new attribute isJson issue #1173

Author: lvercelli-aizoon

src/main/java/io/swagger/codegen/v3/generators/DefaultCodegenConfig.java

@@ -2513,6 +2513,8 @@ public CodegenParameter fromParameter(Parameter parameter, Set<String> imports)
             codegenParameter.dataType = codegenProperty.datatype;
             codegenParameter.dataFormat = codegenProperty.dataFormat;
 
+            setParameterJson(codegenParameter, parameterSchema);
+
             if (getBooleanValue(codegenProperty, IS_ENUM_EXT_NAME)) {
                 codegenParameter.datatypeWithEnum = codegenProperty.datatypeWithEnum;
                 codegenParameter.enumName = codegenProperty.enumName;
@@ -4403,6 +4405,14 @@ protected void setParameterNullable(CodegenParameter parameter, CodegenProperty
         parameter.nullable = property.nullable;
     }
 
+    protected void setParameterJson(CodegenParameter codegenParameter, Schema parameterSchema) {
+        String contentType = parameterSchema.getExtensions() == null ? null : (String) parameterSchema.getExtensions().get("x-content-type");
+        if (contentType != null && contentType.startsWith("application/") && contentType.endsWith("json")) {
+            // application/json, application/problem+json, application/ld+json, some more?
+            codegenParameter.isJson = true;
+        }
+    }
+
     @Override
     public boolean needsUnflattenedSpec() {
         return false;

src/main/resources/handlebars/typescript-angular/api.service.mustache

@@ -175,7 +175,12 @@ export class {{classname}} {
             {{#useHttpClient}}queryParameters = {{/useHttpClient}}queryParameters.set('{{baseName}}', <any>{{paramName}}.toISOString());
         {{/isDateTime}}
         {{^isDateTime}}
+            {{#isJson}}
+            {{#useHttpClient}}queryParameters = {{/useHttpClient}}queryParameters.set('{{baseName}}', JSON.stringify({{paramName}}));
+            {{/isJson}}
+            {{^isJson}}
             {{#useHttpClient}}queryParameters = {{/useHttpClient}}queryParameters.set('{{baseName}}', <any>{{paramName}});
+            {{/isJson}}
         {{/isDateTime}}
         }
         {{/isListContainer}}