Check Whether a Number Is on WhatsApp
View All WhatsApp Messaging API APIs →Check whether a given phone number has an active WhatsApp account, using a connected session. Pass the full international number (digits only, no +) in the path. Returns the phoneNumber and an exists flag. Use it to validate recipients before sending to improve deliverability and reduce wasted sends.
API Features
Recipient validation Confirm a number is on WhatsApp before you attempt to message it
Session-based check Uses your connected session so results reflect a live WhatsApp query
Simple yes/no Returns a clear exists flag alongside the number you asked about
Live API Demo
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API Response (JSON)
{} Query Result
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Use Cases
- Pre-send validation to avoid messaging non-WhatsApp numbers
- List hygiene: flag inactive or invalid numbers in a contact list
- Signup flows: confirm WhatsApp availability before choosing it as a channel