Create N number of GCP compute instances using Rest api

How to create n number of instances in GCP using rest api.
in AWS java SDK, there is a method withMaxCount where we specify number of ec2 instances.
Similarly is there anything for GCP compute.

You can use REST API in loop to create instances.
Example request will look something like this:

{
  "kind": "compute#instance",
  "name": "INSTANCE-NAME",
  "zone": "projects/PROJECT-NAME/zones/us-central1-a",
  "machineType": "projects/PROJECT-NAME/zones/us-central1-a/machineTypes/e2-medium",
  "displayDevice": {
    "enableDisplay": false
  },
  "metadata": {
    "kind": "compute#metadata",
    "items": []
  },
  "tags": {
    "items": []
  },
  "disks": [
    {
      "kind": "compute#attachedDisk",
      "type": "PERSISTENT",
      "boot": true,
      "mode": "READ_WRITE",
      "autoDelete": true,
      "deviceName": "INSTANCE-NAME",
      "initializeParams": {
        "sourceImage": "projects/debian-cloud/global/images/debian-10-buster-v20210122",
        "diskType": "projects/PROJECT-NAME/zones/us-central1-a/diskTypes/pd-standard",
        "diskSizeGb": "10",
        "labels": {}
      },
      "diskEncryptionKey": {}
    }
  ],
  "canIpForward": false,
  "networkInterfaces": [
    {
      "kind": "compute#networkInterface",
      "subnetwork": "regions/us-central1/subnetworks/default",
      "accessConfigs": [
        {
          "kind": "compute#accessConfig",
          "name": "External NAT",
          "type": "ONE_TO_ONE_NAT",
          "networkTier": "PREMIUM"
        }
      ],
      "aliasIpRanges": []
    }
  ],
  "description": "",
  "labels": {},
  "scheduling": {
    "preemptible": false,
    "onHostMaintenance": "MIGRATE",
    "automaticRestart": true,
    "nodeAffinities": []
  },
  "deletionProtection": false,
  "reservationAffinity": {
    "consumeReservationType": "ANY_RESERVATION"
  },
  "serviceAccounts": [
    {
      "email": "111111111111-compute@developer.gserviceaccount.com",
      "scopes": [
        "https://www.googleapis.com/auth/devstorage.read_only",
        "https://www.googleapis.com/auth/logging.write",
        "https://www.googleapis.com/auth/monitoring.write",
        "https://www.googleapis.com/auth/servicecontrol",
        "https://www.googleapis.com/auth/service.management.readonly",
        "https://www.googleapis.com/auth/trace.append"
      ]
    }
  ],
  "shieldedInstanceConfig": {
    "enableSecureBoot": false,
    "enableVtpm": true,
    "enableIntegrityMonitoring": true
  },
  "confidentialInstanceConfig": {
    "enableConfidentialCompute": false
  }
}

Replace it with your own project name and service account, and you can test it here.