Boundary Number Dataset Generator

Runs in browser Test Data

Produce boundary-value datasets for 8/16/32/64-bit integers, custom ranges, decimals and lengths — the core of boundary value analysis.

TEST DATA ONLY — all generated names, contacts, identifiers and numbers are synthetic and do not belong to real people or accounts.
Privacy: This tool runs entirely in your browser. Your input never leaves your device.

How to use Boundary Number Dataset Generator

  1. Choose integer widths, a custom range or string lengths.
  2. Adjust the widths, bounds or lengths.
  3. Press Generate and use the expected column in your assertions.

Boundary Number Dataset Generator features

  • Signed and unsigned 8/16/32/64-bit boundaries: min−1, min, min+1, 0, 1, max−1, max, max+1
  • JavaScript 2^53 safe-integer boundary for 64-bit
  • Custom numeric ranges with decimals and a step
  • String-length boundaries including multibyte and astral characters
  • Every row labelled valid/invalid with a note
  • JSON, CSV, SQL, XML, JSON Lines or table output

Boundary Number Dataset Generator example

INT32 boundaries

Input:

Boundaries for: Integer widths · Widths: 32 · Signed

Output:

case,value,expected
INT32_MIN − 1,-2147483649,invalid
INT32_MIN,-2147483648,valid
INT32_MAX,2147483647,valid
INT32_MAX + 1,2147483648,invalid

Frequently asked questions about Boundary Number Dataset Generator

What is boundary value analysis?

A test-design technique that checks the values right at and around a limit — min−1, min, min+1, max−1, max, max+1 — where off-by-one bugs live.

Which integer widths are covered?

Signed and unsigned 8, 16, 32 and 64-bit, plus JavaScript's 2^53 safe-integer boundary. 64-bit values are strings so they stay exact.

Can I use my own range or string lengths?

Yes. Custom mode takes any numeric range with optional decimals; length mode produces strings at min/max length ± 1 including multibyte and astral-character variants.