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The Contacts trait provides methods for checking WhatsApp registration status, fetching contact information, and retrieving profile pictures.

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Access

Access contact operations through the client: 
let contacts = client.contacts();

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Methods

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is_on_whatsapp

Check if phone numbers are registered on WhatsApp. 
pub async fn is_on_whatsapp(
    &self,
    phones: &[&str],
) -> Result<Vec<IsOnWhatsAppResult>, anyhow::Error>
Parameters:
  • phones - Array of phone numbers (with or without + prefix)
Returns:
  • Vec<IsOnWhatsAppResult> - Registration status for each number
IsOnWhatsAppResult fields:
  • jid: Jid - WhatsApp JID for the number
  • is_registered: bool - Whether the number is on WhatsApp
Example: 
let phones = vec!["15551234567", "+15559876543"];
let results = client.contacts().is_on_whatsapp(&phones).await?;

for result in results {
    if result.is_registered {
        println!("{} is on WhatsApp", result.jid);
    } else {
        println!("{} is NOT on WhatsApp", result.jid);
    }
}

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get_info

Get detailed contact information for phone numbers. 
pub async fn get_info(
    &self,
    phones: &[&str],
) -> Result<Vec<ContactInfo>, anyhow::Error>
Parameters:
  • phones - Array of phone numbers (with or without + prefix)
Returns:
  • Vec<ContactInfo> - Detailed info for each registered number
ContactInfo fields:
  • jid: Jid - WhatsApp JID
  • lid: Option<Jid> - LID (privacy identifier) if available
  • is_registered: bool - Whether on WhatsApp
  • is_business: bool - Whether this is a business account
  • status: Option<String> - Status message/about
  • picture_id: Option<u64> - Profile picture ID
Example: 
let phones = vec!["15551234567"];
let contacts = client.contacts().get_info(&phones).await?;

for contact in contacts {
    println!("JID: {}", contact.jid);
    println!("  Registered: {}", contact.is_registered);
    println!("  Business: {}", contact.is_business);
    
    if let Some(status) = contact.status {
        println!("  Status: {}", status);
    }
    
    if let Some(lid) = contact.lid {
        println!("  LID: {}", lid);
    }
    
    if let Some(pic_id) = contact.picture_id {
        println!("  Picture ID: {}", pic_id);
    }
}

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get_profile_picture

Get the profile picture URL for a JID. 
pub async fn get_profile_picture(
    &self,
    jid: &Jid,
    preview: bool,
) -> Result<Option<ProfilePicture>, anyhow::Error>
Parameters:
  • jid - Target JID (user, group, or newsletter)
  • preview - true for preview thumbnail, false for full-size image
Returns:
  • Option<ProfilePicture> - Picture info or None if not available
ProfilePicture fields:
  • id: String - Picture ID
  • url: String - Download URL
  • direct_path: Option<String> - Direct path for media download
Example: 
let jid: Jid = "15551234567@s.whatsapp.net".parse()?;

// Get preview thumbnail
if let Some(preview) = client.contacts().get_profile_picture(&jid, true).await? {
    println!("Preview URL: {}", preview.url);
    println!("Picture ID: {}", preview.id);
}

// Get full-size picture
if let Some(full) = client.contacts().get_profile_picture(&jid, false).await? {
    println!("Full URL: {}", full.url);
    if let Some(path) = full.direct_path {
        println!("Direct path: {}", path);
    }
}

// Handle user with no profile picture
let no_pic_jid: Jid = "15559999999@s.whatsapp.net".parse()?;
if client.contacts().get_profile_picture(&no_pic_jid, true).await?.is_none() {
    println!("User has no profile picture");
}
For groups: 
let group_jid: Jid = "123456789@g.us".parse()?;
if let Some(pic) = client.contacts().get_profile_picture(&group_jid, true).await? {
    println!("Group picture: {}", pic.url);
}

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get_user_info

Get user information by JID (more detailed than get_info). 
pub async fn get_user_info(
    &self,
    jids: &[Jid],
) -> Result<HashMap<Jid, UserInfo>, anyhow::Error>
Parameters:
  • jids - Array of JIDs to query
Returns:
  • HashMap<Jid, UserInfo> - Map of JID to user info
UserInfo fields:
  • jid: Jid - WhatsApp JID
  • lid: Option<Jid> - LID if available
  • status: Option<String> - Status message
  • picture_id: Option<String> - Profile picture ID (String format)
  • is_business: bool - Whether business account
Example: 
let jids = vec![
    "15551234567@s.whatsapp.net".parse()?,
    "15559876543@s.whatsapp.net".parse()?,
];

let user_info = client.contacts().get_user_info(&jids).await?;

for (jid, info) in user_info {
    println!("User: {}", jid);
    println!("  Business: {}", info.is_business);
    
    if let Some(status) = info.status {
        println!("  Status: {}", status);
    }
    
    if let Some(pic_id) = info.picture_id {
        println!("  Picture ID: {}", pic_id);
    }
}

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Type Differences

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ContactInfo vs UserInfo

Both types provide similar information but with different use cases: ContactInfo (from get_info):
  • Input: phone numbers
  • picture_id: Option<u64> - Numeric picture ID
  • Used for batch phone number lookups
UserInfo (from get_user_info):
  • Input: JIDs
  • picture_id: Option<String> - String picture ID (may include non-numeric prefixes)
  • Used for detailed JID-based queries

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Privacy & TC Tokens

For user JIDs (not groups/newsletters), the library automatically includes TC tokens when fetching profile pictures. TC tokens are used for privacy-gated operations. The implementation automatically:
  • Looks up TC tokens for user JIDs
  • Includes tokens in profile picture requests
  • Skips tokens for groups and newsletters

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Error Handling

All methods return Result<T, anyhow::Error>. Common errors:
  • Invalid phone number format
  • Invalid JID format
  • Network errors
  • Rate limiting
match client.contacts().is_on_whatsapp(&["15551234567"]).await {
    Ok(results) => {
        for result in results {
            println!("Registered: {}", result.is_registered);
        }
    }
    Err(e) => eprintln!("Failed to check registration: {}", e),
}

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Batch Operations

All lookup methods support batch operations for efficiency: 
// Check multiple numbers at once
let phones = vec!["15551111111", "15552222222", "15553333333"];
let results = client.contacts().is_on_whatsapp(&phones).await?;

// Get info for multiple numbers
let contacts = client.contacts().get_info(&phones).await?;

// Get info for multiple JIDs
let jids = vec![
    "15551111111@s.whatsapp.net".parse()?,
    "15552222222@s.whatsapp.net".parse()?,
];
let user_info = client.contacts().get_user_info(&jids).await?;

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Empty Input Handling

Passing empty arrays returns empty results without making network requests: 
let empty: Vec<&str> = vec![];
let results = client.contacts().is_on_whatsapp(&empty).await?;
assert!(results.is_empty());