diff --git a/src/main/java/org/gcube/informationsystem/queries/templates/impl/entities/QueryTemplateImpl.java b/src/main/java/org/gcube/informationsystem/queries/templates/impl/entities/QueryTemplateImpl.java
index f90b528..9ac9461 100644
--- a/src/main/java/org/gcube/informationsystem/queries/templates/impl/entities/QueryTemplateImpl.java
+++ b/src/main/java/org/gcube/informationsystem/queries/templates/impl/entities/QueryTemplateImpl.java
@@ -2,12 +2,15 @@ package org.gcube.informationsystem.queries.templates.impl.entities;
 
 import java.io.IOException;
 import java.util.HashMap;
+import java.util.Iterator;
 import java.util.Map;
 
 import org.gcube.com.fasterxml.jackson.annotation.JsonTypeName;
 import org.gcube.com.fasterxml.jackson.core.JsonProcessingException;
 import org.gcube.com.fasterxml.jackson.databind.JsonNode;
 import org.gcube.com.fasterxml.jackson.databind.ObjectMapper;
+import org.gcube.com.fasterxml.jackson.databind.node.ArrayNode;
+import org.gcube.com.fasterxml.jackson.databind.node.ObjectNode;
 import org.gcube.informationsystem.base.impl.entities.EntityElementImpl;
 import org.gcube.informationsystem.queries.templates.reference.entities.QueryTemplate;
 import org.gcube.informationsystem.queries.templates.reference.properties.TemplateVariable;
@@ -29,8 +32,10 @@ public class QueryTemplateImpl extends EntityElementImpl implements QueryTemplat
 	protected ObjectMapper objectMapper;
 	protected JsonNode template;
 	
+	
 	protected Map<String, TemplateVariable> templateVariables;
-
+	protected JsonNode params;
+	
 	public QueryTemplateImpl() {
 		this.templateVariables = new HashMap<>();
 		this.objectMapper = new ObjectMapper();
@@ -87,4 +92,59 @@ public class QueryTemplateImpl extends EntityElementImpl implements QueryTemplat
 		this.templateVariables.put(name, templateVariable);
 	}
 
+	@Override
+	public JsonNode getJsonQuery() throws Exception {
+		ObjectNode objectNode = objectMapper.createObjectNode();
+		for(TemplateVariable tv : templateVariables.values()) {
+			objectNode.put(tv.getName(), tv.getDefaultValue());
+		}
+		return getJsonQuery(objectNode);
+	}
+
+	protected JsonNode replaceVariables(JsonNode jsonNode) throws Exception {
+		Iterator<String> fieldNames = jsonNode.fieldNames();
+		while(fieldNames.hasNext()) {
+			String fieldName = fieldNames.next();
+			JsonNode node = jsonNode.get(fieldName);
+			switch (node.getNodeType()) {
+				case OBJECT:
+					node = replaceVariables(node);
+					((ObjectNode) jsonNode).set(fieldName, node);
+					break;
+	
+				case ARRAY:
+					ArrayNode arrayNode = (ArrayNode) node;
+			        for(int i = 0; i < arrayNode.size(); i++) {
+			            JsonNode arrayElement = arrayNode.get(i);
+			            arrayElement = replaceVariables(arrayElement);
+			            arrayNode.set(i, arrayElement);
+			        }
+					break;
+					
+				case STRING:
+					String value = node.asText();
+					if(templateVariables.containsKey(value)) {
+						JsonNode jn = params.get(value);
+						if(jn == null) {
+							throw new Exception("No value provided for " + value + " variables");
+						}
+						((ObjectNode) jsonNode).set(fieldName, jn);
+					}
+					break;
+					
+				default:
+					break;
+			}
+		}
+		return jsonNode;
+	}
+	
+	@Override
+	public JsonNode getJsonQuery(JsonNode values) throws Exception {
+		this.params = values;
+		JsonNode query = template.deepCopy();
+		query = replaceVariables(query);
+		return query;
+	}
+
 }
diff --git a/src/main/java/org/gcube/informationsystem/queries/templates/reference/entities/QueryTemplate.java b/src/main/java/org/gcube/informationsystem/queries/templates/reference/entities/QueryTemplate.java
index 3fd78fe..64235b2 100644
--- a/src/main/java/org/gcube/informationsystem/queries/templates/reference/entities/QueryTemplate.java
+++ b/src/main/java/org/gcube/informationsystem/queries/templates/reference/entities/QueryTemplate.java
@@ -69,4 +69,17 @@ public interface QueryTemplate extends EntityElement {
 	 */
 	public void addTemplateVariable(TemplateVariable templateVariable);
 	
-}
+	/**
+	 * @return the JsonQuery replacing the variables using the default values contained in TemplateVariables
+	 * @throws Exception 
+	 */
+	public JsonNode getJsonQuery() throws Exception;
+	
+	/**
+	 * @param values
+	 * @return the JsonQuery replacing the variables using the provided values
+	 * @throws Exception 
+	 */
+	public JsonNode getJsonQuery(JsonNode values) throws Exception;
+	
+}
\ No newline at end of file