How to use OpenAPI Validator & Normalizer

Validate an OpenAPI JSON or YAML document and normalize its key ordering and output syntax.

1. Paste, type, or drag and drop a supported text file into the input area.
2. Choose the options that match your intended result.
3. Select “Run tool” or press Ctrl/Command + Enter, then copy, download, or move the result back into the first input for another pass.

What the result means

A normalized OpenAPI document plus version, path, operation, and schema counts.

Privacy and safety

This utility is loaded as browser code and processes your input only in this tab. OmniCastConverter has no upload endpoint and never stores your content, filenames, tokens, or secrets. Generated markup and code are shown as inert text and are never executed.

Limitations

• This performs structural validation and normalization, not full JSON Schema validation or remote $ref resolution.

Try the included example

Select “Load example” at any time to restore this tested sample.

openapi: 3.1.0
info:
  title: Local API
  version: 1.0.0
paths:
  /health:
    get:
      responses:
        "200":
          description: Healthy