Boolean schema `false` is ignored · rjsf-team/react-jsonschema-form#4528

2025-03-17T12:31:40.000Z

### Prerequisites - [x] I have searched the existing issues - [x] I understand that providing a [SSCCE](http://sscce.org/) example is tremendously useful to the maintainers. - [x] I have read the [documentation](https://rjsf-team.github.io/react-jsonschema-form/docs) - [x] Ideally, I'm providing a [sample JSFiddle](https://jsfiddle.net), [Codesandbox.io](https://codesandbox.io) or preferably a [shared playground link](https://rjsf-team.github.io/react-jsonschema-form/) demonstrating the issue. ### What theme are you using? core ### Version 5.x ### Current Behavior Given the following schema: ```json { "type": "number", "if": { "const": 13 }, "then": false } ``` Value `13` is a valid value. ### Expected Behavior In JSON Schema, `false` equals `{"not": {}}` [link to spec](https://json-schema.org/draft-06/draft-wright-json-schema-01#rfc.section.4.4) Thus, the schema above with value 13 should be invalid. ### Steps To Reproduce 1. [Playground example](https://rjsf-team.github.io/react-jsonschema-form/#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) 2. Input value 13 3. Click Submit Expected: validation fails Actual: Form submitted If you click "Raw validate", you can see the AJV validation error. ### Environment ```markdown Playground ``` ### Anything else? Please note that if `false` is replaced with `{"not": {}}`, everything works as expected: [playground](https://rjsf-team.github.io/react-jsonschema-form/#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)

(5 comments) (0 reactions) (0 assignees)TypeScript (13,175 stars) (2,136 forks)batch import

bughelp wanted

Description

Prerequisites

I have searched the existing issues
I understand that providing a SSCCE example is tremendously useful to the maintainers.
I have read the documentation
Ideally, I'm providing a sample JSFiddle, Codesandbox.io or preferably a shared playground link demonstrating the issue.

What theme are you using?

core

Version

5.x

Current Behavior

Given the following schema:

{
  "type": "number",
  "if": {
    "const": 13
  },
  "then": false
}

Value 13 is a valid value.

Expected Behavior

In JSON Schema, false equals {"not": {}} link to spec

Thus, the schema above with value 13 should be invalid.

Steps To Reproduce

Playground example
Input value 13
Click Submit

Expected: validation fails

Actual: Form submitted

If you click "Raw validate", you can see the AJV validation error.

Environment

Playground

Anything else?

Please note that if false is replaced with {"not": {}}, everything works as expected: playground

Contributor guide

Tech stack: typescriptreactnodejs
Domain: frontend
Issue type: bug
Difficulty: 3
Estimated time: 1-3 hours
Activity status: active
Clarity: clear
Prerequisites: Basic knowledge of JSON SchemaFamiliarity with ReactUnderstanding of AJV validation
Newbie friendliness: 60
Research direction: Investigate how the library handles boolean schemas in conditional branches (if/then/else). The validation logic likely resides in `src/utils/validate.js` or similar. The issue mentions that replacing `false` with `{"not": {}}` works, so the fix likely involves converting boolean values to equivalent schema objects before validation. Check the AJV configuration and how schemas are processed. Look at how the `then` keyword is resolved when it is a boolean. The existing playground links provide reproduction cases.