Boundary value analysis
Use boundary value analysis to check values inside and outside a numeric range. Work through an integer age range of 18–65.
Generate boundary values →- No account or installation
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Example: integers from 18 through 65
If both endpoints are inclusive, accept 18 and 65 and reject 17 and 66. A typical boundary set is 17, 18, 19, 64, 65, 66. Testing only a value in the middle can miss endpoint comparison errors.
17 → 거절 / Reject 18, 19, 64, 65 → 허용 / Accept 66 → 거절 / Reject
Use the tool
Open Boundary value analysis, enter 18 as the minimum and 65 as the maximum, and generate values. Apply the results to your input field or API and compare acceptance with the specification. This website does not execute tests against your service.
Check other rules separately
Confirm endpoint inclusion, decimal support, units and rounding rules. Empty values, null and strings require checks beyond a numeric range. For multiple fields or request bodies, use the API test data guide.