Add the source content
Paste code or technical input, upload a supported JSON and YAML file, or load the working example. Check headers, delimiters, syntax, or line structure before processing.
Developer tools
OpenAPI Validator
Result
The result will appear here after you run the tool.
The result will appear here after you run the tool.
The result will appear here after you run the tool.
Press Ctrl or Command and Enter to run the tool.
About this tool
About this tool
OpenAPI Validator checks an OpenAPI definition for required version, info object, and paths structure by parsing YAML or JSON in your browser. Validation errors point to locations needing correction before tooling integration.
Validate OpenAPI JSON or YAML structure and inspect endpoints. Use the full-width workspace to validate content while reviewing syntax, encodings, protocol fields, and implementation details. The tool accepts JSON and YAML, provides focused options, and creates REPORT output that you can inspect, copy, download, or save as a local draft.
Built for daily work
- Use OpenAPI Validator for debugging, API development, configuration, testing, and deployment.
- Check structure and report issues against the supported rules before content is imported, published, committed, shared, or passed to another application.
- Check a small sample interactively before applying the same operation to a larger code or technical input workflow.
- Prepare cleaner REPORT output for teammates, clients, documentation, testing, or downstream automation.
How to use this tool
How to use this tool
Configure the operation
Review the available processing controls. The selected controls determine how the OpenAPI Validator interprets the source and builds the result.
Run the tool
Start the OpenAPI Validator and review the result, visual preview, and technical report. Correct any reported issue and run the tool again when necessary.
Export or continue the workflow
Copy or download the REPORT result, save a browser-local draft, or open a related tool for the next conversion, validation, or cleanup step.
Key features
Key features
Validate OpenAPI structure and required fields
Check that the submitted document includes the required openapi version, info object, and paths or components sections that every valid OpenAPI specification must contain.
Endpoint and operation inspection
List all paths and HTTP methods defined in the specification, showing which endpoints are documented and whether any path objects are empty.
Schema type and reference checking
Verify that $ref pointers reference components that actually exist in the document and that schema types match the expected OpenAPI format.
Validation report with line positions
Issues are reported with the path to the offending field and a description of the problem, making it straightforward to locate and fix errors.
Practical use cases
Practical use cases
- Use OpenAPI Validator for debugging, API development, configuration, testing, and deployment.
- Check structure and report issues against the supported rules before content is imported, published, committed, shared, or passed to another application.
- Check a small sample interactively before applying the same operation to a larger code or technical input workflow.
- Prepare cleaner REPORT output for teammates, clients, documentation, testing, or downstream automation.
- Keep repeat work in one browser workspace and continue directly into related formatting, validation, comparison, or conversion tools.
Private by default
For local tools, input is processed in your browser and is not sent to application analytics.
Data processing noticeTechnical details
Technical details
Input formatsJSON and YAML
Output formatsREPORT
ProcessingLocal browser processing
Task controlsthe available processing controls
Maximum local file25 MB per supported file
Workspace featuresFocus mode, examples, copy, download, local drafts, and result reports
Limitations and important notes
Limitations and important notes
- A successful validation covers the implemented standard and does not replace application-specific testing.
- Large or deeply structured input depends on available browser memory and may process more slowly on mobile devices.
- The tool implements practical browser-based processing and may not reproduce every feature of specialist desktop software or every vendor-specific extension.
- Keep the original source and review generated output before production, security-sensitive, financial, legal, or safety-critical use.
Frequently asked questions
Frequently asked questions
Validate OpenAPI JSON or YAML structure and inspect endpoints. It is built to validate content and present the result in a workspace that supports review, copying, downloading, and local drafts.
The current tool accepts JSON and YAML. Use the upload control for supported files or paste content directly into the editor.
The standard operation runs locally in your browser. Input and file contents are not sent to site analytics or stored on the server.
You can copy or download the processed REPORT result. Available output depends on the task and selected options.
A successful validation covers the implemented standard and does not replace application-specific testing. Always test important output in the application or workflow where it will be used.
Related guides and solutions
Related guides and solutions
How to inspect a JSON API response before integration
A structured API response review process for developers, QA teams, technical writers, and integration engineers.
Learn moreHow to format and validate JSON correctly
A practical guide to indentation, syntax validation, key order, parser errors, and safe output review.
Learn moreJSON syntax and data type reference
A compact technical reference for writing and validating strict JSON that can be opened in standards-compliant parsers.
Learn moreRelated tools
Related tools
Developer tools
HTTP Header Analyzer
Inspect pasted HTTP headers for security, caching, and content signals.
Open toolDeveloper tools
CORS Header Analyzer
Review CORS response headers and highlight risky configurations.
Open toolDeveloper tools
GraphQL Formatter
Format GraphQL queries, mutations, fragments, and variables.
Open tool