[BUG] [nodejs-express-server] Bug Generating Service with SnakeCase Parameters

Bug Report Checklist

[x ] Have you provided a full/minimal spec to reproduce the issue?
[x ] Have you validated the input using an OpenAPI validator (example)?
[x ] Have you tested with the latest master to confirm the issue still exists?
[ x] Have you searched for related issues/PRs?
[x ] What's the actual output vs expected output?
[ ] [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

When generating a service, nodejs-express-server incorrectly names properties that have underscores in the name.

Expected: userId Actual: userUnderscoreid

openapi-generator version

5.4.0

OpenAPI declaration file content or url


openapi: 3.0.3
info:
  description: Service
  title: Service
  version: "1.0"
servers:
- description: dev server
  url: http://localhost:8080
security:
- bearerAuth: []
paths:
  /v1/users/{user_id}:
    delete:
      operationId: deleteUser
      parameters:
      - description: Identifier of user to delete
        in: path
        name: user_id
        required: true
        schema:
          type: string
      responses:
        "200":
          content: {}
          description: Delete result

Generation Details

openapi-generator generate -i api-spec.yaml --package-name service -g nodejs-express-server -o ~/workplace/service

UsersService.ts

/**
* Delete a user
*
* userUnderscoreid String Identifier of user to return
* no response value expected for this operation
* */
const deleteUser = ({ userUnderscoreid }) => new Promise(
  async (resolve, reject) => {
    try {
      resolve(Service.successResponse({
        userUnderscoreid,
      }));
    } catch (e) {
      reject(Service.rejectResponse(
        e.message || 'Invalid input',
        e.status || 405,
      ));
    }
  },
);

Steps to reproduce

See above

Related issues/PRs

N/A

Suggest a fix

Utilize camelize when creating property names.

The root cause appears to be here, where underscore is not included in the pattern, where it is in the normal default.: https://github.com/OpenAPITools/openapi-generator/blob/b6a8037f62a5e4244236b65518c9f5e6fd02f27e/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/NodeJSExpressServerCodegen.java#L414

https://github.com/OpenAPITools/openapi-generator/blob/b6a8037f62a5e4244236b65518c9f5e6fd02f27e/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java#L5359

Which then causes underscore to be renamed by special characters in this block here: https://github.com/OpenAPITools/openapi-generator/blob/b6a8037f62a5e4244236b65518c9f5e6fd02f27e/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java#L1484

OpenAPITools / openapi-generator

[BUG] [nodejs-express-server] Bug Generating Service with SnakeCase Parameters #12259