diff --git a/codegens/csharp-restsharp/lib/parseRequest.js b/codegens/csharp-restsharp/lib/parseRequest.js
index c900f42b7..4a8fec79c 100644
--- a/codegens/csharp-restsharp/lib/parseRequest.js
+++ b/codegens/csharp-restsharp/lib/parseRequest.js
@@ -78,8 +78,12 @@ function parseBody (request, trimFields) {
       case 'formdata':
         return parseFormData(requestBody, trimFields);
       case 'raw':
-        return `request.AddParameter("${parseContentType(request)}", ` +
-                    `${JSON.stringify(requestBody[requestBody.mode])},  ParameterType.RequestBody);\n`;
+        return `var body = ${requestBody[requestBody.mode]
+          .split('\n')
+          .map((line) => { return '@"' + line.replace(/"/g, '""') + '"'; })
+          .join(' + "\\n" +\n')};\n` +
+          `request.AddParameter("${parseContentType(request)}", ` +
+          'body,  ParameterType.RequestBody);\n';
       case 'graphql':
         return parseGraphQL(requestBody, trimFields);
         /* istanbul ignore next */
diff --git a/codegens/dart-http/lib/index.js b/codegens/dart-http/lib/index.js
index 61857ee4c..5e0105131 100644
--- a/codegens/dart-http/lib/index.js
+++ b/codegens/dart-http/lib/index.js
@@ -30,8 +30,20 @@ function parseUrlEncoded (body, indent, trim) {
  *
  * @param {Object} body Raw body data
  * @param {Boolean} trim indicates whether to trim string or not
+ * @param {String} contentType the content-type of request body
+ * @param {Integer} indentCount the number of space to use
  */
-function parseRawBody (body, trim) {
+function parseRawBody (body, trim, contentType, indentCount) {
+  if (contentType && (contentType === 'application/json' || contentType.match(/\+json$/))) {
+    try {
+      let jsonBody = JSON.parse(body);
+      return `request.body = json.encode(${JSON.stringify(jsonBody, null, indentCount)});`;
+
+    }
+    catch (error) {
+      // Do nothing
+    }
+  }
   return `request.body = '''${sanitize(body, trim)}''';`;
 }
 
@@ -109,15 +121,16 @@ function parseFormData (body, indent, trim) {
  *
  * @param {Object} body body object from request.
  * @param {String} indent indentation required for code snippet
- * @param {trim} trim indicates whether to trim string or not
+ * @param {Boolean} trim indicates whether to trim string or not
+ * @param {String} contentType the content-type of the request body
  */
-function parseBody (body, indent, trim) {
+function parseBody (body, indent, trim, contentType) {
   if (!_.isEmpty(body)) {
     switch (body.mode) {
       case 'urlencoded':
         return parseUrlEncoded(body.urlencoded, indent, trim);
       case 'raw':
-        return parseRawBody(body.raw, trim);
+        return parseRawBody(body.raw, trim, contentType, indent.length);
       case 'formdata':
         return parseFormData(body.formdata, indent, trim);
       case 'graphql':
@@ -167,13 +180,10 @@ self = module.exports = {
       footerSnippet = '',
       trim,
       timeout,
-      followRedirect;
+      followRedirect,
+      contentType;
     options = sanitizeOptions(options, self.getOptions());
-    if (options.includeBoilerplate) {
-      headerSnippet = 'import \'package:http/http.dart\' as http;\n\n';
-      headerSnippet += 'void main() async {\n';
-      footerSnippet = '}\n';
-    }
+
     trim = options.trimRequestBody;
     indent = options.indentType === 'Tab' ? '\t' : ' ';
     indent = indent.repeat(options.indentCount);
@@ -199,6 +209,16 @@ self = module.exports = {
       }
     }
 
+    contentType = request.headers.get('Content-Type');
+    if (options.includeBoilerplate) {
+      if (contentType && (contentType === 'application/json' || contentType.match(/\+json$/))) {
+        headerSnippet = 'import \'dart:convert\';\n';
+      }
+      headerSnippet += 'import \'package:http/http.dart\' as http;\n\n';
+      headerSnippet += 'void main() async {\n';
+      footerSnippet = '}\n';
+    }
+
     // The following code handles multiple files in the same formdata param.
     // It removes the form data params where the src property is an array of filepath strings
     // Splits that array into different form data params with src set as a single filepath string
@@ -243,7 +263,7 @@ self = module.exports = {
 
     const headers = parseHeaders(request.headers.toJSON(), indent, trim),
       requestBody = request.body ? request.body.toJSON() : {},
-      body = parseBody(requestBody, indent, trim) + '\n';
+      body = parseBody(requestBody, indent, trim, contentType) + '\n';
 
     codeSnippet += headers;