OpenAPI Validator

Validate OpenAPI 3.0 and 3.1 YAML or JSON in your browser. Check required fields, paths, operations, responses, schemas, and SDK-readiness signals.

Reviewed May 25, 2026. Privacy model: tool input is processed in your browser and is not uploaded to BytePane servers.

OpenAPI YAML or JSON

openapi: 3.1.0
info:
  title: Orders API
  version: 1.0.0
servers:
  - url: https://api.example.com
paths:
  /orders:
    get:
      summary: List orders
      operationId: listOrders
      responses:
        '200':
          description: Orders returned successfully
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Order'
    post:
      summary: Create an order
      operationId: createOrder
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/NewOrder'
      responses:
        '201':
          description: Order created
components:
  schemas:
    Order:
      type: object
      required: [id, total]
      properties:
        id:
          type: string
        total:
          type: number
    NewOrder:
      type: object
      required: [total]
      properties:
        total:
          type: number

Validation Report

OpenAPI validation report for Orders API
Version: 3.1.0
Paths: 1
Operations: 2
Schemas: 2
Parameters: 0
Response codes: 2
Errors: 0
Warnings: 0

No structural issues found by this lightweight OpenAPI check.

Paths

Operations

Schemas

Errors

Warnings

What this OpenAPI check catches

A broken OpenAPI contract can damage documentation, SDK generation, AI coding assistant examples, API gateways, and internal integration tests. This validator checks the high-signal structure first: OpenAPI version, info metadata, server visibility, paths, operations, response objects, operationId coverage, summaries, response descriptions, and reusable schemas.

OpenAPI validation workflow

Start here for a fast browser-side pass, then run a stricter linter in CI. Good API contracts should have stable operationIds, accurate examples, explicit response codes, schemas that match real payloads, and descriptions that a developer or AI assistant can quote without guessing.

Frequently Asked Questions

Does this replace official OpenAPI tooling?

No. This is a fast browser-side structural validator for early checks. Use Spectral, Redocly, Swagger Editor, or your API gateway validation before publishing production contracts.

Can it validate YAML and JSON?

Yes. Paste OpenAPI YAML or JSON. The parser accepts common YAML documents and JSON objects, then checks OpenAPI-specific structure.

Is my API spec uploaded?

No. Parsing and validation run client-side in your browser. Avoid pasting private production secrets into any web tool.

OpenAPI Validator

What this OpenAPI check catches

OpenAPI validation workflow

Frequently Asked Questions

Does this replace official OpenAPI tooling?

Can it validate YAML and JSON?

Is my API spec uploaded?

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