ish w quicker fixes & latest features: npm install github:adiwajshing/baileys
Do note, the library will likely vary if you’re using the NPM package, read that here
Then import in your code using:
import { WAConnection } from ‘@adiwajshing/baileys’
Unit Tests
Baileys also comes with a unit test suite. Simply cd into the Baileys directory & run npm test.
You will require a phone with WhatsApp to test, and a second WhatsApp number to send messages to.
Set the phone number you can randomly send messages to in a .env file with [email protected]
import { WAConnection } from ‘@adiwajshing/baileys’

async function connectToWhatsApp () {
const conn = new WAConnection()
// called when WA sends chats
// this can take up to a few minutes if you have thousands of chats!
conn.on(‘chats-received’, async ({ hasNewChats }) => {
console.log(`you have ${conn.chats.length} chats, new chats available: ${hasNewChats}`)

const unread = await conn.loadAllUnreadMessages ()
console.log (“you have ” + unread.length + ” unread messages”)
// called when WA sends chats
// this can take up to a few minutes if you have thousands of contacts!
conn.on(‘contacts-received’, () => {
console.log(‘you have ‘ + Object.keys(conn.contacts).length + ‘ contacts’)

await conn.connect ()
conn.on(‘chat-update’, chatUpdate => {
// `chatUpdate` is a partial object, containing the updated properties of the chat
// received a new message
if (chatUpdate.messages && chatUpdate.count) {
const message = chatUpdate.messages.all()[0]
console.log (message)
} else console.log (chatUpdate) // see updates (can be archived, pinned etc.)
// run in main file
connectToWhatsApp ()
.catch (err => console.log(“unexpected error: ” + err) ) // catch any errors
If the connection is successful, you will see a QR code printed on your terminal screen, scan it with WhatsApp on your phone and you’ll be logged in!
Do note, the conn.chats object is a KeyedDB. This is done for the following reasons:
Most applications require chats to be ordered in descending order of time. (KeyedDB does this in log(N) time)
Most applications require pagination of chats (Use chats.paginated())
Most applications require O(1) access to chats via the chat ID. (Use chats.get(jid) with KeyedDB)
Configuring the Connection
You can configure the connection via the connectOptions property. You can even specify an HTTPS proxy. For example:
import { WAConnection, ProxyAgent } from ‘@adiwajshing/baileys’

const conn = new WAConnecion ()
conn.connectOptions.agent = ProxyAgent (‘http://some-host:1234’)

await conn.connect ()
console.log (“oh hello ” + + “! You connected via a proxy”)
The entire WAConnectOptions struct is mentioned here with default values:
conn.connectOptions = {
/** fails the connection if no data is received for X seconds */
maxIdleTimeMs?: 60_000,
/** maximum attempts to connect */
maxRetries?: 10,
/** max time for the phone to respond to a connectivity test */
phoneResponseTime?: 15_000,
/** minimum time between new connections */
connectCooldownMs?: 4000,
/** agent used for WS connections (could be a proxy agent) */
agent?: Agent = undefined,
/** agent used for fetch requests — uploading/downloading media */
fetchAgent?: Agent = undefined,
/** always uses takeover for connecting */
alwaysUseTakeover: true
} as WAConnectOptions
Saving & Restoring Sessions
You obviously don’t want to keep scanning the QR code every time you want to connect.
So, you can save the credentials to log back in via:
import * as fs from ‘fs’

