API Validator
Browser-based API linting across OpenAPI, AsyncAPI, Arazzo, and JSON Schema.
At a glance
- Editor scoreNot yet scored
- PricingFree plan
- Best forDevelopers needing free multi-format API linting
- Free planYes
- Paid fromNone
- Style guide enforcementYes
- Facts checked20 Sep 2026
Where it wins
- Validates OpenAPI, Swagger, AsyncAPI, Arazzo, and JSON Schema
- Customizes Spectral rule severity, messages, and descriptions
- Searches GitHub, GitLab, and Bitbucket artifacts
Where it doesn't
- No verified CI/CD integration for automated pipeline checks
- Does not provide access controls or lifecycle governance controls
- Browser-first workflow may not suit teams needing centralized administration
Our verdict on API Validator
API Validator is a browser-first, open-source tool for developers who need to lint and validate API description documents across several formats. It supports OpenAPI 3.x, Swagger 2.0, AsyncAPI, Arazzo, and JSON Schema, with a free workflow that requires no account or backend. The tool runs its Spectral rules engine client-side, accepts uploads, and includes YAML and JSON editing through Monaco. It is suited to individual developers and teams that want portable API governance checks without adopting a hosted service.
Its strongest area is format coverage combined with editable governance rules. Users can adjust rule severity, messages, and descriptions, then generate API documentation or transform artifacts through bundling and componentization. GitHub, GitLab, and Bitbucket artifact search extend the browser workflow into repository-based review. Commit and pull-request workflows for Git repositories can also connect validation work with code changes, while offline single-file execution supports use without a backend connection. These capabilities make API Validator a focused option for teams standardizing descriptions and style-guide enforcement across different API formats.
The trade-off is governance depth beyond document validation. API Validator does not provide verified lifecycle controls, access controls, or CI/CD integration, so teams needing centralized permissions, automated pipeline enforcement, or broader API program administration should choose a platform that includes those controls. Teams that primarily need customizable linting, documentation generation, artifact transformations, and repository search should find its narrow focus appropriate. Developers who prefer an open-source tool they can fork and run locally will also benefit from its offline and client-side design.
API Validator pricing
API Validator fact sheet
| Free plan | Yes |
|---|---|
| Paid from | None |
| Style guide enforcement | Yes |
| API linting | Yes |
| Governed API formats | OpenAPI 3.x, Swagger 2.0, AsyncAPI, Arazzo, JSON Schema |
| Lifecycle controls | Not verified |
| Design review workflows | Not verified |
| CI/CD integration | No |
| Access control level | Not verified |
| Deployment | Cloud |
| Platforms | Web |
| Support | Community, Docs |
| Built for | Solo, Small business, Mid-market (editorial estimate) |
| Integrations | 3 integrations: GitHub, GitLab, Bitbucket |
| Pricing | Free plan |
| Website | validator.apicommons.org |
| Facts checked | 20 Sep 2026 |
API Validator integrations
API Validator lists 3 integrations on its own site.
- GitHub
- GitLab
- Bitbucket
Alternatives to API Validator
- Swagger StudioA broad governance workspace for teams managing APIs across formats and delivery workflows.—
- DigitalAPIA broad governance layer for enterprises standardizing APIs across distributed gateway environments.6.0
- Apigee API hubA free API catalog with strong Apigee and Google Cloud governance coverage.—
See all API Validator alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026
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