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William Cheng
Varg Industries
Is there any way to configure the generator with a maximum line length so that it doesn't generate really long lines?
William Cheng
Hi. We still use python2 in our legacy environment. Is it possible to generate openAPI code through openapi-generator-cli for python version 2.7?
William Cheng
Christoph, René Pardon
is there a way to generate an open api spec from a rest api just by calling all the endpoints through a script? ;D
problem is: its a huge api and documenting all endpoints manually would consume a lot of time
Stefan Dresselhaus
@renepardon Some APIs are self-documenting via https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/OPTIONS ;)
@renepardon activate swagger in your services -> convert the ouput of the swagger definition to openapi
William Cheng

Hi All,

I have a question on OpenAPI generator for spring, currently i have base class and number of subclass
so would like generate the code something like this

public ResponseEntity<T extnds Base> methodName()

When i used oneOf its generates
public ResponseEntity<Object> methodName()

Is there anyway to generate public ResponseEntity<T extnds Base> methodName() in this format


Please join our Slack channel via https://join.slack.com/t/openapi-generator/shared_invite/enQtNzAyNDMyOTU0OTE1LTY5ZDBiNDI5NzI5ZjQ1Y2E5OWVjMjZkYzY1ZGM2MWQ4YWFjMzcyNDY5MGI4NjQxNDBiMTlmZTc5NjY2ZTQ5MGM and we'll only answer questions in the Slack channels moving forward.

@nbenjamin This gitter is no longer active and maintained. It's only here for the purpose of redirecting people to slack

Thank you @Fjolnir-Dvorak
Geoff Brown

So I'm running into some issues with an OpenAPI 3 spec and the CSharp generator. If I have query parameters that are optional, they always generate to non-optional on the api client:

ie.{ "name": "categoryId", "in": "query", "schema": { "type": "integer", "format": "int64" } }

comes out as long categoryId = default(long)

I tried messing with the template, but I can't figure out how to make it distinguish the difference. I'm starting to think that the actual code is incorrect and the dataType here should be long? instead of long, which would make things work properly. Anyone know where I would look for that? Is there something else in the template I could be doing?

Stefan Dresselhaus

Please join our Slack channel via https://join.slack.com/t/openapi-generator/shared_invite/enQtNzAyNDMyOTU0OTE1LTY5ZDBiNDI5NzI5ZjQ1Y2E5OWVjMjZkYzY1ZGM2MWQ4YWFjMzcyNDY5MGI4NjQxNDBiMTlmZTc5NjY2ZTQ5MGM and we'll only answer questions in the Slack channels moving forward.

@gbrown-ce This gitter is no longer active and maintained. It's only here for the purpose of redirecting people to slack

but to answer your question: try required: true/false to denote optional fields
(i don't use C#, but in Haskell you have to make everything required, otherwise it will always be optional)
Geoff Brown
This is working the opposite way (everything is required). I think I might have found a way with the netcore generator. Thanks for the heads up about the slack!
i have a kinda general question: the openapi-generator to c# is working, right? There are no breaking issues at the moment?
John Kida
Im using openapi-generator for a java/spring project. Its currently generating the server stub with a query param of Map<String, Object> however i need it to generate as a MultiValueMap to support ?id=1&id=2.
What is the correct approach to make sure it generates the stub with the correct class to support this?
hello there
i have an openapi specification split into multiple yaml and json files
swagger-parser-v3 can resolve all reference and combine it into a single model - in memory
now, can I somehow write that model into a new yaml file?
is there some tool that can be used to merge multiple openapi spec files into one?
I just had a brief look into the code generator if it is feasible to integrate it into an API first development process. It does its job to generate a stub but I wonder if anybody integrated it into an automated build. My idea was to edit the yaml file and get the server generated, to a certain degree, e.g. controller level. Has anybody experience with such a setup. Currently it looks like a one shot generator.
Stefan Dresselhaus
@1pinus we use the haskell & python-generator for such things.
@Drezil How do you merge the generated code with the already available? Copy files?
Stefan Dresselhaus
generated code is in a seperate git-submodule. Git pull then does the trick.
and you never need to merge as generated code never gets touched by hand
William Cheng
Is there a way to modify the generated Avro Schema ? Basically any data attribute defined with format: date-time should be tagged with a logical type
Philippe Soares
Hi ! I'm trying to generate a java client from https://api.twitter.com/2/openapi.json, but the generator creates an interface with an invalid name "2Api.java". Is there a way to set a prefix to the interface name the same way we add prefixes to the model classes?
Jonas Jermann
hi, I have this issue: OpenAPITools/openapi-generator#2892
Is anyone familiar how I can force "separate" schema definitions for everything (which seems to be a temporary fix for the above bug)? I use swashbuckle for the opnapi.json generation.
Khairi Husseini
hey everyone. does anyone know how I implement the generated client for typescript-rxjs? I used the typescript generator first in my redux application, however since the models are declared as classes this didn't really work nicely together with the redux store. I never used rxjs and I cannot find any documentation on how to use the client.
Hello everyone. I'm looking for tool that can generate api docs directly from source code, does anyone know if openapi-generator allows to do that?
I have springboot project that currently creates api.json file using swagger-core, but it requires to run the app first. I want to avoid that step
Does anybody know how I can download binary data with a generated client? My problem is that the data is interpreted as JSON which is why the client crashes.
Also: I am using StreamingResponseBody (Spring Boot)
Rakesh Bairi

We have been trying to achieve configuring Swagger on Aspnet Core Identity Server 4 Application, we have added Custom End points to ID4 refered from link.

Swagger Configuration:

Code added on Startup.cs > ConfigureServices(IServiceCollection services)

services.AddSwaggerGen(c =>
c.SwaggerDoc("v1", new OpenApiInfo { Title = "Identity Server Application", Version = "v1" });
Code added on Startup.cs > Configure(IApplicationBuilder app)

  // Enable middleware to serve generated Swagger as a JSON endpoint.
    // Enable middleware to serve swagger-ui (HTML, JS, CSS, etc.),
    // specifying the Swagger JSON endpoint.
    app.UseSwaggerUI(c =>
        c.SwaggerEndpoint("/swagger/v1/swagger.json", "Identity Server Application");

When i run application swagger/index.html only showing Custom Added End Points,its not showing Identity Server Endpoints like {connect/authorize,connect/token,connect/userinfo etc.}

Can any one please give me right direction to achieve above functionality.

swagger reponse coming in OpenApi format
Joseph Chambers
is there a option to generate a single instance because the openapi-generator to creates a new instance for each service.

an example:

const userApi = new UserApi(new Configuration({ baseOptions: {…} }), BASE_URL, axiosInstance);

Joseph Chambers
is there a way so I don't need to create a new instance for the UserApi, ReactionsApi, etc etc?
Joseph Chambers
I should say when I have multiple tags.
Ben Gill
Hey, we are using 5.0.0.SNAPSHOT, and seeing this behaviour on typescript-angular generator: Property 'toISOString' does not exist on type 'string'.
309         return this.httpClient.get<LoadHolidayResponse>(`${this.configuration.basePath}/rest/holidays/loadBetween/${encodeURIComponent(String(contextId))}/${encodeURIComponent(String(contextIdType))}/${encodeURIComponent(String(start.toISOString()))}/${encodeURIComponent(String(end.toISOString()))}`,