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Allow failing on duplicate keys

See original GitHub issue

WHY

The JSON format allows for duplicate keys in objects:

{'a': 2, 'a': 4}

but the spec says it “SHOULD” not be done.

Different parsers implement it differently. It would by nice to configure the Json parses to fail on duplicate keys

HOW

Allow a setting on Json to fail on duplicate keys:

val json = kotlinx.serialization.json.Json {
        ignoreDuplicateKeys = false (default should be true
    }
``

Issue Analytics

State:
Created a year ago
Reactions:2
Comments:9 (4 by maintainers)

Top GitHub Comments

1reaction

qwwdfsadcommented, Oct 8, 2022

I honestly was sure that we do fail on duplicate keys and that the request was about allowing duplicate keys, thus misreading the sentence.

The request indeed is reasonable and seems like it should be on by default, though it requires a proper damage assessment.

0reactions

Lysouncommented, Oct 27, 2022

That means that the only way to run the JVM tests is to set java 11 as default version on one’s computer, which can be pretty troublesome when it’s not.

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