rjsf-team/react-jsonschema-form

additionalProperties should be by default allowed

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#2137 opened on Nov 22, 2020

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corefeaturehelp wanted

Description

Prerequisites

Description

Json schema by default allows additional properties in objects (json-schema-doc, there is this paragraph "The additionalProperties keyword is used to control the handling of extra stuff, that is, properties whose names are not listed in the properties keyword. By default any additional properties are allowed."). In form, its unfortunately treated as false when not specified.

Playground

Steps to Reproduce

  1. Create schema with "type":"object" , without specified "additionalProperties".

Expected behavior

I should be able to add aditional properties to object.

Actual behavior

Its not possible to add additional properties

Version

2.4.0

Contributor guide

Tech stack
reacttypescript
Domain
frontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
JavaScriptReactJSON Schema
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70
Research direction
Investigate the default value of additionalProperties in the library's JSON Schema validation. The issue states that according to the JSON Schema specification, additionalProperties should default to true, but the library treats it as false. Look for where additionalProperties is implicitly set to false, possibly in the schema parsing or rendering logic. Consider changing the default to true while ensuring backward compatibility or making it configurable.