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Check missing fields, nulls, types and boundaries

Field test data examples

Generate data for a required numeric field. Distinguish omission, null, type mismatches and out-of-range inputs.

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Worked example · fictional specification

Check omission, null and boundaries for age

age is a required number, does not accept null and includes both endpoints of 18–65. Define error messages and status codes from your service specification.

1. Enter data

Field: age
Type: number
Required: yes / Allow null: no
Minimum: 18 / Maximum: 65 / Step: 1
  1. Set the name, type, required/null policy and range as shown.
  2. Generate data and review its category, test perspective and request JSON.
  3. Apply one input at a time in your form or request body and record the observed outcome.

2. Read the result

Perspective (Korean tool output)Request JSONExpected check (Korean tool output)
필드 누락{}정의한 규칙에 따라 거부 (오류 코드·문구는 명세 확인)
null{"age":null}정의한 규칙에 따라 거부 (오류 코드·문구는 명세 확인)
숫자 범위{"age":17}정의한 규칙에 따라 거부 (오류 코드·문구는 명세 확인)
숫자 범위{"age":18}추가 업무 규칙이 없다면 허용
숫자 범위{"age":19}추가 업무 규칙이 없다면 허용
숫자 범위{"age":64}추가 업무 규칙이 없다면 허용
숫자 범위{"age":65}추가 업무 규칙이 없다면 허용
숫자 범위{"age":66}정의한 규칙에 따라 거부 (오류 코드·문구는 명세 확인)
범위 내 대표값{"age":41.5}추가 업무 규칙이 없다면 허용
빈 문자열{"age":""}정의한 규칙에 따라 거부 (오류 코드·문구는 명세 확인)
숫자 대신 문자열{"age":"18"}숫자 타입 기준 거부. 자동 형변환 정책이 있다면 별도 검토
불리언{"age":true}정의한 규칙에 따라 거부 (오류 코드·문구는 명세 확인)

Swipe the table sideways to see all columns.

3. Use it in your tests

{} omits age; {"age":null} includes it with a null value. {"age":"18"} uses a string instead of a number. Boundary rows contain both acceptable and rejected values, so read the expected outcome too.

Limits and additional checks

This numeric example does not enforce integer-only input. Add 18.5 separately if your service requires integers. Adapt string character/byte counts and email formats to the actual policy.

View the tool screen
QA Workbench fielddata result screen
A screen captured with fictional inputs. Screen settings can differ from the reproducible example above.

Download the example table (CSV)Download the input example (TXT)

Written and checked against the tool by QA Workbench · 2026-10-14. Fictional inputs; this is not a record of tests run against a service.

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