Check given customer email is available by rest/V1/customers/isEmailAvailable REST API Magento 2.

You can verify given Emai address is available on the website using Endpoint /V1/customers/isEmailAvailable.

If You have provided websiteId field in the POST Body, search the email id in the given website scope.

If an email exists on the given website, the response will be false because the same email id already exists on the given website else the response will be true.

Action: POST
URL: <Host_Url>/rest/default/V1/customers/isEmailAvailable

HEADER: NULL

Request Payload:

{
    "customerEmail": "rakeshjesadiya@rakeshjesadiya.com",
    "websiteId": "2" //OPTIONAL FIELD
}

Response: Boolean

If the given email id is available in the website id 2, Output will be false otherwise true.