diff --git a/AlgebraicDataflowArchitectureModel/src/generators/JavaImplementationVisitor.java b/AlgebraicDataflowArchitectureModel/src/generators/JavaImplementationVisitor.java
index 996a2c4..0387689 100644
--- a/AlgebraicDataflowArchitectureModel/src/generators/JavaImplementationVisitor.java
+++ b/AlgebraicDataflowArchitectureModel/src/generators/JavaImplementationVisitor.java
@@ -4,6 +4,7 @@
 import models.dataConstraintModel.DataConstraintModel;
 import models.dataConstraintModel.JsonAccessor;
 import models.dataConstraintModel.JsonTerm;
+import parser.Parser;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -174,18 +175,39 @@
 	
 	@Override
 	public code.ast.Expression visit(JsonTerm jsonTerm, String[] sideEffects) {
-		String temp = "temp_json" + jsonCount;
+		String tempName = "temp_json" + jsonCount;
+		code.ast.Variable tempVar = new code.ast.Variable(tempName);
 		jsonCount++;
 		
-		// TODO: Use proper ASTNode to construct an implementation code
-		String impl = "";
-		impl += "Map<String, Object> " + temp + " = new HashMap<>();\n";
-		for (String key : jsonTerm.keySet()) {
-			impl += temp + ".put(\"" + key + "\", " + jsonTerm.get(key).accept(this, sideEffects).toString() + ");\n";
-		}
-		sideEffects[0] += impl;
+		code.ast.Block sideEffectsBlock = new code.ast.Block();
 		
-		return new code.ast.Variable(temp);
+		// Map<String, Object> temp_jsonN = new HashMap<>();
+		code.ast.VariableDeclaration varDeclaration = new code.ast.VariableDeclaration(
+				DataConstraintModel.typeJson,
+				tempName,
+				new code.ast.ClassInstanceCreation(new code.ast.SimpleType("HashMap"))
+		);
+		code.ast.VariableDeclarationStatement varStatement = new code.ast.VariableDeclarationStatement();
+		varStatement.addFragment(varDeclaration);
+		
+		sideEffectsBlock.addStatement(varStatement);
+
+		// temp_jsonN.put("key", value);
+		for (String key : jsonTerm.keySet()) {
+			code.ast.MethodInvocation putCall = new code.ast.MethodInvocation(tempVar, "put");
+			List<code.ast.Expression> arguments = new ArrayList<>();
+			arguments.add(new code.ast.Constant(Parser.DOUBLE_QUOT + key + Parser.DOUBLE_QUOT));
+			arguments.add(jsonTerm.get(key).accept(this, sideEffects));
+			putCall.setArguments(arguments);
+
+			sideEffectsBlock.addStatement(new code.ast.ExpressionStatement(putCall));
+		}
+
+		for (String statementStr : sideEffectsBlock.getStatements()) {
+			sideEffects[0] += statementStr + "\n";
+		}
+
+		return tempVar;
 	}
 	
 	@Override