Phone Number Validation API: Bulk Format & Validity Check

Validate international phone numbers from an uploaded list (format, validity, and related numbering metadata). Uses the same batch task flow as other v1 checkers.

Upload detection file — example:

curl --location 'https://api.numberchecker.ai/v1/tasks' \
--header 'X-API-Key: API-KEY' \
--form 'file=@"./numbers.txt"' \
--form 'task_type="phoneCheck"'

Check task status — example:

curl --location 'https://api.numberchecker.ai/v1/gettasks' \
--header 'X-API-Key: API-KEY' \
--form 'task_id="task_id"'

Response after upload succeeds

{
    "task_id": "d4g8o46p2jvh04o9uolg",
    "status": "pending",
    "total": 2049,
    "message": "Task created successfully",
    "created_at": "2025-11-21T15:58:08.916446594Z"
}

Response while processing

{
    "created_at": "2025-11-21T08:27:09.933Z",
    "updated_at": "2025-11-21T08:27:10.241Z",
    "task_id": "d4g24nep2jvh04o9uoh0",
    "user_id": "wfi7wGPS4B4PdtTMox5Y",
    "status": "processing",
    "total": 2049,
    "success": 1024,
    "failure": 0
}

Response when finished (exported)

{
    "created_at": "2025-11-21T08:27:09.933Z",
    "updated_at": "2025-11-21T08:27:10.241Z",
    "task_id": "d4g24nep2jvh04o9uoh0",
    "user_id": "wfi7wGPS4B4PdtTMox5Y",
    "status": "exported",
    "total": 2049,
    "success": 2049,
    "failure": 0,
    "result_url": "https://example-link-to-results.zip"
}

Upload file request URL

POST https://api.numberchecker.ai/v1/tasks

Upload file request parameters

Parameter	Description
file	file, one phone number per line (E.164 recommended, e.g. +41798284651)
task_type	string, set to phoneCheck

Check task status request URL

POST https://api.numberchecker.ai/v1/gettasks

Check task status request parameters

Parameter	Description
task_id	string, Task ID returned from task creation

Result fields

Field	Description
Number	Phone number in E.164 format
phoneCheck	Validation outcome / detail (per exported column headers)

Response format

Field	Description
created_at	Timestamp when task was created
updated_at	Timestamp of last task status update
task_id	Unique task identifier
user_id	User ID
status	pending · processing · exported
total	Total lines processed
success	Successful rows
failure	Failed rows
result_url	Download URL when status is exported

Status codes

Status	Description
200	charge, request successful
400	free, bad request
500	free, server error