OpenAPI Viewer & Validator

Turn an API description file into readable docs, find mistakes in it, and get example requests to copy.

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Your inputs stay on your device and are not sent to our servers. Optional usage analytics does not receive your files or tool inputs.

OpenAPI Viewer & Validator

Browse, check and get example requests from an API file

OpenAPI or Swagger (JSON or YAML)

openapi: 3.0.3
info:
  title: Pet Store (sample)
  version: 1.0.0
  description: A tiny example API.
servers:
  - url: https://petstore.example.com/v1
security:
  - bearerAuth: []
paths:
  /pets:
    get:
      tags: [pets]
      operationId: listPets
      summary: List pets
      parameters:
        - name: limit
          in: query
          schema: { type: integer, format: int32 }
      responses:
        "200":
          description: A list of pets
          content:
            application/json:
              schema:
                type: array
                items: { $ref: "#/components/schemas/Pet" }
    post:
      tags: [pets]
      operationId: createPet
      summary: Add a pet
      requestBody:
        required: true
        content:
          application/json:
            schema: { $ref: "#/components/schemas/Pet" }
      responses:
        "201": { description: Created }
        default: { description: Error }
  /pets/{petId}:
    get:
      tags: [pets]
      operationId: getPet
      summary: Get one pet
      parameters:
        - name: petId
          in: path
          required: true
          schema: { type: integer, format: int64 }
      responses:
        "200":
          description: One pet
          content:
            application/json:
              schema: { $ref: "#/components/schemas/Pet" }
        "404": { description: Not found }
components:
  securitySchemes:
    bearerAuth: { type: http, scheme: bearer }
  schemas:
    Pet:
      type: object
      required: [name]
      properties:
        id: { type: integer, format: int64 }
        name: { type: string, example: Rex }
        tag: { type: string }

Docs

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How to use OpenAPI Viewer & Validator

Paste your OpenAPI or Swagger file (JSON or YAML), open a file, or start from the sample.
Pick Docs to read it, or Example requests to get curl or HTTP text. Filter by path, tag or name.
Read the checks for problems, then copy the text or download it.

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What are the limits of OpenAPI Viewer & Validator?

Checks the common mistakes (required fields, undeclared path parameters, duplicate operationIds, broken local $refs, bad response codes); it is not a full schema validator. Only local $refs are followed, nothing is fetched. Example requests are text for you to copy; this tool never sends them. Your file stays on your device.