Tax ID Validator API

Overview

To use Tax ID Validator, you need an API key. You can get one by creating a free account and visiting your dashboard.

GET Endpoint

https://api.apiverve.com/v1/taxidvalidator

Example

How to call the Tax ID Validator API in different programming languages.

curl -X GET \
  "https://api.apiverve.com/v1/taxidvalidator?taxid=123-45-6789" \
  -H "X-API-Key: your_api_key_here"

const response = await fetch('https://api.apiverve.com/v1/taxidvalidator?taxid=123-45-6789', {
  method: 'GET',
  headers: {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
  }
});

const data = await response.json();
console.log(data);

import requests

headers = {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
}

response = requests.get('https://api.apiverve.com/v1/taxidvalidator?taxid=123-45-6789', headers=headers)

data = response.json()
print(data)

package main

import (
    "fmt"
    "io"
    "net/http"

)

func main() {
    req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/taxidvalidator?taxid=123-45-6789", nil)

    req.Header.Set("X-API-Key", "your_api_key_here")
    req.Header.Set("Content-Type", "application/json")

    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    body, _ := io.ReadAll(resp.Body)
    fmt.Println(string(body))
}

{
  "status": "ok",
  "error": null,
  "data": {
    "valid": true,
    "taxid": "123-45-6789",
    "type": "SSN",
    "type_full": "Social Security Number",
    "format": "XXX-XX-XXXX",
    "normalized": "123-45-6789",
    "digits_only": "123456789",
    "masked": "***-**-6789",
    "last4": "6789",
    "validation_details": {
      "format_valid": true,
      "area_number_valid": true,
      "group_number_valid": true,
      "serial_number_valid": true
    },
    "error": null
  }
}

Authentication

The Tax ID Validator API requires authentication via API key. Include your API key in the request header:

X-API-Key: your_api_key_here

Learn more about authentication →

Interactive API Playground

Test the Tax ID Validator API directly in your browser with live requests and responses.

Parameters

The following parameters are available for the Tax ID Validator API:

Response

The Tax ID Validator API returns responses in JSON, XML, YAML, and CSV formats. The JSON response is shown in the Example section above; alternative formats below.

Other Response Formats

<?xml version="1.0" encoding="UTF-8"?>
<response>
  <status>ok</status>
  <error xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/>
  <data>
    <valid>true</valid>
    <taxid>123-45-6789</taxid>
    <type>SSN</type>
    <type_full>Social Security Number</type_full>
    <format>XXX-XX-XXXX</format>
    <normalized>123-45-6789</normalized>
    <digits_only>123456789</digits_only>
    <masked>***-**-6789</masked>
    <last4>6789</last4>
    <validation_details>
      <format_valid>true</format_valid>
      <area_number_valid>true</area_number_valid>
      <group_number_valid>true</group_number_valid>
      <serial_number_valid>true</serial_number_valid>
    </validation_details>
    <error xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/>
  </data>
</response>

status: ok
error: null
data:
  valid: true
  taxid: 123-45-6789
  type: SSN
  type_full: Social Security Number
  format: XXX-XX-XXXX
  normalized: 123-45-6789
  digits_only: '123456789'
  masked: '***-**-6789'
  last4: '6789'
  validation_details:
    format_valid: true
    area_number_valid: true
    group_number_valid: true
    serial_number_valid: true
  error: null

Response Structure

All API responses follow a consistent structure with the following fields:

Learn more about response formats →

Response Data Fields

When the request is successful, the data object contains the following fields:

Headers

Only X-API-Key is required. Optional headers include Accept for response format negotiation (JSON, XML, or YAML), User-Agent, and X-Request-ID for request tracing. See all request headers →

GraphQL AccessALPHA

Access Tax ID Validator through GraphQL to combine it with other API calls in a single request. Query only the tax id validator data you need with precise field selection, and orchestrate complex data fetching workflows.

Credit Cost: Each API called in your GraphQL query consumes its standard credit cost.

POST https://api.apiverve.com/v1/graphql

query {
  taxidvalidator(
    input: {
      taxid: "123-45-6789"
    }
  ) {
    valid
    taxid
    type
    type_full
    format
    normalized
    digits_only
    masked
    last4
    validation_details {
      format_valid
      area_number_valid
      group_number_valid
      serial_number_valid
    }
    error
  }
}

Note: Authentication is handled via the x-api-key header in your GraphQL request, not as a query parameter.

CORS Support

The Tax ID Validator API accepts cross-origin requests from any origin, so it can be called directly from browser-based applications without a proxy. See CORS support →

Rate Limiting

Tax ID Validator requests are throttled per minute on the Free plan and unthrottled on paid plans. Exceeding the limit returns 429 Too Many Requests; rate-limit usage is reported in the X-RateLimit-Limit, X-RateLimit-Remaining, and X-RateLimit-Reset response headers. See per-plan limits and best practices →

Error Codes

The Tax ID Validator API uses standard HTTP status codes — 200 on success, 400 for invalid parameters, 401 for missing or invalid keys, 403 for insufficient credits, 429 for rate-limit exhaustion, and 500/503 for server-side issues. Each error response includes an X-Request-ID header you can quote when contacting support. See full error handling guide →

SDKs for Tax ID Validator

Official Tax ID Validator packages on npm, PyPI, NuGet, and JitPack — plus a Postman collection and an OpenAPI spec. See the SDK guide →

JitPack

No-Code Integrations

Tax ID Validator works with Zapier, Make, Pipedream, n8n, and Power Automate using the same API key. See setup guides →

Zapier

Make

Pipedream

n8n

Power Automate

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