Browser-side usage with fetch + FormData, driven by a file input.
Security: never expose your API key in production client-side code. Proxy these requests through your own backend. This example shows the raw request shape only.
Submits to POST /v1/tasks (task_type=instagram), polls POST /v1/gettasks, returns the result URL. For a server-side Node.js version see ../nodejs. Full docs: https://docs.checknumber.ai/instagram-bulk-number-checker