const conn = new WAConnection()
// this will be called as soon as the credentials are updated
conn.on (‘open’, () => {
// save credentials whenever updated
console.log (`credentials updated!`)
const authInfo = conn.base64EncodedAuthInfo() // get all the auth info we need to restore this session
fs.writeFileSync(‘./auth_info.json’, JSON.stringify(authInfo, null, ‘t’)) // save this info to a file
await conn.connect() // connect
Then, to restore a session:
const conn = new WAConnection()
conn.loadAuthInfo (‘./auth_info.json’) // will load JSON credentials from file
await conn.connect()
// yay connected without scanning QR
Optionally, you can load the credentials yourself from somewhere
& pass in the JSON object to loadAuthInfo () as well.
If you’re considering switching from a Chromium/Puppeteer based library, you can use WhatsApp Web’s Browser credentials to restore sessions too:
conn.loadAuthInfo (‘./auth_info_browser.json’)
await conn.connect() // works the same
See the browser credentials type in the docs.
Note: Upon every successive connection, WA can update part of the stored credentials. Whenever that happens, the credentials are uploaded, and you should probably update your saved credentials upon receiving the open event. Not doing so may lead WA to log you out after a few weeks with a 419 error code.
QR Callback
If you want to do some custom processing with the QR code used to authenticate, you can register for the following event:
conn.on(‘qr’, qr => {
// Now, use the ‘qr’ string to display in QR UI or send somewhere
await conn.connect ()
Handling Events
Baileys now uses the EventEmitter syntax for events.
They’re all nicely typed up, so you shouldn’t have any issues with an Intellisense editor like VS Code.
Also, these events are fired regardless of whether they are initiated by the Baileys client or are relayed from your phone.
/** when the connection has opened successfully */
on (event: ‘open’, listener: (result: WAOpenResult) => void): this
/** when the connection is opening */
on (event: ‘connecting’, listener: () => void): this
/** when the connection has closed */
on (event: ‘close’, listener: (err: {reason?: DisconnectReason | string, isReconnecting: boolean}) => void): this
/** when the socket is closed */
on (event: ‘ws-close’, listener: (err: {reason?: DisconnectReason | string}) => void): this
/** when a new QR is generated, ready for scanning */
on (event: ‘qr’, listener: (qr: string) => void): this
/** when the connection to the phone changes */
on (event: ‘connection-phone-change’, listener: (state: {connected: boolean}) => void): this
/** when a contact is updated */
on (event: ‘contact-update’, listener: (update: WAContactUpdate) => void): this
/** when a new chat is added */
on (event: ‘chat-new’, listener: (chat: WAChat) => void): this
/** when contacts are sent by WA */
on (event: ‘contacts-received’, listener: (u: { updatedContacts: Partial[] }) => void): this
/** when chats are sent by WA, and when all messages are received */
on (event: ‘chats-received’, listener: (update: {hasNewChats?: boolean}) => void): this
/** when all initial messages are received from WA */
on (event: ‘initial-data-received’, listener: (update: {chatsWithMissingMessages: { jid: string, count: number }[] }) => void): this
/** when multiple chats are updated (new message, updated message, deleted, pinned, etc) */
on (event: ‘chats-update’, listener: (chats: WAChatUpdate[]) => void): this
/** when a chat is updated (new message, updated message, read message, deleted, pinned, presence updated etc) */
on (event: ‘chat-update’, listener: (chat: WAChatUpdate) => void): this
/** when participants are added to a group */
on (event: ‘group-participants-update’, listener: (update: {jid: string, participants: string[], actor?: string, action: WAParticipantAction}) => void): this
/** when the group is updated */
on (event: ‘group-update’, listener: (update: Partial & {jid: string, actor?: string}) => void): this
/** when WA sends back a pong */
on (event: ‘received-pong’, listener: () => void): this
/** when a user is blocked or unblockd */
on (event: ‘blocklist-update’, listener: (update: BlocklistUpdate) => void): this
Sending Messages
Send all types of messages with a single function:
Non-Media Messages
import { MessageType, MessageOptions, Mimetype } from ‘@adiwajshing/baileys’

const id = ‘[email protected]’ // the WhatsApp ID
// send a simple text!
const sentMsg = await conn.sendMessage (id, ‘oh hello there’, MessageType.text)
// send a location!
const sentMsg = await conn.sendMessage(id, {degreesLatitude: 24.121231, degreesLongitude: 55.1121221}, MessageType.location)
// send a contact!
const vcard = ‘BEGIN:VCARDn’ // metadata of the contact card
+ ‘VERSION:3.0n’
+ ‘FN:Jeff Singhn’ // full name
+ ‘ORG:Ashoka Uni;n’ // the organization of the contact
+ ‘TEL;type=CELL;type=VOICE;waid=911234567890:+91 12345 67890n’ // WhatsApp ID + phone number
const sentMsg = await conn.sendMessage(id, {displayname: “Jeff”, vcard: vcard},
Media Messages
Sending media (video, stickers, images) is easier & more efficient than ever.
You can specify a buffer, a local url or even a remote url.
When specifying a media url, Baileys never loads the entire buffer into memory, it even encrypts the media as a readable stream.
import { MessageType, MessageOptions, Mimetype } from ‘@adiwajshing/baileys’
// Sending gifs
await conn.sendMessage(
fs.readFileSync(“Media/ma_gif.mp4”), // load a gif and send it,
{ mimetype: Mimetype.gif, caption: “hello!” }
await conn.sendMessage(
{ url: ‘Media/ma_gif.mp4’ }, // send directly from local file,
{ mimetype: Mimetype.gif, caption: “hello!” }

await conn.sendMessage(
{ url: ‘’ }, // send directly from remote url!,
{ mimetype: Mimetype.gif, caption: “hello!” }

