M
API Matrix

Cloudmersive Validate API

⭐ Beginner's Pick Phone / API Key Intermediate HTTPS CORS
Varies by plan (check documentation)
77 Score
Grade B
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Overview

Cloudmersive Validate API provides international phone number validation with detailed parsing, including country code detection, formatting, and line type identification. It supports REST requests with a simple JSON body and returns structured validation results. You need a free Cloudmersive API key to get started.

💡

Beginner Tip

Send the phone number as a plain string in the JSON body — Cloudmersive handles the parsing, so you do not need to pre-format the number yourself.

Available Data

country name and code
population
capital city
region and subregion
flag image URL
phone number validation

Example Response

JSON Response 
{
  "name": "Japan",
  "capital": "Tokyo",
  "population": 125800000,
  "region": "Asia",
  "languages": [
    "Japanese"
  ],
  "flag": "https://flagcdn.com/jp.svg",
  "currencies": [
    {
      "code": "JPY",
      "name": "Japanese yen"
    }
  ]
}

Field Reference

IsValid Whether the phone number is considered valid.
E164Format The phone number reformatted in international E.164 standard (e.g., +14158586273).
CountryCode ISO 2-letter country code the number belongs to.
PhoneNumberType The type of phone number: mobile, fixed-line, or other.
FormattedPhoneNumber Human-readable formatted version of the phone number with country format applied.

Implementation Example 

const url = "https://cloudmersive.com/phone-number-validation-API";
// Replace headers or query params with the values required by this API.
const response = await fetch(url, {
  headers: {
  "X-API-Key": "YOUR_API_KEY"
  }
});
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

What Can You Build?

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

Common Errors & Troubleshooting

401 Unauthorized The Apikey header is missing or the key is invalid.
✓ Get a free API key at cloudmersive.com and include it as the Apikey request header.
IsValid: false for a real number The number was submitted without its international dialing prefix.
✓ Include the + and country code (e.g., +1 for US, +44 for UK) to ensure correct validation.
Request body not accepted The Content-Type header was not set to application/json.
✓ Always include Content-Type: application/json and send the number as a JSON string, not plain text.

Matrix Score Breakdown

🌐 Reachability 30/30
⚡ Speed 5/20
🔒 Security 15/15
🛠 Developer XP 17/20
✓ Reliability 10/15

Partially tested on Apr 5, 2026

Technical Specifications

Auth API Key
HTTPS REQUIRED
CORS YES
Category Phone
Difficulty Intermediate
Verified: 2026-04-04

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