API & OpenAPI utility

OpenAPI Parameter Viewer

List path and operation parameters with location, required state, and basic type.

● This tool runs entirely in your browser. Your input is never uploaded to our servers.

OpenAPI YAML or JSON

Output

Your result will appear here…

How to use OpenAPI Parameter Viewer

Paste an OpenAPI document containing path operations.
Select List Parameters to view each inline parameter.
Review unresolved $ref entries in the original specification.

Example

Input:

openapi: 3.0.3
info:
  title: Example API
  version: 1.0.0
paths:
  /users/{userId}:
    parameters:
      - name: userId
        in: path
        required: true
        schema:
          type: string
    get:
      parameters:
        - name: limit
          in: query
          schema:
            type: integer
      responses:
        '200':
          description: OK

Output:

GET /users/{userId} — path userId (required): string
GET /users/{userId} — query limit (optional): integer

Use cases

Inventory query and path parameters.
Review required inputs before implementing a client.
Inspect parameter locations across operations.

About this tool

List path and operation parameters with location, required state, and basic type. Processing happens locally in your browser, so your input is not sent to a server or included in analytics.

Frequently asked questions

Are reusable parameter references resolved?

No. This view lists their $ref pointer so you can inspect the component definition separately.