---
updatedAt: 2025-09-18T12:24:20.000Z
agentTools:
  projectIndex: https://foxentry.dev/llms.txt
---

# Validator errors and fixes

As you begin to use our API, you might wonder what kinds of errors and fixes you are going to encounter. Here you can find all of them in one place.

Both errors and fixes follow the same structure of group, type and subtype. Additionally, errors returned by our API contain a description, which is not included here.

## ❌ Errors

| Group    | Type                  | Subtype                          |
| -------- | --------------------- | -------------------------------- |
| FORMAT   | CHARACTERS            | CASE\_SENSITIVITY                |
| FORMAT   | CHARACTERS            | DIACRITICS                       |
| FORMAT   | CHARACTERS            | SPECIAL                          |
| FORMAT   | CHARACTERS            | WHITESPACES                      |
| INTERNAL | BILLING               |                                  |
| INTERNAL | DATABASE              | CONNECTION                       |
| INTERNAL | DATABASE              | ERROR                            |
| INTERNAL | DATASTORE             | NOT\_AVAILABLE                   |
| INTERNAL | ERROR                 |                                  |
| INTERNAL | TIMEOUT               |                                  |
| REQUEST  | API\_VERSION          |                                  |
| REQUEST  | AUTH                  |                                  |
| REQUEST  | AUTH                  | KEY                              |
| REQUEST  | AUTH                  | TOKEN                            |
| REQUEST  | BILLING               | NO\_CREDIT                       |
| REQUEST  | BILLING               | SERVICE\_LIMIT\_REACHED          |
| REQUEST  | BODY                  | EMPTY                            |
| REQUEST  | BODY                  | INVALID                          |
| REQUEST  | BODY                  | NOT\_JSON                        |
| REQUEST  | BODY                  | NO\_REQUESTS                     |
| REQUEST  | BODY                  | TOO\_BIG                         |
| REQUEST  | ENDPOINT              | NOT\_AVAILABLE                   |
| REQUEST  | ENDPOINT              | NOT\_FOUND                       |
| REQUEST  | NOT\_ALLOWED          | DOMAIN                           |
| REQUEST  | NOT\_ALLOWED          | IP                               |
| REQUEST  | NOT\_ALLOWED          | METHOD                           |
| REQUEST  | OPTIONS               | PARAMETERS\_COMBINATION          |
| REQUEST  | OPTIONS               | PARAMETER\_NOT\_SUPPORTED        |
| REQUEST  | OPTIONS               | PARAMETER\_VALUE\_NOT\_SUPPORTED |
| REQUEST  | PROJECT               | NOT\_FOUND                       |
| REQUEST  | PROJECT               | NO\_DATA                         |
| REQUEST  | QUERY                 | NOT\_SENT                        |
| REQUEST  | QUERY                 | PARAMETERS\_COMBINATION          |
| REQUEST  | QUERY                 | PARAMETER\_MISSING               |
| REQUEST  | QUERY                 | PARAMETER\_NOT\_SUPPORTED        |
| REQUEST  | QUERY                 | PARAMETER\_REQUIRED              |
| REQUEST  | QUERY                 | PARAMETER\_VALUE\_NOT\_SUPPORTED |
| REQUEST  | RATE\_LIMIT           | CREDIT\_PER\_DAY                 |
| REQUEST  | RATE\_LIMIT           | CREDIT\_PER\_IP                  |
| REQUEST  | RATE\_LIMIT           | TOO\_MANY\_REQUESTS              |
| SYNTAX   | CHARACTERS            | NOT\_ALLOWED                     |
| SYNTAX   | CHARACTERS            | WHITESPACES                      |
| SYNTAX   | INVALID               |                                  |
| SYNTAX   | UNABLE\_TO\_PROCESS   |                                  |
| SYNTAX   | VALUE\_LENGTH         | TOO\_LONG                        |
| SYNTAX   | VALUE\_LENGTH         | TOO\_SHORT                       |
| SYNTAX   | VALUE\_PART           | DOMAIN                           |
| SYNTAX   | VALUE\_PART\_EXTRA    | AT\_SIGN                         |
| SYNTAX   | VALUE\_PART\_EXTRA    | CONTEXT                          |
| SYNTAX   | VALUE\_PART\_EXTRA    | LEGAL\_FORM                      |
| SYNTAX   | VALUE\_PART\_EXTRA    | PLUS\_SIGN                       |
| SYNTAX   | VALUE\_PART\_MISSING  | AT\_SIGN                         |
| SYNTAX   | VALUE\_PART\_MISSING  | CITY                             |
| SYNTAX   | VALUE\_PART\_MISSING  | LEGAL\_FORM                      |
| SYNTAX   | VALUE\_PART\_MISSING  | NAME                             |
| SYNTAX   | VALUE\_PART\_MISSING  | NUMBER                           |
| SYNTAX   | VALUE\_PART\_MISSING  | NUMBER\_PART                     |
| SYNTAX   | VALUE\_PART\_MISSING  | PLUS\_SIGN                       |
| SYNTAX   | VALUE\_PART\_MISSING  | PREFIX                           |
| SYNTAX   | VALUE\_PART\_MISSING  | STREET                           |
| SYNTAX   | VALUE\_PART\_MISSING  | SURNAME                          |
| SYNTAX   | VALUE\_PART\_MISSING  | TLD                              |
| SYNTAX   | VALUE\_PART\_MISSING  | ZIP                              |
| SYNTAX   | VALUE\_PART\_POSITION | DEGREE                           |
| SYNTAX   | VALUE\_PART\_POSITION | TLD                              |
| VALUE    | EMPTY                 |                                  |
| VALUE    | INCORRECT\_ORDER      |                                  |
| VALUE    | INVALID               |                                  |
| VALUE    | INVALID               | CONNECTION                       |
| VALUE    | INVALID               | DEGREE                           |
| VALUE    | INVALID               | DOMAIN                           |
| VALUE    | INVALID               | DOMAIN\_DNS                      |
| VALUE    | INVALID               | NAME                             |
| VALUE    | INVALID               | NAMESURNAME                      |
| VALUE    | INVALID               | PREFIX                           |
| VALUE    | INVALID               | SURNAME                          |
| VALUE    | INVALID\_COMBINATION  |                                  |
| VALUE    | NOT\_ALLOWED          | CITYFORMAT                       |
| VALUE    | NOT\_ALLOWED          | CONTEXT                          |
| VALUE    | NOT\_ALLOWED          | COUNTRYFORMAT                    |
| VALUE    | NOT\_ALLOWED          | DEGREE                           |
| VALUE    | NOT\_ALLOWED          | DISPOSABLE                       |
| VALUE    | NOT\_ALLOWED          | FREEMAIL                         |
| VALUE    | NOT\_ALLOWED          | PREFIX                           |
| VALUE    | TEMPORARY\_INVALID    | NOT\_AVAILABLE                   |
| VALUE    | TEMPORARY\_INVALID    | OVER\_QUOTA                      |

