curl --request GET \
  --url 'https://api.keyapi.ai/v1/instagram/user_id_to_username?user_id=18527' \
  --header 'Authorization: Bearer <YOUR_API_KEY>'

{
  "code": 0,
  "message": "success",
  "data": {
    "strong_id__": "18527",
    "pk": "18527",
    "highlights_tray_type": "DEFAULT",
    "id": "18527",
    "profile_pic_url": "https://scontent-ord5-2.cdninstagram.com/v/t51.2885-19/460170653_852233457013406_8133149038171915885_n.jpg?stp=dst-jpg_s150x150_tt6&efg=eyJ2ZW5jb2RlX3RhZyI6InByb2ZpbGVfcGljLmRqYW5nby4xMDgwLmMyIn0&_nc_ht=scontent-ord5-2.cdninstagram.com&_nc_cat=102&_nc_oc=Q6cZ2QGeOeZ0egfhF9f1dMHH3FKxU2K9qMgkcflUK5CTbCN2ig9KaNvRQllD6Mb-H0nNtIc&_nc_ohc=SMQ29bnLUloQ7kNvwF3wV4E&_nc_gid=37-yAcP-0rjBVfkBSkGTbQ&edm=AEF8tYYBAAAA&ccb=7-5&oh=00_Afzvd5uAMDRo3QJL9NANzZNaWrtVdc_hUk27DW9YPNecpQ&oe=69ADBA3F&_nc_sid=1e20d2",
    "username": "javan",
    "show_ig_app_switcher_badge": false
  },
  "requestId": "ea456b11-c64d-4c29-bd4f-fad4e67a6c8c"
}