Requires Node.js 18+ (built-in fetch / FormData). No dependencies.
export CHECKNUMBER_API_KEY="YOUR_API_KEY"
node instagram_checker.js # reads numbers.txt (one E.164 number per line)Submits numbers.txt to POST /v1/tasks (task_type=instagram), polls POST /v1/gettasks, and downloads the result file. Full docs: https://docs.checknumber.ai/instagram-bulk-number-checker