diff --git a/docs/docs/json-mapper.md b/docs/docs/json-mapper.md
index afb5e81195b..651bdf1ed63 100644
--- a/docs/docs/json-mapper.md
+++ b/docs/docs/json-mapper.md
@@ -110,7 +110,7 @@ It means, if you missed decorating one or more properties on your model, these p
 
 ## Ignore properties (deprecated)
 
-::: warn deprecated
+::: warning deprecated
 This decorator is deprecated. Use @@Groups@@ decorator instead of.
 :::
 
@@ -318,7 +318,7 @@ and import the mapper in your application.
   </Tab>
 </Tabs>
 
-::: warn
+::: warning
 
 Ts.ED doesn't transform Date to date format or hours format because it depends on each project guidelines.
 
diff --git a/packages/specs/json-mapper/src/interfaces/JsonMapperMethods.ts b/packages/specs/json-mapper/src/interfaces/JsonMapperMethods.ts
index f69abb33d62..65fc095473f 100644
--- a/packages/specs/json-mapper/src/interfaces/JsonMapperMethods.ts
+++ b/packages/specs/json-mapper/src/interfaces/JsonMapperMethods.ts
@@ -4,6 +4,9 @@ export interface JsonMapperCtx<T = any, C = any> {
   collectionType: Type<C> | undefined;
   type: Type<T> | T;
   next: JsonMapperNext;
+  options: {
+    format?: string;
+  };
 }
 
 export interface JsonMapperNext {
diff --git a/packages/specs/json-mapper/test/integration/date.integration.spec.ts b/packages/specs/json-mapper/test/integration/date.integration.spec.ts
index a5c17edd7f3..6d0d4e3a24c 100644
--- a/packages/specs/json-mapper/test/integration/date.integration.spec.ts
+++ b/packages/specs/json-mapper/test/integration/date.integration.spec.ts
@@ -1,12 +1,12 @@
 import {isBoolean} from "@tsed/core";
 import {DateFormat} from "@tsed/schema";
-import {JsonMapper, JsonMapperContext, JsonMapperMethods, serialize} from "../../src/index";
+import {JsonMapper, JsonMapperCtx, JsonMapperMethods, serialize} from "../../src/index";
 
 @JsonMapper(Date)
 export class DateMapper implements JsonMapperMethods {
-  deserialize(data: string | number, ctx: JsonMapperContext): Date;
-  deserialize(data: boolean | null | undefined, ctx: JsonMapperContext): boolean | null | undefined;
-  deserialize(data: any, ctx: JsonMapperContext): any {
+  deserialize(data: string | number, ctx: JsonMapperCtx): Date;
+  deserialize(data: boolean | null | undefined, ctx: JsonMapperCtx): boolean | null | undefined;
+  deserialize(data: any, ctx: JsonMapperCtx): any {
     // don't convert unexpected data. In normal case, Ajv reject unexpected data.
     // But by default, we have to skip data deserialization and let user to apply
     // the right mapping
@@ -17,7 +17,7 @@ export class DateMapper implements JsonMapperMethods {
     return new Date(data);
   }
 
-  serialize(object: Date, ctx: JsonMapperContext): any {
+  serialize(object: Date, ctx: JsonMapperCtx): any {
     const date = new Date(object);
 
     switch (ctx.options.format) {