// send an audio file
await conn.sendMessage(
{ url: “Media/audio.mp3” }, // can send mp3, mp4, & ogg,
{ mimetype: Mimetype.mp4Audio } // some metadata (can’t have caption in audio)
id is the WhatsApp ID of the person or group you’re sending the message to.
It must be in the format [country code][phone number], for example [email protected] for people. For groups, it must be in the format [email protected].
For broadcast lists it’s [timestamp of creation]@broadcast.
For stories, the ID is status@broadcast.

For media messages, the thumbnail can be generated automatically for images & stickers. Thumbnails for videos can also be generated automatically, though, you need to have ffmpeg installed on your system.
MessageOptions: some extra info about the message. It can have the following optional values:
const info: MessageOptions = {
quoted: quotedMessage, // the message you want to quote
contextInfo: { forwardingScore: 2, isForwarded: true }, // some random context info (can show a forwarded message with this too)
timestamp: Date(), // optional, if you want to manually set the timestamp of the message
caption: “hello there!”, // (for media messages) the caption to send with the media (cannot be sent with stickers though)
thumbnail: “23GD#4/==”, /* (for location & media messages) has to be a base 64 encoded JPEG if you want to send a custom thumb,
or set to null if you don’t want to send a thumbnail.
Do not enter this field if you want to automatically generate a thumb
mimetype: Mimetype.pdf, /* (for media messages) specify the type of media (optional for all media types except documents),
import {Mimetype} from ‘@adiwajshing/baileys’
filename: ‘somefile.pdf’, // (for media messages) file name for the media
/* will send audio messages as voice notes, if set to true */
ptt: true,
// will detect links & generate a link preview automatically (default true)
detectLinks: true,
/** Should it send as a disappearing messages.
* By default ‘chat’ — which follows the setting of the chat */
sendEphemeral: ‘chat’

Forwarding Messages
const messages = await conn.loadConversation (‘[email protected]’, 1)
const message = messages[0] // get the last message from this conversation
await conn.forwardMessage (‘[email protected]’, message) // WA forward the message!
Reading Messages
const id = ‘[email protected]
const messageID = ‘AHASHH123123AHGA’ // id of the message you want to read

await conn.chatRead (id) // mark all messages in chat as read (equivalent of opening a chat in WA)
await conn.chatRead (id, ‘unread’) // mark the chat as unread
The message ID is the unique identifier of the message that you are marking as read. On a WAMessage, the messageID can be accessed using messageID =
Update Presence
import { Presence } from ‘@adiwajshing/baileys’
await conn.updatePresence(id, Presence.available)
This lets the person/group with id know whether you’re online, offline, typing etc. where presence can be one of the following:
export enum Presence {
available = ‘available’, // “online”
composing = ‘composing’, // “typing…”
recording = ‘recording’, // “recording…”
paused = ‘paused’ // stopped typing, back to “online”
The presence expires after about 10 seconds.
Downloading Media Messages
If you want to save the media you received
import { MessageType } from ‘@adiwajshing/baileys’
conn.on (‘message-new’, async m => {
if (!m.message) return // if there is no text or media message
const messageType = Object.keys (m.message)[0]// get what type of message it is — text, image, video
// if the message is not a text message
if (messageType !== MessageType.text && messageType !== MessageType.extendedText) {
const buffer = await conn.downloadMediaMessage(m) // to decrypt & use as a buffer

const savedFilename = await conn.downloadAndSaveMediaMessage (m) // to decrypt & save to file
console.log(m.key.remoteJid + ” sent media, saved at: ” + savedFilename)
Deleting Messages
const jid = ‘[email protected]’ // can also be a group
const response = await conn.sendMessage (jid, ‘hello!’, MessageType.text) // send a message

