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API Linting

API Linting is a topic index for the tools, rulesets, vocabularies, and practices that automate API style guide enforcement across OpenAPI, AsyncAPI, JSON Schema, and adjacent contract formats. The collection catalogs the major open-source and commercial linters in use across the industry — Spectral, Vacuum, Redocly CLI, Optic, Apicurio, sweater-comb, Speakeasy, and Postman API governance — alongside shared schemas, JSON-LD context, and a working vocabulary so linting concepts can be reasoned about consistently across tools.

33 related providers on APIs.io 10 resources Source repository →

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Providers working in API Linting

Providers whose own tags share at least two of this topic's tags, most shared first — the top 30 of 33.

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Spectral Spectral is an open-source API style guide enforcer and linter from Stoplight, providing a flexible JSON/YAML linting engine with built-in support for OpenAPI (v3.1, v3.0, v2.0), Arazzo v1.0, and AsyncAPI v2.x. Teams use Spectral to define… emerging 1
Spotlight Rules Spotlight Rules is an openly-governed build of the Spectral API linter and, more importantly, the first attempt to publish the Spectral ruleset format as a standalone specification with its own portable JSON Schema — so that an organizatio… emerging 0
Stoplight Stoplight is a collaborative, design-first API platform providing a visual editor for OpenAPI specifications, interactive hosted documentation, automatic mock servers, API style guides and governance, and open-source tools including Prism… exemplar 2
SpecLynx SpecLynx provides enterprise-ready API tooling for authors and maintainers of OpenAPI, AsyncAPI, and Arazzo specifications. Built by veterans with 15+ years of Swagger and OpenAPI development experience, SpecLynx products prioritize securi… emerging 6
Postman Postman is the world's leading API platform, used by 35+ million developers to design, build, test, document, mock, monitor, and govern APIs across the entire API lifecycle. The platform spans Collections, Workspaces, the API Client, Spec… exemplar 21
Bump.sh Bump.sh is "the modern API doc platform" — automatic, diff-aware documentation for OpenAPI and AsyncAPI specifications, plus a managed Model Context Protocol (MCP) platform that compiles Flower or Arazzo workflow documents into determinist… developing 1
Zally Zally is an open source API linter from Zalando that validates OpenAPI 2 and 3 specifications against configurable rule sets for API design consistency. It exposes a REST API, command-line interface, and web UI for checking API designs aga… developing 1
Ogen Ogen is an Apache-2.0 OpenAPI v3 code generator for Go, maintained by the ogen-go organization. It reads an OpenAPI v3 document at build time and emits a statically typed Go client and server: code-generated JSON encoding with no reflectio… thin 1
Apicurio Apicurio is an open source API and schema tooling platform maintained by Red Hat under the Apache 2.0 license. It includes Apicurio Registry (a high-performance schema and API design registry), Apicurio Studio (a visual API designer for Op… thin 1
Vacuum Vacuum is the world's fastest and most versatile OpenAPI linter and toolkit, built in Go for validating and linting API specifications at scale. It is 100% compatible with Spectral rulesets and supports OpenAPI 3.0, 3.1, and 3.2. emerging 1
API Style Guides A landscape index of public API style guides published by leading technology companies and standards bodies. API style guides codify conventions for resource modeling, URI design, HTTP method use, status codes, error formats, pagination, v… emerging 11
Optic Optic is an MIT-licensed command-line tool for OpenAPI linting, diffing and testing. It compares two versions of an OpenAPI document with behaviour-aware diffing to catch breaking changes before they ship, enforces style-guide rulesets (br… emerging 1
Jargon Jargon is a platform for Domain Driven Design for APIs and Enterprise Data Modelling. It provides text-based modelling, template-based API design, real-time validation, version control with breaking change detection, and generation of arti… emerging 1
APIs.io APIs.io is an open-source API search engine and federated discovery network built on the APIs.json specification. It indexes API providers and their individual APIs across the public internet along with the machine-readable artifacts they… exemplar 20
