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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

• Adyen
• AIRR
• Alibaba Cloud API Gateway
• Amazon AWS
• api-ref-resolver
• Apiary
• Apigee-127
• APIMatic
• APIs.guru
• Bump.sh
• Bungie.net
• DocuSign
• EVRYTHNG
• Exegesis
• express-openapi
• Fern
• GitHub
• go-swagger
• Google Cloud Endpoints
• IBM API Connect
• IBM Watson Orchestrate
• Kusk
• Kusk Gateway
• Microsoft Azure
• Microsoft Connectors
• Microsoft Flow
• Microsoft Typespec (fka Cadl)
• Nintex Workflow Cloud
• NSwagStudio/NJsonSchema - documentation pending (x-typeName, x-enumNames)
• ReadMe.io
• Red Hat Fuse Online
• Redocly
• RepreZen Swagger-Normalizer
• Restish
• SAP OpenAPI Specification Extensions for the SAP Ecosystem
• Speakeasy
• Spring Cloud Contract OpenAPI 3.0 Converter
• SQL-Translator-Parser-OpenAPI
• Stoplight
• Stripe
• swagger-codegen
• SwaggerHub
• swaggerplusplus
• Twilio
• TypeForm OpenAPI-micro-merge
• Unisys COBOL
• Vert.x
• WaveMaker Studio (x-WM- extensions) - documentation pending
• WSO2 API Microgateway
• Yandex API Gateway
• Zuplo

Analysis of specification-extensions

2021

2017

Analysis of extensions

Analysis of formats

Analysis of $refs with additional properties