diff --git a/src/CookieParameter.ts b/src/CookieParameter.ts
index 6d53ebe..8a6ca4e 100644
--- a/src/CookieParameter.ts
+++ b/src/CookieParameter.ts
@@ -1,5 +1,5 @@
-import { PrimitiveType, ObjectType, ArrayType } from "./Types";
-import * as Core from "./Core";
+import { PrimitiveType, ObjectType, ArrayType, ParameterOfForm } from "./Types";
+import * as Guard from "./Guard";
 
 export interface Parameter {
   value: PrimitiveType | ObjectType | ArrayType;
@@ -9,7 +9,36 @@ export interface Parameter {
 
 export const generate = (key: string | number, params: Parameter): string | undefined => {
   if (params.style === "form") {
-    return Core.generateFormParamter(key, params);
+    return generateFormParamter(key, params);
   }
   return undefined;
 };
+
+const generateFormParamter = (key: string | number, params: ParameterOfForm): string => {
+  if (Guard.isEmpty(params.value)) {
+    return `${key}=`;
+  }
+  if (Guard.isPrimitive(params.value)) {
+    return `${key}=${params.value}`;
+  }
+  if (Guard.isArray(params.value)) {
+    if (params.explode) {
+      return params.value.map(item => `${key}=${item}`).join(";");
+    } else {
+      return `${key}=${params.value.join(",")}`;
+    }
+  }
+  if (Guard.isObject(params.value)) {
+    if (params.explode) {
+      return Object.entries(params.value)
+        .map(([k, v]) => `${k}=${v}`)
+        .join(";");
+    } else {
+      const value = Object.entries(params.value)
+        .map(([k, v]) => `${k},${v}`)
+        .join(",");
+      return `${key}=${value}`;
+    }
+  }
+  return `${key}=`;
+};
diff --git a/src/Core.ts b/src/Core.ts
index bc36b20..2e22780 100644
--- a/src/Core.ts
+++ b/src/Core.ts
@@ -37,74 +37,121 @@ export const generateFromSimple = (key: string | number, params: ParameterOfSimp
 };
 
 export const generateFormParamter = (key: string | number, params: ParameterOfForm): string => {
+  return generateFormParamterAsURLSearchParams(key, params).toString();
+};
+
+export const generateFormParamterAsURLSearchParams = (key: string | number, params: ParameterOfForm): URLSearchParams => {
+  const queryParams = new URLSearchParams();
   if (Guard.isEmpty(params.value)) {
-    return `${key}=`;
+    queryParams.append(key.toString(), "");
+    return queryParams;
   }
+
   if (Guard.isPrimitive(params.value)) {
-    return `${key}=${params.value}`;
+    queryParams.append(key.toString(), params.value?.toString() ?? "");
+    return queryParams;
   }
+
   if (Guard.isArray(params.value)) {
     if (params.explode) {
-      return params.value.map(item => `${key}=${item}`).join("&");
+      params.value.map(item => {
+        queryParams.append(key.toString(), item.toString());
+      });
     } else {
-      return `${key}=${params.value.join(",")}`;
+      queryParams.append(key.toString(), params.value.join(","));
     }
+    return queryParams;
   }
+
   if (Guard.isObject(params.value)) {
     if (params.explode) {
-      return Object.entries(params.value)
-        .map(([k, v]) => `${k}=${v}`)
-        .join("&");
+      Object.entries(params.value).map(([k, v]) => {
+        queryParams.append(k.toString(), v.toString());
+      });
     } else {
       const value = Object.entries(params.value)
         .map(([k, v]) => `${k},${v}`)
         .join(",");
-      return `${key}=${value}`;
+      queryParams.append(key.toString(), value);
     }
+    return queryParams;
   }
-  return `${key}=`;
+
+  queryParams.append(key.toString(), "");
+  return queryParams;
 };
 
 export const generateSpaceDelimited = (key: string | number, params: ParameterOfSpaceDelimited): string | undefined => {
+  return generateSpaceDelimitedAsURLSearchParams(key, params)?.toString();
+};
+
+export const generateSpaceDelimitedAsURLSearchParams = (
+  key: string | number,
+  params: ParameterOfSpaceDelimited,
+): URLSearchParams | undefined => {
+  const queryParams = new URLSearchParams();
   if (Guard.isArray(params.value)) {
-    return encodeURIComponent(params.value.join(" "));
+    queryParams.append(key.toString(), params.value.join(" "));
+    return queryParams;
   }
+
   if (Guard.isObject(params.value)) {
     const value = Object.entries(params.value)
       .map(([k, v]) => `${k} ${v}`)
       .join(" ");
-    return encodeURIComponent(value);
+    queryParams.append(key.toString(), value);
+    return queryParams;
   }
+
   return undefined;
 };
 
