diff --git a/bin/json2yml.php b/bin/json2yml.php
new file mode 100755
index 0000000..d417e90
--- /dev/null
+++ b/bin/json2yml.php
@@ -0,0 +1,7 @@
+#!/usr/bin/php
+<?php
+require $_composer_autoload_path?? __DIR__.'/../vendor/autoload.php';
+
+use nulib\tools\Json2yamlApp;
+
+Json2yamlApp::run();
diff --git a/bin/yml2json.php b/bin/yml2json.php
new file mode 100755
index 0000000..ed27813
--- /dev/null
+++ b/bin/yml2json.php
@@ -0,0 +1,7 @@
+#!/usr/bin/php
+<?php
+require $_composer_autoload_path?? __DIR__.'/../vendor/autoload.php';
+
+use nulib\tools\Yaml2jsonApp;
+
+Yaml2jsonApp::run();
diff --git a/composer.json b/composer.json
index 796d0c3..1ba08c0 100644
--- a/composer.json
+++ b/composer.json
@@ -80,6 +80,8 @@
 	"bin": [
 		"bin/dumpser.php",
 		"bin/csv2xlsx.php",
+		"bin/json2yml.php",
+		"bin/yml2json.php",
 		"nur_bin/compctl.php",
 		"nur_bin/compdep.php",
 		"nur_bin/datectl.php",
diff --git a/src/schema/TODO.md b/src/schema/TODO.md
index bdc7e45..ee5c140 100644
--- a/src/schema/TODO.md
+++ b/src/schema/TODO.md
@@ -1,8 +1,5 @@
 # nulib\schema
 
-* l'ordre est `ensureAssoc [--> ensureKeys] [--> orderKeys]`
-* si false, supprimer la clé du tableau sauf si ensureKeys
-
 * pour AssocResult, les clés suivantes sont supportées:
   * false pour la clé courante
   * null pour un résultat aggrégé
diff --git a/src/schema/_assoc/AssocWrapper.php b/src/schema/_assoc/AssocWrapper.php
index 2b77804..0b8ff08 100644
--- a/src/schema/_assoc/AssocWrapper.php
+++ b/src/schema/_assoc/AssocWrapper.php
@@ -102,19 +102,6 @@ class AssocWrapper extends Wrapper {
     $result = $context->result;
     if (!$result->valid) return $what;
 
-    $schema = $context->schema;
-    $keys = $schema->getKeys();
-    $defaults = [];
-    $missings = null;
-    foreach ($keys as $key) {
-      $type = $wrapper->getType($key);
-      $default = $schema->getSchema($key)->default;
-      if ($default === null) $default = $type->getNullValue();
-      $defaults[$key] = $default;
-      $missing = $type->getMissingValue($valid);
-      if ($valid) $missings[$key] = $missing;
-    }
-
     foreach ($context->keyWrappers as $keyWrapper) {
       $keyWrapper->analyze($params);
       if ($keyWrapper->isValid()) continue;
@@ -129,11 +116,6 @@ class AssocWrapper extends Wrapper {
         $result->addInvalidMessage($keyWrapper);
       }
     }
-    if ($params["ensure_keys"] ?? $context->ensureKeys) {
-      $context->input->ensureKeys($defaults, $missings, $params);
-    } else {
-      $context->input->deleteMissings($missings, $params);
-    }
 
     return $what;
   }
@@ -143,10 +125,26 @@ class AssocWrapper extends Wrapper {
    * @param AssocWrapper $wrapper
    */
   static function _normalize(WrapperContext $context, Wrapper $wrapper, ?array $params): bool {
-    $ensureOrder = $params["ensure_order"] ?? $context->ensureOrder;
-    if ($ensureOrder) {
-      $schema = $context->schema;
-      $keys = $schema->getKeys();
+    $schema = $context->schema;
+    $keys = $schema->getKeys();
+
+    $defaults = [];
+    $missings = null;
+    foreach ($keys as $key) {
+      $type = $wrapper->getType($key);
+      $default = $schema->getSchema($key)->default;
+      if ($default === null) $default = $type->getNullValue();
+      $defaults[$key] = $default;
+      $missing = $type->getMissingValue($valid);
+      if ($valid) $missings[$key] = $missing;
+    }
+    if ($params["ensure_keys"] ?? $context->ensureKeys) {
+      $context->input->ensureKeys($defaults, $missings, $params);
+    } else {
+      $context->input->deleteMissings($missings, $params);
+    }
+
+    if ($params["ensure_order"] ?? $context->ensureOrder) {
       $context->input->ensureOrder($keys, $params);
     }
 
diff --git a/src/tools/Json2yamlApp.php b/src/tools/Json2yamlApp.php
new file mode 100644
index 0000000..ba729c1
--- /dev/null
+++ b/src/tools/Json2yamlApp.php
@@ -0,0 +1,23 @@
+<?php
+namespace nulib\tools;
+
+use nulib\app\cli\Application;
+use nulib\ext\json;
+use nulib\ext\yaml;
+use nulib\os\path;
+
+class Json2yamlApp extends Application {
+  private $args;
+
+  function main() {
+    $input = $this->args[0] ?? null;
+    if ($input === null || $input === "-") {
+      $output = null;
+    } else {
+      $output = path::ensure_ext($input, ".yml", ".json");
+    }
+
+    $data = json::load($input);
+    yaml::dump($data, $output);
+  }
+}
\ No newline at end of file
diff --git a/src/tools/Yaml2jsonApp.php b/src/tools/Yaml2jsonApp.php
new file mode 100644
index 0000000..9eba6ea
--- /dev/null
+++ b/src/tools/Yaml2jsonApp.php
@@ -0,0 +1,23 @@
+<?php
+namespace nulib\tools;
+
+use nulib\app\cli\Application;
+use nulib\ext\json;
+use nulib\ext\yaml;
+use nulib\os\path;
+
+class Yaml2jsonApp extends Application {
+  private $args;
+
+  function main() {
+    $input = $this->args[0] ?? null;
+    if ($input === null || $input === "-") {
+      $output = null;
+    } else {
+      $output = path::ensure_ext($input, ".json", [".yml", ".yaml"]);
+    }
+
+    $data = yaml::load($input);
+    json::dump($data, $output);
+  }
+}
\ No newline at end of file