await conn.deleteMessage (jid, {id: response.messageID, remoteJid: jid, fromMe: true}) // will delete the sent message for everyone!
await conn.clearMessage (jid, {id: response.messageID, remoteJid: jid, fromMe: true}) // will delete the sent message for only you!
Modifying Chats
const jid = ‘[email protected]’ // can also be a group
await conn.modifyChat (jid, ChatModification.archive) // archive chat
await conn.modifyChat (jid, ChatModification.unarchive) // unarchive chat

const response = await conn.modifyChat (jid, // pin the chat
await conn.modifyChat (jid, ChatModification.unpin) // unpin it

await conn.modifyChat (jid, ChatModification.mute, 8*60*60*1000) // mute for 8 hours
setTimeout (() => {
conn.modifyChat (jid, ChatModification.unmute)
}, 5000) // unmute after 5 seconds

await conn.modifyChat (jid, ChatModification.delete) // will delete the chat (can be a group or broadcast list as well)
Note: to unmute or unpin a chat, one must pass the timestamp of the pinning or muting. This is returned by the pin & mute functions. This is also available in the WAChat objects of the respective chats, as a mute or pin property.
Disappearing Messages
const jid = ‘[email protected]’ // can also be a group
// turn on disappearing messages
await conn.toggleDisappearingMessages(
WA_DEFAULT_EPHEMERAL // this is 1 week in seconds — how long you want messages to appear for
// will automatically send as a disappearing message
await conn.sendMessage(jid, ‘Hello poof!’, MessageType.text)
// turn off disappearing messages
await conn.toggleDisappearingMessages(jid, 0)
To load chats in a paginated manner
const {chats, cursor} = await conn.loadChats (25)
if (cursor) {
const moreChats = await conn.loadChats (25, cursor) // load the next 25 chats

To check if a given ID is on WhatsApp
Note: this method falls back to using to determine whether a number is on WhatsApp in case the WebSocket connection is not open yet.
const id = ‘123456’
const exists = await conn.isOnWhatsApp (id)
if (exists) console.log (`${id} exists on WhatsApp, as jid: ${exists.jid}`)

To query chat history on a group or with someone
// query the last 25 messages (replace 25 with the number of messages you want to query)
const messages = await conn.loadMessages (“[email protected]”, 25)
console.log(“got back ” + messages.length + ” messages”)
You can also load the entire conversation history if you want
await conn.loadAllMessages (“[email protected]”, message => console.log(“Loaded message with ID: ” +
console.log(“queried all messages”) // promise resolves once all messages are retrieved

To get the status of some person
const status = await conn.getStatus (“[email protected]”) // leave empty to get your own status
console.log(“status: ” + status)

To get the display picture of some person/group
const ppUrl = await conn.getProfilePicture (“[email protected]”) // leave empty to get your own
console.log(“download profile picture from: ” + ppUrl)

To change your display picture or a group’s
const jid = ‘[email protected]’ // can be your own too
const img = fs.readFileSync (‘new-profile-picture.jpeg’) // can be PNG also
await conn.updateProfilePicture (jid, img)

To get someone’s presence (if they’re typing, online)
// the presence update is fetched and called here
conn.on (‘CB:Presence’, json => console.log( + ” presence is ” + json.type))
await conn.requestPresenceUpdate (“[email protected]”) // request the update

To search through messages
const response = await conn.searchMessages (‘so cool’, null, 25, 1) // search in all chats
console.log (`got ${response.messages.length} messages in search`)

const response2 = await conn.searchMessages (‘so cool’, ‘[email protected]’, 25, 1) // search in given chat

To block or unblock user
await conn.blockUser (“[email protected]”, “add”) // Block user
await conn.blockUser (“[email protected]”, “remove”) // Unblock user

Of course, replace xyz with an actual ID.
To create a group
// title & participants
const group = await conn.groupCreate (“My Fab Group”, [“[email protected]”, “[email protected]”])
console.log (“created group with id: ” + group.gid)
conn.sendMessage(group.gid, “hello everyone”, MessageType.extendedText) // say hello to everyone on the group

To add people to a group
// id & people to add to the group (will throw error if it fails)
const response = await conn.groupAdd (“[email protected]”, [“[email protected]”, “[email protected]”])

To make/demote admins on a group
// id & people to make admin (will throw error if it fails)
await conn.groupMakeAdmin (“[email protected]”, [“[email protected]”, “[email protected]”])
await conn.groupDemoteAdmin (“[email protected]”, [“[email protected]”, “[email protected]”]) // demote admins

To change the group’s subject
await conn.groupUpdateSubject(“[email protected]”, “New Subject!”)

