JSON-101 unity data_error ai_generated true

JsonSerializationException: Invalid JSON input for type 'PlayerData'

ID: unity/script-invalid-json-serialization

Also available as: JSON · Markdown · 中文
88%Fix Rate
85%Confidence
1Evidence
2024-08-20First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
Unity 2021.3 active — — —
Unity 2022.3 active — — —
Unity 2023.1 active — — —

Root Cause

The JSON string passed to JsonUtility.FromJson does not match the expected structure of the target class.

generic

中文

传递给 JsonUtility.FromJson 的 JSON 字符串与目标类的预期结构不匹配。

Official Documentation

https://docs.unity3d.com/ScriptReference/JsonUtility.FromJson.html

Workarounds

  1. 90% success Validate the JSON string before deserialization using a JSON validator. Ensure fields match the class structure exactly (case-sensitive). 
    Validate the JSON string before deserialization using a JSON validator. Ensure fields match the class structure exactly (case-sensitive).
  2. 85% success Use the [Serializable] attribute on the target class and ensure all fields are public or have [SerializeField]. 
    Use the [Serializable] attribute on the target class and ensure all fields are public or have [SerializeField].

中文步骤

  1. 在反序列化之前使用 JSON 验证器验证 JSON 字符串。确保字段与类结构完全匹配（区分大小写）。
  2. 在目标类上使用 [Serializable] 属性，并确保所有字段都是公共的或具有 [SerializeField]。

Dead Ends

Common approaches that don't work:

  1. Wrap the JSON parsing in a try-catch block and ignore the exception. 70% fail

    Ignoring the exception leads to null data and potential runtime errors later.

  2. Use Newtonsoft.Json instead of JsonUtility without changing the input format. 50% fail

    If the JSON is malformed, Newtonsoft.Json will also fail or produce unexpected results.