<br />

## 🛠️ Fixes

| Group  | Type                 | Subtype           |
| :----- | :------------------- | :---------------- |
| FORMAT | CHANGED              |                   |
| FORMAT | CHANGED              | CASE\_SENSITIVITY |
| FORMAT | CHANGED              | DIACRITICS        |
| FORMAT | CHANGED              | WHITESPACES       |
| SYNTAX | VALUE\_CHANGED       |                   |
| SYNTAX | VALUE\_PART\_ADDED   | AT\_SIGN          |
| SYNTAX | VALUE\_PART\_ADDED   | DOMAIN\_TLD       |
| SYNTAX | VALUE\_PART\_ADDED   | LEGAL\_FORM       |
| SYNTAX | VALUE\_PART\_ADDED   | NUMBER            |
| SYNTAX | VALUE\_PART\_ADDED   | NUMBER\_PART      |
| SYNTAX | VALUE\_PART\_ADDED   | PLUS\_SIGN        |
| SYNTAX | VALUE\_PART\_CHANGED |                   |
| SYNTAX | VALUE\_PART\_CHANGED | CHARACTERS        |
| SYNTAX | VALUE\_PART\_CHANGED | DOMAIN            |
| SYNTAX | VALUE\_PART\_CHANGED | LEGAL\_FORM       |
| SYNTAX | VALUE\_PART\_CHANGED | PREFIX            |
| SYNTAX | VALUE\_PART\_CHANGED | WHITESPACES       |
| SYNTAX | VALUE\_PART\_REMOVED | AT\_SIGN          |
| SYNTAX | VALUE\_PART\_REMOVED | CONTEXT           |
| SYNTAX | VALUE\_PART\_REMOVED | DUPLICITY         |
| SYNTAX | VALUE\_PART\_REMOVED | LEGAL\_FORM       |
| SYNTAX | VALUE\_PART\_REMOVED | PLUS\_SIGN        |
| VALUE  | ADDED                |                   |
| VALUE  | CHANGED              |                   |
| VALUE  | CHANGED              | INTERNAL\_RULE    |
| VALUE  | CHANGED              | TYPO              |
| VALUE  | PART\_CHANGED        |                   |
| VALUE  | PART\_CHANGED        | CITY              |
| VALUE  | PART\_CHANGED        | NUMBER            |
| VALUE  | PART\_CHANGED        | STREET            |
| VALUE  | PART\_CHANGED        | ZIP               |
| VALUE  | REMOVED              |                   |