 export const generatePipeDelimitedParameter = (key: string | number, params: ParameterOfPipeDelimited): string | undefined => {
+  return generatePipeDelimitedParameterAsURLSearchParams(key, params)?.toString();
+};
+
+export const generatePipeDelimitedParameterAsURLSearchParams = (
+  key: string | number,
+  params: ParameterOfPipeDelimited,
+): URLSearchParams | undefined => {
+  const queryParams = new URLSearchParams();
   if (Guard.isArray(params.value)) {
-    return params.value.join("|");
+    queryParams.append(key.toString(), params.value.join("|"));
+    return queryParams;
   }
+
   if (Guard.isObject(params.value)) {
     const value = Object.entries(params.value)
       .map(([k, v]) => `${k}|${v}`)
       .join("|");
-    return value;
+    queryParams.append(key.toString(), value);
+    return queryParams;
   }
+
   return undefined;
 };
 
 export const generateDeepObjectParameter = (key: string | number, params: ParameterOfDeepObject): string | undefined => {
+  return generateDeepObjectParameterAsURLSearchParams(key, params)?.toString();
+};
+
+export const generateDeepObjectParameterAsURLSearchParams = (
+  key: string | number,
+  params: ParameterOfDeepObject,
+): URLSearchParams | undefined => {
   if (!Guard.isObject(params.value)) {
     return undefined;
   }
+  const queryParams = new URLSearchParams();
   const flatObject = flatten<ObjectType, { [key: string]: PrimitiveType }>(params.value);
-  return Object.entries(flatObject)
-    .map(([dotKeyName, primitiveValue]) => {
-      const nestedKey = dotKeyName
-        .split(".")
-        .map(k1 => `[${k1}]`)
-        .join("");
-      return `${[key]}${nestedKey}=${primitiveValue}`;
-    })
-    .join("&");
+  Object.entries(flatObject).map(([dotKeyName, primitiveValue]) => {
+    const nestedKey = dotKeyName
+      .split(".")
+      .map(k1 => `[${k1}]`)
+      .join("");
+    queryParams.append(`${key}${nestedKey}`, primitiveValue?.toString() ?? "");
+  });
+  return queryParams;
 };
 
