JSON Schema - format property with JSON.Net

Question

We have a JSON schema with format property, snippet below:

"properties": {
        "expireDateTime": {
        "description": "Date when the time will expire.  If granularity is at the date level then YYYY-MM-DD is passed.  If the granularity is at the hour/minute level then the date time format is YYYY-MM-DDThh:mm:ss+-hh:mm",
        "type": "string",
        "format": [ "date-time", "date" ]
        } }

We are processing it using the Json.Net parser from NewtonSoft. This used to parse correctly with the previous version of the framework (v6.x), which only supported draft 3. With the latest version of the framework that supports draft 4, I get an error that format cannot be an array.

I looked around and did not see anything in the draft 3 spec that says that format can or cannot be an array. https://datatracker.ietf.org/doc/html/draft-zyp-json-schema-03#section-5.23

However, draft 4 clearly states that format must be a string. http://json-schema.org/latest/json-schema-validation.html#anchor79

Am I correct in assuming that the Json.Net framework is not backward compatible in this aspect? Or was the way it worked in the previous versions erroneous? It will help us handle the problem accordingly. Thanks.

do you have a missing closing curly brace?

h-rai
– h-rai

2015-02-18 00:00:58 +00:00
Commented Feb 18, 2015 at 0:00 — h-rai
– h-rai, Commented Feb 18, 2015 at 0:00

James Newton-King · Accepted Answer · 2015-02-19 01:55:35Z

1

In draft 3 the format property was intended as a string, not an array of strings.

answered Feb 19, 2015 at 1:55

James Newton-King

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3 Comments

Mahogany Over a year ago

Thanks James. So I suppose this was an oversight in the previous version of Json.Net.

James Newton-King Over a year ago

I'm not sure what you are referring to. Json.NET has always only supported "format" as a string.

Mahogany Over a year ago

The JSON snippet I have provided used to work though. I'm not sure why or how.

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