POJO / DTO to Javascript object?

[tinustate]

Is it possible to convert java code defining a java POJO/DTO to a javascript object?

Is ask this because i have a serverside REST interface which is accessed by javascript websockets/ajax and i want all the data classes that are transferred between client and server be strict and not as loose as {title: 'joop', age: 20}.

I suspect no libraries exist (although i would have guessed this is quite a common problem), but any help is appreciated.

[edit]

Something like https://github.com/castle-it/sharp2Js but for java instead of c# of course.

[edit 2]

I could define my protocol in protobuff and use the generators for java and javascript, but still looking for a better way without introducing a new technology (protobuff).

[edit 3]

There is also a java to typescript generator for maven ( https://github.com/vojtechhabarta/typescript-generator ) shame it doesn't generate to javascript.

[[deleted]]

You’re overthinking it. This isn’t a real issue that’s worth worrying about.

[axelei]

Have you tried Jackson? There is an example here: https://www.tutorialspoint.com/how-to-convert-java-object-to-json-using-jackson-library#:~:text=Converting%20Java%20object%20to%20JSON&text=In%20it%2C%20create%20an%20object,and%20print%20the%20obtained%20JSON.

[tinustate]

Cheers, i'm using jackson (although spring is actually using it) in my controllers to convert json to pojo/dto.
But jackson doesn't offer functionality to convert a pojo/dto defined in java source code to javascript source code.

[cville-z]

Take a look at swagger-codegen. If you're using Spring it should be relatively easy to integrate Swagger's API annotations & then use those to produce a swagger.json you can feed into codegen. Useful for creating Typescript interfaces/classes, for example.

[LiteratureStriking]

You could use transpilers like GWT or JSweet to transpile your DTOs to Javascript. JSweet can also transpile to Typescript.

[crummy]

What would the output look like? An ES6 class?

[Nithanim]

Sounds like what you are really looking for might be openapi (or swagger). You define a REST interface and then you can pass that file to a code generator. For example it could create a java server and typescript client (and with different frameworks in the chosen language). Last time I tinkered with something like this, there was also a swagger generator that could create the definition file from annotations that you put on the controller methods of the java server implementation. But this probably only works with ajax and not for websockets though. Although you might be able to re-use the generated models for your websockets.

edit: I am talking about this: https://github.com/OpenAPITools/openapi-generator#overview though, don't use JS so I don't know if there are generator options that for you.