Can not generate nodejs-server with openapi-generator - node.js

Question

How can I generate nodejs-server with OAS 2.0 as input with openapi-generator?
openapi-generator runs on two versions 3.3.4 and 4.0.0.
The results of my execution are listed below.
■in 3.3.4
java -jar openapi-generator-cli-3.3.4.jar generate -i petstore.json -g nodejs-server -o stub
[main] WARN o.o.c.ignore.CodegenIgnoreProcessor - Output directory does not exist, or is inaccessible. No file (.openapi-generator-ignore) will be evaluated.
[main] WARN o.o.c.languages.NodeJSServerCodegen -
=======================================================================================
Currently, Node.js server doesn't work as its dependency doesn't support OpenAPI Spec3.
For further details, see https://github.com/OpenAPITools/openapi-generator/issues/34
=======================================================================================
[main] INFO o.o.codegen.DefaultGenerator - Model Pets not generated since it's an alias to array (without property)
Exception in thread "main" java.lang.RuntimeException: Could not generate api file for 'Pets'
at org.openapitools.codegen.DefaultGenerator.generateApis(DefaultGenerator.java:651)
at org.openapitools.codegen.DefaultGenerator.generate(DefaultGenerator.java:891)
at org.openapitools.codegen.cmd.Generate.run(Generate.java:355)
at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:62)
Caused by: java.lang.IllegalArgumentException: character to be escaped is missing
at java.util.regex.Matcher.appendReplacement(Matcher.java:809)
at java.util.regex.Matcher.replaceAll(Matcher.java:955)
at java.lang.String.replaceAll(String.java:2223)
at org.openapitools.codegen.languages.NodeJSServerCodegen.apiFilename(NodeJSServerCodegen.java:192)
at org.openapitools.codegen.DefaultGenerator.generateApis(DefaultGenerator.java:595)
... 3 more
■in 4.0.0
java -jar openapi-generator-cli-4.0.0.jar generate -i petstore.json -g nodejs-server -o stub
[main] WARN o.o.c.ignore.CodegenIgnoreProcessor - Output directory does not exist, or is inaccessible. No file (.openapi-generator-ignore) will be evaluated.
[main] INFO o.o.codegen.DefaultGenerator - OpenAPI Generator: nodejs-server (server)
[main] INFO o.o.codegen.DefaultGenerator - Generator 'nodejs-server' is considered stable.
[main] WARN o.o.c.languages.NodeJSServerCodegen -
=======================================================================================
Currently, Node.js server doesn't work as its dependency doesn't support OpenAPI Spec3.
For further details, see https://github.com/OpenAPITools/openapi-generator/issues/34
=======================================================================================
[main] INFO o.o.codegen.DefaultGenerator - Model Pets not generated since it's an alias to array (without property) and `generateAliasAsModel` is set to false (default)
Exception in thread "main" java.lang.RuntimeException: Could not generate api file for 'Pets'
at org.openapitools.codegen.DefaultGenerator.generateApis(DefaultGenerator.java:666)
at org.openapitools.codegen.DefaultGenerator.generate(DefaultGenerator.java:922)
at org.openapitools.codegen.cmd.Generate.run(Generate.java:396)
at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:60)
Caused by: java.lang.IllegalArgumentException: character to be escaped is missing
at java.util.regex.Matcher.appendReplacement(Matcher.java:809)
at java.util.regex.Matcher.replaceAll(Matcher.java:955)
at java.lang.String.replaceAll(String.java:2223)
at org.openapitools.codegen.languages.NodeJSServerCodegen.apiFilename(NodeJSServerCodegen.java:181)
at org.openapitools.codegen.DefaultGenerator.generateApis(DefaultGenerator.java:611)
... 3 more
The input OAS uses the following.
https://raw.githubusercontent.com/OAI/OpenAPI-Specification/master/examples/v2.0/json/petstore.json
The execution environment is as follows.
・windows10
・java 1.8.0_202

Answer 1

It works for me:
java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate -g nodejs-server -i https://raw.githubusercontent.com/OAI/OpenAPI-Specification/master/examples/v2.0/json/petstore.json -o /tmp/nodejs-server
[main] INFO o.o.codegen.DefaultGenerator - OpenAPI Generator: nodejs-server (server)
[main] INFO o.o.codegen.DefaultGenerator - Generator 'nodejs-server' is considered stable.
[main] WARN o.o.c.languages.NodeJSServerCodegen -
=======================================================================================
Currently, Node.js server doesn't work as its dependency doesn't support OpenAPI Spec3.
For further details, see https://github.com/OpenAPITools/openapi-generator/issues/34
=======================================================================================
[main] INFO o.o.codegen.DefaultCodegen - Skipped overwriting README.md as the file already exists in /tmp/java2//README.md
[main] INFO o.o.codegen.DefaultGenerator - Model Pets not generated since it's an alias to array (without property) and `generateAliasAsModel` is set to false (default)
[main] INFO o.o.codegen.AbstractGenerator - writing file /tmp/java2/service/PetsService.js
[main] INFO o.o.codegen.AbstractGenerator - writing file /tmp/java2/controllers/Pets.js
[main] INFO o.o.codegen.AbstractGenerator - writing file /tmp/java2/utils/writer.js
[main] INFO o.o.codegen.AbstractGenerator - writing file /tmp/java2/api/openapi.yaml
[main] INFO o.o.codegen.AbstractGenerator - writing file /tmp/java2/index.js
[main] INFO o.o.codegen.AbstractGenerator - writing file /tmp/java2/package.json
[main] INFO o.o.codegen.AbstractGenerator - writing file /tmp/java2/.openapi-generator/VERSION
But as mentioned in the warning, the nodejs-server generator no longer works as expected as one of its dependencies does not support OpenAPI spec v3.
Please refer to https://github.com/OpenAPITools/openapi-generator/issues/2828 for the latest development of creating a new NodeJS Express generator.
UPDATE (2019/09): we've added a new nodejs-express-server generator. Please refer to https://twitter.com/oas_generator/status/1160000504455319553 for more information.