 export const generateFromMatrix = (key: string | number, params: ParameterOfMatrix): string | undefined => {
diff --git a/src/QueryParameter.ts b/src/QueryParameter.ts
index a20769c..937efff 100644
--- a/src/QueryParameter.ts
+++ b/src/QueryParameter.ts
@@ -18,3 +18,19 @@ export const generate = (key: string | number, params: Parameter): string | unde
   }
   return undefined;
 };
+
+export const generateAsURLSearchParams = (key: string | number, params: Parameter): URLSearchParams | undefined => {
+  if (params.style === "form") {
+    return Core.generateFormParamterAsURLSearchParams(key, params);
+  }
+  if (params.style === "spaceDelimited") {
+    return Core.generateSpaceDelimitedAsURLSearchParams(key, params);
+  }
+  if (params.style === "pipeDelimited") {
+    return Core.generatePipeDelimitedParameterAsURLSearchParams(key, params);
+  }
+  if (params.style === "deepObject") {
+    return Core.generateDeepObjectParameterAsURLSearchParams(key, params);
+  }
+  return undefined;
+};
diff --git a/src/__tests__/CookieParameter-test.ts b/src/__tests__/CookieParameter-test.ts
index 7e4ce04..b2c8c15 100644
--- a/src/__tests__/CookieParameter-test.ts
+++ b/src/__tests__/CookieParameter-test.ts
@@ -55,7 +55,7 @@ describe("CookieParameter - style:form", () => {
       style: "form",
       explode: true,
     });
-    expect(result).toBe("color=blue&color=black&color=brown");
+    expect(result).toBe("color=blue;color=black;color=brown");
   });
   test("explode:false value:object", () => {
     const result1 = CookieParameter.generate("color", {
@@ -79,6 +79,6 @@ describe("CookieParameter - style:form", () => {
       style: "form",
       explode: true,
     });
-    expect(result1).toBe("R=100&G=200&B=150");
+    expect(result1).toBe("R=100;G=200;B=150");
   });
 });
diff --git a/src/__tests__/DeepObject-test.ts b/src/__tests__/DeepObject-test.ts
index af4a11e..13593c5 100644
--- a/src/__tests__/DeepObject-test.ts
+++ b/src/__tests__/DeepObject-test.ts
@@ -7,7 +7,7 @@ describe("QueryParameter - style:deepObject", () => {
       style: "deepObject",
       explode: true,
     });
-    expect(result1).toBe(`filters[level1][level2]=hello`);
+    expect(result1?.toString()).toBe(`filters%5Blevel1%5D%5Blevel2%5D=hello`);
   });
   test("explode:true / nest value", () => {
     const result1 = QueryParameter.generate("filters", {
@@ -15,7 +15,7 @@ describe("QueryParameter - style:deepObject", () => {
       style: "deepObject",
       explode: true,
     });
-    expect(result1).toBe(`filters[level1][level2][level3]=hello`);
+    expect(result1?.toString()).toBe(`filters%5Blevel1%5D%5Blevel2%5D%5Blevel3%5D=hello`);
   });
   test("explode:true / nest value", () => {
     const result1 = QueryParameter.generate("filters", {
@@ -23,6 +23,6 @@ describe("QueryParameter - style:deepObject", () => {
       style: "deepObject",
       explode: true,
     });
-    expect(result1).toBe(`filters[level1][level2][level3]=hello&filters[level1][level2-1][level3-1]=world`);
+    expect(result1?.toString()).toBe(`filters%5Blevel1%5D%5Blevel2%5D%5Blevel3%5D=hello&filters%5Blevel1%5D%5Blevel2-1%5D%5Blevel3-1%5D=world`);
   });
 });
diff --git a/src/__tests__/QueryParameter-test.ts b/src/__tests__/QueryParameter-test.ts
index 9ad4cfd..4e47175 100644
--- a/src/__tests__/QueryParameter-test.ts
+++ b/src/__tests__/QueryParameter-test.ts
@@ -47,7 +47,7 @@ describe("QueryParameter - style:form", () => {
       style: "form",
       explode: false,
     });
-    expect(result).toBe("color=blue,black,brown");
+    expect(result).toBe("color=blue%2Cblack%2Cbrown");
   });
   test("explode:true value:string[]", () => {
     const result = QueryParameter.generate("color", {
@@ -67,7 +67,7 @@ describe("QueryParameter - style:form", () => {
       style: "form",
       explode: false,
     });
-    expect(result1).toBe("color=R,100,G,200,B,150");
+    expect(result1).toBe("color=R%2C100%2CG%2C200%2CB%2C150");
   });
   test("explode:true value:object", () => {
     const result1 = QueryParameter.generate("color", {
@@ -90,7 +90,7 @@ describe("QueryParameter - style:spaceDelimited", () => {
       style: "spaceDelimited",
       explode: false,
     });
-    expect(result1).toBe("blue%20black%20brown");
+    expect(result1).toBe("color=blue+black+brown");
   });
   test("explode:false value:object", () => {
     const result1 = QueryParameter.generate("color", {
@@ -102,7 +102,7 @@ describe("QueryParameter - style:spaceDelimited", () => {
       style: "spaceDelimited",
       explode: false,
     });
-    expect(result1).toBe("R%20100%20G%20200%20B%20150");
+    expect(result1).toBe("color=R+100+G+200+B+150");
   });
 });
 
@@ -113,7 +113,7 @@ describe("QueryParameter - style:pipeDelimited", () => {
       style: "pipeDelimited",
       explode: false,
     });
-    expect(result1).toBe("blue|black|brown");
+    expect(result1).toBe("color=blue%7Cblack%7Cbrown");
   });
   test("explode:false value:object", () => {
     const result1 = QueryParameter.generate("color", {
@@ -125,7 +125,7 @@ describe("QueryParameter - style:pipeDelimited", () => {
       style: "pipeDelimited",
       explode: false,
     });
-    expect(result1).toBe("R|100|G|200|B|150");
+    expect(result1).toBe("color=R%7C100%7CG%7C200%7CB%7C150");
   });
 });
 
@@ -140,6 +140,6 @@ describe("QueryParameter - style:deepObject", () => {
       style: "deepObject",
       explode: true,
     });
-    expect(result1).toBe("color[R]=100&color[G]=200&color[B]=150");
+    expect(result1).toBe("color%5BR%5D=100&color%5BG%5D=200&color%5BB%5D=150");
   });
 });