Redocly Redocly is a company that specializes in API documentation and governance tooling. Their platform helps organizations create, manage, and publish API documentation through Realm (the integrated lifecycle platform that unifies Redoc, Revel,… exemplar 4
Routebase API lifecycle platform covering Design (visual OpenAPI editor), Mock (spec-driven mock servers), Test (suites, assertions, OWASP security scanning), Document (published docs portals), and Agents (MCP server), built around a single living O… strong 1
Observe.AI Observe.AI is an agentic AI platform for the contact center, providing purpose-built AI agents that handle customer support end-to-end across voice and chat, real-time AI Copilot guidance that assists frontline agents during live interacti… developing 1
SwaggerHub SwaggerHub is SmartBear's enterprise collaborative API design and documentation platform built around the OpenAPI specification. It provides tools for designing, building, documenting, and consuming RESTful APIs with support for OpenAPI 2.… developing 2
Elva API management platform for the agentic era: reads repos to build an API catalog, enforces per-audience contracts, generates tests, and turns APIs into governed, hosted MCP servers for AI agents. Built by Theneo. Exposes a public no-auth O… developing 1
BTC War Live Market Data API Public, keyless, read-only real-time crypto market-data API from btcwar.net, exposing live Binance Spot snapshots and single-market observations for nine USDT pairs as JSON and Schema.org JSON-LD. Every response carries provenance, a sourc… developing 3
Hey API Hey API builds open-source OpenAPI code generators and a hosted specification registry. @hey-api/openapi-ts turns an OpenAPI document into production-grade TypeScript — SDKs, types, Zod/Valibot/TypeBox validators, TanStack Query and SWR ho… developing 1
Naftiko Naftiko builds spec-driven integration software for AI agents. Its two Apache 2.0 Java engines — Ikanos, a capability engine, and Polychro, a polyglot spec linter — let a team declare a slice of its business in a single YAML capability fil… developing 0
Kiota Kiota is Microsoft's open source (MIT) API client generator: a command line tool that turns any OpenAPI-described API into a strongly-typed, lightweight client in C#, Dart, Go, Java, PHP, Python, Ruby or TypeScript. It exists to remove the… thin 1
API-Fiddle API-Fiddle is an interactive, collaborative API design platform for creating professional APIs based on OpenAPI. It provides first-class support for OpenAPI 3.x, data transfer objects, API versioning, suggested response codes, parameter se… thin 1
TypeSpec TypeSpec is an API description language developed by Microsoft for defining API shapes that compile to OpenAPI, JSON Schema, Protobuf, and other output formats. It provides a language and toolchain for describing REST APIs, gRPC services,… thin 6
Swagger Swagger is an open-source framework by SmartBear for designing, building, documenting, and consuming RESTful APIs using the OpenAPI Specification. Originally created by Wordnik in 2011, Swagger became the OpenAPI Specification (OAS) in 201… thin 5
Events Event-driven APIs catalog. Documents the landscape of brokers, streaming platforms, schema registries, and the specifications that standardize how events are described, transported, and stored. "Events" is the broader category that contain… thin 18
APIGovernance.Dev APIGovernance.Dev is an AI-powered API governance platform that enforces API best practices through automated reviews trained on 10,000 public APIs. It provides the API Governance Top-10 list of best practices, automated CI/CD integration,… thin 1
APIwiz APIwiz is a federated API management platform that streamlines the complete API lifecycle from design through monetization. The low-code platform provides centralized control for organizations managing APIs across multiple cloud environmen… emerging 1
NSwag NSwag is the Swagger/OpenAPI toolchain for .NET, ASP.NET Core and TypeScript, written in C# and maintained by Rico Suter under an MIT licence. It runs the contract in both directions: generating Swagger 2.0 and OpenAPI 3.0 documents from A… emerging 1

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API DesignAPI GovernanceAPI LintingAPI Style GuideAsyncAPIJSON SchemaLintingOpenAPIQuality AssuranceTopic