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maximum JSON Schema Keyword

Use maximum to require a numeric value to be less than or equal to an upper bound.

Number

Schema template

Try in Validator

JSON Schema

{
  "type": "number",
  "maximum": 100
}

Valid example JSON

99.5

Invalid example JSON

101

Fields

FieldTypeRequiredDescription
maximumnumberYesThe inclusive upper bound for number or integer values.

How to use this schema

Use maximum for caps such as page size, upload count, discount percentage, or score. Combine it with minimum to make error messages precise.

Version support and combinations

This keyword or pattern is commonly supported across modern JSON Schema workflows. Check your validator for Draft-04, Draft-07, 2019-09, and 2020-12 behavior before relying on newer composition or conditional features.

Common combination: pair this reference with type, required, and properties so validation errors are specific enough for API clients and form users.

Batch validation seed

Want to validate JSON Schema in bulk? Toolumina Pro can grow into batch validation for 100+ files, saved schemas, and repeatable API contract checks.

Related reference pages

minimum JSON Schema KeywordUse minimum to require a numeric value to be greater than or equal to a lower bound.multipleOf JSON Schema KeywordUse multipleOf to require numbers to align to a step size, such as cents, pack sizes, grid units, or batch increments.type JSON Schema KeywordUse type to require a JSON value to be a string, number, integer, boolean, object, array, or null before other rules are evaluated.