Find and replace should solve this one rather quickly. This follows the keyword independence concept, where keywords should only add constraints, but adding one more keyword should not remove a constraint. In order to achieve the goal of letting JSON Schema tools understand OpenAPI, it was decided to remove nullable entirely instead of deprecate it. This is useful new functionality, but has also made nullable redundant.
In line with JSON Schema, the `type` keyword can now define multiple types for a schema with an array. Schema Object Changes Swap nullable for type arrays
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We don’t need to learn every new thing JSON Schema can do right now, but if we’re going to upgrade we will need to know what to change in our OpenAPI documents. Supporting modern JSON Schema brings lots of handy new functionality, including being able to use items arrays for tuples, or the if/then/else keywords as an alternative to awkward nested allOf > oneOf chains some folks were using for more dynamic payloads. This should be the last one for a while and no major changes are planned by the JSON Schema crew, so if all goes well a final release is on the horizon, to avoid any further discrepancies. Now thanks to feedback gathered from users and tooling maintainers during the v3.1.0 release candidates, one more small draft was released: Draft 2020-12. OpenAPI v3.0 was based on JSON Schema Draft 05, and JSON Schema has gone through a few drafts since then: Draft 06, Draft 07, and Draft 2019-09. To resolve the subset superset problem, contributors from both communities came together, and got these two specifications aligned. This has caused confusion for some folks in the OpenAPI community. This has always been loosely based on JSON Schema, and referred to as a “subset superset” because it adds some things, and removes some other things from JSON Schema. OpenAPI Schema is now valid JSON SchemaĮverything inside the `schema` keyword in OpenAPI is defined by the Schema Object.
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Thankfully the scope of the breaking changes is incredibly small, limited to the Schema Object, and achieves a much greater goal: full compatibility with modern JSON Schema. In a perfect world this would be all you need to do, but despite the minor version number, v3.1 does have some small breaking changes. If instead of `openapi: 3.0.3` you see `swagger: 2.0` then see if swagger2openapi can help you upgrade to v3.0 before continuing. If you’re ready to give it a try, let’s take a look at the changes you may, or may not, need to make in order to get onto OpenAPI v3.1.įirst things first, let’s change that version number! Open up your OpenAPI JSON or YAML file, and look for this line: openapi: 3.0.3 OpenAPI v3.1 brings a lot of great new functionality and improvements, and at some point in the near future you might find yourself wanting to upgrade. If you’d like to donate to Phil’s charity of choice, please see Protect Earth which is reforesting the U.K. This post is authored by Phil Sturgeon, product manager, Stoplight, and Chairperson, Protect Earth.
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