diff --git a/src/org/kar/archidata/annotation/apiGenerator/ApiNotNull.java b/src/org/kar/archidata/annotation/apiGenerator/ApiNotNull.java
new file mode 100644
index 0000000..7f443ef
--- /dev/null
+++ b/src/org/kar/archidata/annotation/apiGenerator/ApiNotNull.java
@@ -0,0 +1,45 @@
+package org.kar.archidata.annotation.apiGenerator;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Annotation to explicitly define the nullability of a parameter in an API.
+ *
+ * This annotation allows marking a parameter as required (non-null) or optional (nullable),
+ * overriding any other nullability considerations. It is useful in API generation frameworks
+ * to ensure precise validation and documentation of method parameters.
+ *
+ * <p>Usage:
+ * - Target: This annotation can be applied to parameters.
+ * - Retention: The annotation is retained at runtime, allowing it to be
+ *   processed by frameworks or libraries that handle code generation logic.
+ *
+ * <p>Behavior:
+ * - When applied to a parameter, it explicitly marks it as optional or required in the API.
+ *   This annotation overrides all other considerations regarding nullability.
+ *
+ * <p>Example:
+ * <pre>{@code
+ * public class User {
+ *     @ReadOnlyField
+ *     @ApiNotNull
+ *     public String username;
+ *     public String email;
+ * }
+ * }</pre>
+ *
+ * In this example, the `username` field in the `User` class is explicitly marked as non-null in the generated API.
+ */
+@Target({ ElementType.PARAMETER })
+@Retention(RetentionPolicy.RUNTIME)
+public @interface ApiNotNull {
+	/**
+	 * (Optional) Specifies whether the API element can be null.
+	 * If set to `true`, the element is required (non-null).
+	 * If set to `false`, the element is optional (nullable).
+	 */
+	boolean value() default true;
+}
\ No newline at end of file
diff --git a/src/org/kar/archidata/externalRestApi/model/ClassObjectModel.java b/src/org/kar/archidata/externalRestApi/model/ClassObjectModel.java
index 79dd2a5..c1abd05 100644
--- a/src/org/kar/archidata/externalRestApi/model/ClassObjectModel.java
+++ b/src/org/kar/archidata/externalRestApi/model/ClassObjectModel.java
@@ -13,6 +13,7 @@ import java.util.Set;
 import org.kar.archidata.annotation.AnnotationTools;
 import org.kar.archidata.annotation.apiGenerator.ApiAccessLimitation;
 import org.kar.archidata.annotation.apiGenerator.ApiGenerationMode;
+import org.kar.archidata.annotation.apiGenerator.ApiNotNull;
 import org.kar.archidata.exception.DataAccessException;
 import org.kar.archidata.tools.AnnotationCreator;
 import org.slf4j.Logger;
@@ -83,13 +84,26 @@ public class ClassObjectModel extends ClassModel {
 			Email email,
 			ApiAccessLimitation accessLimitation,
 			Boolean notNull,
+			ApiNotNull apiNotNull,
 			Boolean columnNotNull,
 			Boolean nullable) {
 
-		public FieldProperty(final String name, final ClassModel model, final ClassModel linkClass,
-				final String comment, final Size stringSize, final Min min, final Max max, final DecimalMin decimalMin,
-				final DecimalMax decimalMax, final Pattern pattern, final Email email,
-				final ApiAccessLimitation accessLimitation, final Boolean notNull, final Boolean columnNotNull,
+		public FieldProperty(//
+				final String name, //
+				final ClassModel model, //
+				final ClassModel linkClass, //
+				final String comment, //
+				final Size stringSize, //
+				final Min min, //
+				final Max max, //
+				final DecimalMin decimalMin, //
+				final DecimalMax decimalMax, //
+				final Pattern pattern, //
+				final Email email, //
+				final ApiAccessLimitation accessLimitation, //
+				final Boolean notNull, //
+				final ApiNotNull apiNotNull, //
+				final Boolean columnNotNull, //
 				final Boolean nullable) {
 			this.name = name;
 			this.model = model;
@@ -108,6 +122,7 @@ public class ClassObjectModel extends ClassModel {
 				this.accessLimitation = accessLimitation;
 			}
 			this.notNull = notNull;
+			this.apiNotNull = apiNotNull;
 			this.columnNotNull = columnNotNull;
 			this.nullable = nullable;
 
@@ -160,6 +175,7 @@ public class ClassObjectModel extends ClassModel {
 					AnnotationTools.getConstraintsEmail(field), //
 					AnnotationTools.get(field, ApiAccessLimitation.class), //
 					AnnotationTools.getConstraintsNotNull(field), //
+					AnnotationTools.get(field, ApiNotNull.class), //
 					AnnotationTools.getColumnNotNull(field), //
 					AnnotationTools.getNullable(field));
 		}
diff --git a/src/org/kar/archidata/externalRestApi/typescript/TsClassElement.java b/src/org/kar/archidata/externalRestApi/typescript/TsClassElement.java
index 416a384..8029df7 100644
--- a/src/org/kar/archidata/externalRestApi/typescript/TsClassElement.java
+++ b/src/org/kar/archidata/externalRestApi/typescript/TsClassElement.java
@@ -237,6 +237,9 @@ public class TsClassElement {
 	}
 
 	public boolean isOptionalTypeZod(final FieldProperty field) {
+		if (field.apiNotNull() != null) {
+			return field.apiNotNull().value();
+		}
 		// Common checking element (apply to List, Map, ...)
 		if (field.nullable()) {
 			return true;
@@ -287,13 +290,13 @@ public class TsClassElement {
 					builder.append(")");
 				}
 			}
-			/*Must be tested before
+			/* Must be tested before
 			if (field.pattern() != null) {
 				builder.append(".regex((");
 				builder.append(field.pattern().regexp());
 				builder.append(")");
 			}*/
-			/*Must be tested before
+			/* Must be tested before
 			if (field.email() != null) {
 				builder.append(".regex((");
 				builder.append(field.email().regexp());