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VAT Checker API Helper

Prep requests for a VAT checker API by cleaning VAT numbers, validating country-specific format, and generating ready-to-use payloads and code snippets. This tool is offline (no API calls), so it won’t confirm registration status—use it to avoid bad inputs before you hit your own API or VIES-backed services.

Category: Finance · URL: /tools/vat-checker-api.html
What this tool does: local VAT format validation + API payload generation. It does not call VIES and cannot confirm if a VAT is active.
Tip: paste up to ~200 lines for best speed.
Need UK-specific checks? Use VAT Checker UK (GB/XI).
Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

Use this to catch formatting problems before calling a real VAT verification API.

  1. Paste one VAT number per line (or comma-separated).
  2. Select Country to force a prefix, or keep Auto to detect from the input.
  3. Click Validate format to get a JSON report, or Generate API payload to get request-ready payload + snippets.

Related tools: VAT Checker UK (GB/XI), Online JSON Converter, Base64 Format Checker.

Keywords this page targets (natural cluster): vat checker api, vat validation api, vat number checker api, eu vat api request, vies api payload, vat number format validator, validate vat number format, bulk vat number validation input, vat number normalization, vat checker json payload, vat api curl example, vat api javascript example, vat country code detection, greece el vat format, netherlands nl vat format, uk vat api format, xi vat number format, vat checker endpoint template, api request builder for vat, vat api query parameters
Secondary intents covered: Clean and normalize VAT numbers pasted from invoices/CSV exports, Detect country prefix and separate country code vs VAT body, Validate VAT number structure before calling a real validation service, Generate JSON payloads for a VAT validation endpoint, Create copy-paste cURL and JavaScript request templates, Batch-check multiple VAT numbers for obvious formatting issues, Standardize GB/UK and GR/EL prefixes, Produce a compact report for logging and QA

FAQ

Does this VAT checker API tool verify if a VAT number is active?

No. It only validates structure/format offline; active/registered status requires an external service (often VIES-backed) via your own API.

What input formats does it accept?

Paste VAT numbers with or without spaces/dashes, one per line or comma-separated; the tool normalizes to uppercase and removes separators.

Can it auto-detect the country code?

Yes—if the VAT includes a known two-letter prefix (e.g., DE, FR, NL). If not, choose a country to force a prefix.

Does it support UK VAT numbers?

It includes basic GB/XI format checks, but for UK-specific rules and deeper validation use the dedicated VAT Checker UK tool.

Why does Greece use EL instead of GR?

VIES commonly uses EL for Greece; this tool normalizes GR to EL for consistency.

Can I generate a payload for my own VAT validation endpoint?

Yes. Use “API payload” or “Payload + code snippets” to get a JSON body and ready-to-edit cURL/JS templates.

Is checksum validation included?

No. Different countries have different checksum rules; this tool focuses on fast format validation and clean request building.