Complies with E.164 standard Intelligent Unified Format

International Phone Number Validation and Correction

Validate international phone numbers and normalize valid values to E.164

What can this API do?

Numbering-plan validation

Check whether an international number is valid under its regional numbering plan.

E.164 normalization

Return valid numbers in a consistent international format for storage and exchange.

Flexible input formatting

Accept common separators such as spaces, hyphens, periods, and parentheses.

Country and calling codes

Return the calling code and ISO region codes when they can be determined.

Clear invalid-number results

Distinguish malformed input from a well-formed number that is not valid.

Contact-data workflows

Prepare phone data for CRM, registration, messaging, and voice applications.

API Document

HTTP Protocol:HTTPS

HTTP Method:GET

HTTP Endpoint:https://api.gugudata.io/v1/websitetools/international-phone-format

Response Type:application/json; charset=utf-8

DEMO Endpoint:https://api.gugudata.io/v1/websitetools/international-phone-format/demo

Live Demo:Try Interactive Demo

Postman Collection:Run in Postman

API Request Parameters

Name	Type	Is Required	Default Value	Remark
appkey	string	true	YOUR_APPKEY	API key used to authenticate the request.
phone	string	true	+1 (817) 569-8900	International number beginning with +, up to 64 characters. Spaces, hyphens, periods, and parentheses are accepted.

API Response Parameters

Name	Type	Remark
dataStatus	object	Response metadata for the request.
dataStatus.requestParameter	string	Privacy-safe summary of the normalized request.
dataStatus.statusCode	integer	Application-level status code.
dataStatus.status	string	Application-level result status.
dataStatus.statusDescription	string	Human-readable application status message.
dataStatus.responseDateTime	string	Time at which the response was generated.
dataStatus.dataTotalCount	integer	Number of matching or returned records for this request.
data	object	Phone validation result.
data.isValid	boolean	Whether the number is valid under the applicable numbering plan.
data.correctedMobileNumber	string	Valid number normalized to E.164, or an empty string when invalid.
data.countryCode	string	International calling code when determinable.
data.countryCode2	string	ISO 3166-1 alpha-2 region code when determinable.
data.countryCode3	string	ISO 3166-1 alpha-3 region code when determinable.

API Response Status Codes

Status Code	Explanation of Status Code	Remarks
200	Request processed successfully.	Some endpoints expose a separate application-level status field in the response body, such as `dataStatus.statusCode`.
400	Invalid request parameters or request format.	Check required fields, data types, and request body format.
401	Missing or unknown application key.	Provide a valid `appkey` with the request.
403	The application key is recognized but access is not allowed.	The key may be expired, inactive, or not permitted for the requested API.
429	Request rate or trial usage limit exceeded.	Reduce request frequency and retry with backoff. If a trial allowance is exhausted, check Trial Keys for remaining requests and subscribe to continue.
500	Internal service error.	Retry later or contact support if the error persists.
503	Upstream service unavailable.	Retry later; the requested upstream dependency is temporarily unavailable.

Remote MCP

AI client access

Use this API through GuGuData Remote MCP

Connect your AI client once, authorize in the browser, and the client can use the GuGuData API tools available to your account. You do not need to paste an appkey into the MCP client.

Endpoint https://mcp.gugudata.io/mcp

Open MCP Guide

Generic MCP configuration

{
  "mcpServers": {
    "gugudata": {
      "url": "https://mcp.gugudata.io/mcp",
      "transportType": "streamable-http"
    }
  }
}

Code Snippets

Run in Postman Open LLM Page

Plan and usage

Common questions about request limits, trials, renewal, and cancellation.

What does the 5 requests per second limit mean?

It is a request-rate limit, not a concurrency allowance. Keep your request rate at or below 5 per second. If the service returns a rate-limit response, reduce the frequency and retry with backoff.

Is total paid usage limited?

There is no total request cap during an active paid subscription and no usage-based overage charge.

How does the free trial work?

Each account can receive a limited trial key. Requests are shared across APIs in the same category. Check Trial Keys for the exact allowance and remaining requests.

How do renewal and cancellation work?

The plan renews annually until canceled. Manage or cancel the renewal from Dashboard → Orders & Billing. Access continues through the paid period after cancellation. See the Terms of Service for the current refund policy. If the billing portal is unavailable, contact support.