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WebDSL includes a simple way to define string and JSON-based webservices.


The JSON interface is defined as follows:

  native class org.json.JSONObject as JSONObject {
    get(String) : Object
    getBoolean(String) : Bool
    getDouble(String) : Double
    getInt(String) : Int
    getJSONArray(String) : JSONArray
    getJSONObject(String) : JSONObject
    getString(String) : String
    has(String) : Bool
    names() : JSONArray
    put(String, Object)
    toString() : String
    toString(Int) : String

  native class org.json.JSONArray as JSONArray {
    get(Int) : Object
    getBoolean(Int) : Bool
    getDouble(Int) : Double
    getInt(Int) : Int
    getJSONArray(Int) : JSONArray
    getJSONObject(Int) : JSONObject
    getString(Int) : String
    length() : Int
    join(String) : String
    toString() : String
    toString(Int) : String

Example use in WebDSL:

function myJsonFun() : String {
    var obj := JSONObject("{}");
    obj.put("name", "Pete");
    obj.put("age", 27);
    return obj.toString();
    // Will return '{"name": "Pete", "age": 27}'

Defining services

A service is simply a WebDSL function that uses the service keyword instead of function, you don't have to specify a return type, it will convert anything you return to a string (using .toString()):

entity Document {
  title : String (id, name)
  text  : Text

service document(id : String) {
  if(getHttpMethod() == "GET") {
     var doc := findDocument(id);
     var json := JSONObject();
     json.put("title", doc.title);
     json.put("text", doc.text);
     return json;
  if(getHttpMethod() == "PUT") {
    var doc := getUniqueDocument(id);
    var json := JSONObject(readRequestBody());
    doc.text := json.getString("text");
    return doc.title;

services are mapped to /serviceName, e.g. /document. Here's a few sample requests to test (note, these are services part of an application called "hellojson"):

$ curl -X PUT 'http://localhost:8080/hellojson/document/my-first-doc' \
       -d '{"text": "This is my first document"}'
$ curl http://localhost:8080/hellojson/document/my-first-doc
{"text":""This is my first document","title":"my-first-doc"}

But, like pages, services can also have entities as arguments:

service documentJson(doc : Document) {
   var obj := JSONObject();
   obj.put("title", doc.title);
   obj.put("text", doc.text);
   return obj;
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