diff --git a/src/classes/api/endpoints/class-tainacan-rest-metadatum-mappers-controller.php b/src/classes/api/endpoints/class-tainacan-rest-metadatum-mappers-controller.php
index 547b70978..bd8099772 100644
--- a/src/classes/api/endpoints/class-tainacan-rest-metadatum-mappers-controller.php
+++ b/src/classes/api/endpoints/class-tainacan-rest-metadatum-mappers-controller.php
@@ -100,8 +100,8 @@ class REST_Metadatum_Mappers_Controller extends REST_Controller {
 	 * @return \WP_Error|\WP_REST_Response
 	 */
 	public function get_items( $request ) {
-		$collection_id = isset($request['collection_id']) ? $request['collection_id'] : '';
-		$disabled_mappers = get_post_meta($collection_id, 'disabled_mappers');
+		$collection_id = isset($request['collection_id']) ? $request['collection_id'] : 'default';
+		$disabled_mappers = get_post_meta($collection_id, 'disabled_mappers', false);
 		$Tainacan_Mappers = \Tainacan\Mappers_Handler::get_instance();
 
 		$metadatum_mappers = $Tainacan_Mappers->get_mappers( 'OBJECT' );
@@ -110,7 +110,7 @@ class REST_Metadatum_Mappers_Controller extends REST_Controller {
 		foreach ($metadatum_mappers as $metadatum_mapper){
 			if($metadatum_mapper->show_ui) {
 				$mapper = $this->prepare_item_for_response($metadatum_mapper, $request);
-				$mapper['disabled'] = in_array($metadatum_mapper->slug, $disabled_mappers) ? true : false;
+				$mapper['disabled'] = !empty($disabled_mappers) && in_array($metadatum_mapper->slug, $disabled_mappers) ? true : false;
 				array_push($prepared, $mapper);
 			}
 		}
@@ -123,16 +123,29 @@ class REST_Metadatum_Mappers_Controller extends REST_Controller {
 	 * @return \WP_Error|\WP_REST_Response
 	 */
 	public function get_item( $request ) {
+		if( !isset( $request['slug'] ) ) {
+			return new \WP_REST_Response([
+				'error_message' => __('Slug mapper not informed', 'tainacan'),
+			], 422);
+		}
+		
+		$collection_id = isset($request['collection_id']) ? $request['collection_id'] : 'default';
+		$disabled_mappers = get_post_meta($collection_id, 'disabled_mappers', false);
 		$Tainacan_Mappers = \Tainacan\Mappers_Handler::get_instance();
-
 		$metadatum_mappers = $Tainacan_Mappers->get_mappers( 'OBJECT' );
 
-		$prepared = [];
-		foreach ($metadatum_mappers as $metadatum_mapper){
-			if($metadatum_mapper->show_ui) array_push($prepared, $this->prepare_item_for_response($metadatum_mapper, $request));
+		$slug_mapper = $request['slug'];
+		$mapper_key = array_search($slug_mapper, array_column($metadatum_mappers, 'slug') );
+		if( $mapper_key === false ) {
+			return new \WP_REST_Response([
+				'error_message' => __('Mapper not found', 'tainacan'),
+			], 400);
 		}
+		$mapper = $metadatum_mappers[$mapper_key];
+		$prepared_mapper = $this->prepare_item_for_response($mapper, $request);
+		$prepared_mapper['disabled'] = !empty($disabled_mappers) && in_array($slug_mapper, $disabled_mappers) ? true : false;
 
-		return new \WP_REST_Response($prepared, 200);
+		return new \WP_REST_Response($prepared_mapper, 200);
 	}
 
 	/**
diff --git a/src/classes/mappers/class-tainacan-dublin-core.php b/src/classes/mappers/class-tainacan-dublin-core.php
index 6563765ae..4870094b4 100644
--- a/src/classes/mappers/class-tainacan-dublin-core.php
+++ b/src/classes/mappers/class-tainacan-dublin-core.php
@@ -10,6 +10,7 @@ namespace Tainacan\Mappers;
 class Dublin_Core extends Mapper {
 	public $slug = 'dublin-core';
 	public $name = 'Dublin Core';
+	public $description = 'The mapper of the Dublin Core standard';
 	public $allow_extra_metadata = true;
 	public $context_url = 'http://dublincore.org/documents/dcmi-terms/';
 	public $header = '<?xml version="1.0"?><!DOCTYPE rdf:RDF SYSTEM "http://dublincore.org/2000/12/01-dcmes-xml-dtd.dtd"><rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" ></rdf:RDF>';
diff --git a/src/classes/mappers/class-tainacan-mapper.php b/src/classes/mappers/class-tainacan-mapper.php
index 16b54689a..d9e8f7543 100644
--- a/src/classes/mappers/class-tainacan-mapper.php
+++ b/src/classes/mappers/class-tainacan-mapper.php
@@ -4,7 +4,8 @@ namespace Tainacan\Mappers;
 
 abstract class Mapper {
 	public $slug = null; // Slug of Mapper, used as option on api call 
-	public $name = null; // Public name do mapper
+	public $name = null; // Public name of the mapper
+	public $description = null; // Public descript of the mapper
 	public $allow_extra_metadata = true; // Allow more metadatum to be register
 	public $context_url = null; // URL of mapper documentation
 	public $type = ''; // The Class of the ontology that this mapping refers to. For example `CreativeWork`, which is a class of Schema.org if applied
@@ -39,6 +40,7 @@ abstract class Mapper {
 		return [
 			'slug' => $this->slug,
 			'name' => $this->name,
+			'description' => $this->description,
 			'allow_extra_metadata' => $this->allow_extra_metadata,
 			'context_url' => $this->context_url,
 			'metadata' => $this->metadata,
diff --git a/src/classes/mappers/class-tainacan-wiki-data.php b/src/classes/mappers/class-tainacan-wiki-data.php
index dbe88f942..780881c9f 100644
--- a/src/classes/mappers/class-tainacan-wiki-data.php
+++ b/src/classes/mappers/class-tainacan-wiki-data.php
@@ -10,6 +10,7 @@ namespace Tainacan\Mappers;
 class Wiki_Data extends Mapper {
 	public $slug = 'wiki-data';
 	public $name = 'WikiData';
+	public $description = 'The model mapper using the WikiData source';
 	public $allow_extra_metadata = true;
 	public $context_url = 'http://??????';
 	public $header = '??????';