OpenAPI Specification

The OpenAPI Specification (OAS), previously known as the Swagger Specification, is a specification for a programming language-agnostic, machine-readable interface definition language for describing, producing, consuming, and visualizing web services. OpenAPI documents describe API services and are represented in YAML or JSON formats.

GitHub: https://github.com/topics/openapi
Wikipedia: https://en.wikipedia.org/wiki/OpenAPI_Specification
Repo: https://github.com/OAI/OpenAPI-Specification
Created by: OpenAPI Initiative, Tony Tam, Darrel Miller, Mike Ralphson, Ron Ratovsky, Uri Sarid, Jason Harmon
Released: August 10, 2011
Related Topics: json-schema, raml, rest-api,
Aliases: open-api, swagger-spec, swagger-specification, openapi-spec, openapi-specification, open-api-specification, oas, openapi-description,
Last updated: 2026-01-22 00:18:40 UTC
JSON Representation

https://github.com/jinzcdev/oneapi-backend

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https://github.com/litestar-org/litestar-django

Django model support for Litestar.

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https://github.com/slinkyproject/slurm-client

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Automatically generate OpenAPI specifications from Typescript types.

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The connector framework maps cloud APIs to local APIs based on simple configurations and flexible extension mechanisms. You can subscribe to the distribution of cloud messages as local events. You can put all the focus on business logic without taking care of server-side programming nor relational databases. The OpenAPI or message subscription process is simplified, so you can focus on service logic and promote development efficiency.

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Asserting data against OpenAPI docs.

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IDL: Inter-parameter Dependency Language

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Asserts your responses against Swagger/OpenApi docs. Useful for API testing.

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The Openapi-HyperMedia format (OHM), is a format used to describe REST level 3 APIs.

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https://github.com/asfand-dev/api-html

Convert any API Specification into an awesome HTML documentation website

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Create web-APIs for long-running tasks. Job based task handling. Get the result with the job id later. FastTaskAPI creates threaded jobs and job queues on the fly. Router functionality for Runpod. Run services anywhere, be it local, hosted or serverless.

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https://github.com/thanhdaon/clean-arch-go

Clean Architecture, DDD, CQRS with testings in Go

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Open API to/fro routes, models, and tests. Convert between docstrings, classes, methods, argparse, SQLalchemy, Pydantic, JSON-schema.

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A FAST C++ library to validate the HTTP requests against the OpenAPI specifications of the REST server.

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OpenAPI/Swagger specification for Yodlee APIs

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https://github.com/sheriffmoose/storybook-extras

Storybook Extras Addons

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All of the open projects occurring within the Open API Initiative (OAI) community.

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Using MCP is fun with Cyberbro!

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Query REST APIs using Microsoft Excel User Defined Functions, VBA or Python functions

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https://github.com/saasify-sh/simple-cron

Dead simple cron service for making HTTP calls on a regular schedule.

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NestJS with OpenApi Swagger documentation

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Golang Web Service Example using Databento and DuckDB

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https://github.com/alekshura/sourceapi

API first Open API code generator based on json or yaml definitions.

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https://github.com/bang-olufsen/mozart-open-api

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https://github.com/pointnet/redoc-editor

Edit and share ReDoc settings/theme

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Type-safe REST-focused HTTP client for Rust - via the OpenAPI Specification

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https://github.com/etienne-bechara/crux

Node.js backend package including: framework (NestJS), HTTP server (Fastify), HTTP client (Fetch), distributed caching (ioredis), ORM (MikroORM), swagger documentation (Redoc), logger (Loki), metrics (Prometheus) and tracing (Tempo with OpenTelemetry).

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