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A resource for common and standardised OpenAPI specification (vendor) extensions

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openapi-specification-extensions

A resource for common and standardised OpenAPI specification (vendor) extensions.

As well as a list of vendor-documented specification-extensions, this repository contains the results of two analyses of extensions, formats and $ref siblings used in real-world OpenAPI definitions, as at late March 2017 and April 2021.

See also this blog post.

Vendor-documented extensions

Analysis of specification-extensions

2021

Facet Analysis
Extensions 193953 definitions
Formats 193953 definitions
Ref Sibling 193953 definitions

2017

Analysis of extensions

Source Analysis
APIs.guru 391 definitions
GitHub 25136 definitions
Mermade 454 definitions
SOM Research HAPI 513 definitions
SwaggerHub 22872 definitions
Combined 49366 definitions

Analysis of formats

Source Analysis
APIs.guru 391 definitions
GitHub 25136 definitions
Mermade 454 definitions
SOM Research HAPI 513 definitions
SwaggerHub 22872 definitions
Combined 49366 definitions

Analysis of $refs with additional properties

Source Analysis
Combined 49366 definitions