API & OpenAPI utility

OpenAPI Operation ID Checker

Find missing or duplicate operationId values across OpenAPI paths.

● 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 Operation ID Checker

Paste an OpenAPI specification with path operations.
Select Check Operation IDs to find missing or duplicate identifiers.
Update operationId values in your source specification as needed.

Example

Input:

openapi: 3.0.3
info:
  title: Example API
  version: 1.0.0
paths:
  /users:
    get:
      operationId: listUsers
      responses:
        '200':
          description: OK
  /teams:
    get:
      operationId: listUsers
      responses:
        '200':
          description: OK

Output:

Duplicate operationId listUsers: GET /users, GET /teams

Use cases

Prepare stable identifiers for generated SDKs.
Find accidental duplicate operation IDs.
Check operations before client generation.

About this tool

Find missing or duplicate operationId values across OpenAPI paths. Processing happens locally in your browser, so your input is not sent to a server or included in analytics.

Frequently asked questions

Are operation IDs required by OpenAPI?

They are optional in the specification but useful for generated client method names.