To change the group’s description
await conn.groupUpdateDescription(“[email protected]”, “This group has a new description”)

To change group settings
import { GroupSettingChange } from ‘@adiwajshing/baileys’
// only allow admins to send messages
await conn.groupSettingChange (“[email protected]”, GroupSettingChange.messageSend, true)
// allow everyone to modify the group’s settings — like display picture etc.
await conn.groupSettingChange (“[email protected]”, GroupSettingChange.settingChange, false)
// only allow admins to modify the group’s settings
await conn.groupSettingChange (“[email protected]”, GroupSettingChange.settingChange, true)

To leave a group
await conn.groupLeave (“[email protected]”) // (will throw error if it fails)

To get the invite code for a group
const code = await conn.groupInviteCode (“[email protected]”)
console.log(“group code: ” + code)

To query the metadata of a group
const metadata = await conn.groupMetadata (“[email protected]”)
console.log( + “, title: ” + json.subject + “, description: ” + json.desc)

// Or if you’ve left the group — call this
const metadata2 = await conn.groupMetadataMinimal (“[email protected]”)

To join the group using the invitation code
const response = await conn.acceptInvite (“xxx”)
console.log(“joined to: ” + response.gid)
Of course, replace xxx with invitation code.
To revokes the current invite link of a group
const response = await conn.revokeInvite (“[email protected]”)
console.log(“new group code: ” + response.code)

Broadcast Lists & Stories
You can send messages to broadcast lists the same way you send messages to groups & individual chats.
Unfortunately, WA Web does not support creating broadcast lists right now but you can still delete them.
Broadcast IDs are in the format 12345678@broadcast
To query a broadcast list’s recipients & name:
const bList = await conn.getBroadcastListInfo (“1234@broadcast”)
console.log (`list name: ${}, recps: ${bList.recipients}`)

Writing Custom Functionality
Baileys is written, keeping in mind, that you may require other custom functionality. Hence, instead of having to fork the project & re-write the internals, you can simply write extensions in your own code.
First, enable the logging of unhandled messages from WhatsApp by setting
conn.logger.level = ‘debug’
This will enable you to see all sorts of messages WhatsApp sends in the console. Some examples:

Functionality to track of the battery percentage of your phone.
You enable logging and you’ll see a message about your battery pop up in the console:
s22, [“action”,null,[[“battery”,{“live”:”false”,”value”:”52″},null]]]
You now know what a battery update looks like. It’ll have the following characteristics.
Given const bMessage = [“action”,null,[[“battery”,{“live”:”false”,”value”:”52″},null]]]
bMessage[0] is always “action”
bMessage[1] is always null
bMessage[2][0][0] is always “battery”
Hence, you can register a callback for an event using the following:
conn.on (`CB:action,,battery`, json => {
const batteryLevelStr = json[2][0][1].value
const batterylevel = parseInt (batteryLevelStr)
console.log (“battery level: ” + batterylevel + “%”)
This callback will be fired any time a message is received matching the following criteria:
message [0] === “action” && message [1] === null && message[2][0][0] === “battery”

Functionality to keep track of the pushname changes on your phone.
You enable logging and you’ll see an unhandled message about your pushanme pop up like this:
s24, [“Conn”,{“pushname”:”adiwajshing”}]
You now know what a pushname update looks like. It’ll have the following characteristics.
Given const pMessage = [“Conn”,{“pushname”:”adiwajshing”}]
pMessage[0] is always “Conn”
pMessage[1] always has the key “pushname”
pMessage[2] is always undefined
Following this, one can implement the following callback:
conn.on (‘CB:Conn,pushname’, json => {
const pushname = json[1].pushname = pushname // update on client too
console.log (“Name updated: ” + pushname)
This callback will be fired any time a message is received matching the following criteria:
message [0] === “Conn” && message [1].pushname

A little more testing will reveal that almost all WhatsApp messages are in the format illustrated above.
Note: except for the first parameter (in the above cases, “action” or “Conn”), all the other parameters are optional.
This library was originally a project for CS-2362 at Ashoka University and is in no way affiliated with WhatsApp. Use at your own discretion. Do not spam people with this.

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