diff --git a/packages/contracts/src/http/query-parameter-bag.ts b/packages/contracts/src/http/query-parameter-bag.ts
new file mode 100644
index 00000000..a8fd1060
--- /dev/null
+++ b/packages/contracts/src/http/query-parameter-bag.ts
@@ -0,0 +1,21 @@
+
+import { ParameterBag } from '../index.js'
+
+export interface QueryParameterBag<T> extends ParameterBag<T> {
+  /**
+   * Returns the querystring created from all items in this query parameter bag,
+   * without the leading question mark `?`.
+   *
+   * **Notice:** the returned querystring is encoded. Node.js automatically
+   * encodes the querystring to ensure a valid URL. Some characters would
+   * break the URL string otherwise. This way ensures the valid string.
+   */
+  toQuerystring (): string
+
+  /**
+   * Returns the decoded querystring by running the result of `toQuerystring`
+   * through `decodeURIComponent`. This method is useful to debug during
+   * development. It’s recommended to use `toQuerystring` in production.
+   */
+  toQuerystringDecoded (): string
+}
diff --git a/packages/contracts/src/http/request.ts b/packages/contracts/src/http/request.ts
index aa2014eb..554741f9 100644
--- a/packages/contracts/src/http/request.ts
+++ b/packages/contracts/src/http/request.ts
@@ -11,6 +11,7 @@ import { IncomingHttpHeaders, IncomingMessage } from 'node:http'
 import { InteractsWithState } from './concerns/interacts-with-state.js'
 import { RequestCookieBuilderCallback } from './cookie-options-builder.js'
 import { InteractsWithContentTypes } from './concerns/interacts-with-content-types.js'
+import { QueryParameterBag } from './query-parameter-bag.js'
 
 export interface HttpRequestCtor extends MacroableCtor {
   /**
@@ -66,7 +67,7 @@ export interface HttpRequest extends InteractsWithState, InteractsWithContentTyp
   /**
    * Returns the query parameter bag.
    */
-  query(): ParameterBag<string | string[]>
+  query(): QueryParameterBag<string | string[]>
 
   /**
    * Returns the plain query string, without the leading ?.
diff --git a/packages/contracts/src/index.ts b/packages/contracts/src/index.ts
index d2c7e565..93957a8f 100644
--- a/packages/contracts/src/index.ts
+++ b/packages/contracts/src/index.ts
@@ -37,6 +37,7 @@ export { StateBag, HttpStateData } from './http/concerns/state-bag.js'
 export { FileBag } from './http/file-bag.js'
 export { InputBag } from './http/input-bag.js'
 export { ParameterBag } from './http/parameter-bag.js'
+export { QueryParameterBag } from './http/query-parameter-bag.js'
 export { HttpKernel } from './http/kernel.js'
 export { HttpMethods } from './http/methods.js'
 export { Middleware, MiddlewareCtor, InlineMiddlewareHandler } from './http/middleware.js'
diff --git a/packages/http/src/server/input-bag.ts b/packages/http/src/server/input-bag.ts
index 199bec91..5d1ada81 100644
--- a/packages/http/src/server/input-bag.ts
+++ b/packages/http/src/server/input-bag.ts
@@ -11,7 +11,7 @@ export class InputBag<T> implements InputBagContract<T> {
   /**
    * Create a new instance.
    */
-  constructor (attributes: Dict<T>) {
+  constructor (attributes: Dict<T> | undefined) {
     this.attributes = attributes ?? {}
   }
 
diff --git a/packages/http/src/server/query-parameter-bag.ts b/packages/http/src/server/query-parameter-bag.ts
new file mode 100644
index 00000000..32b3196e
--- /dev/null
+++ b/packages/http/src/server/query-parameter-bag.ts
@@ -0,0 +1,31 @@
+'use strict'
+
+import { ParameterBag } from './parameter-bag.js'
+import { QueryParameterBag as QueryParameterBagContract } from '@supercharge/contracts'
+
+export class QueryParameterBag<T> extends ParameterBag<T> implements QueryParameterBagContract<T> {
+  /**
+   * Returns the query string created from all items in this query parameter bag,
+   * without the leading question mark `?`.
+   *
+   * **Notice:** the returned querystring is encoded. Node.js automatically
+   * encodes the querystring to ensure a valid URL. Some characters would
+   * break the URL string otherwise. This way ensures the valid string.
+   */
+  toQuerystring (): string {
+    return new URLSearchParams(
+      this.all() as Record<string, string>
+    ).toString()
+  }
+
+  /**
+   * Returns the decoded querystring by running the result of `toQuerystring`
+   * through `decodeURIComponent`. This method is useful to debug during
+   * development. It’s recommended to use `toQuerystring` in production.
+   */
+  toQuerystringDecoded (): string {
+    return decodeURIComponent(
+      this.toQuerystring()
+    )
+  }
+}
diff --git a/packages/http/src/server/request.ts b/packages/http/src/server/request.ts
index d7fcb253..6b2fffec 100644
--- a/packages/http/src/server/request.ts
+++ b/packages/http/src/server/request.ts
@@ -10,6 +10,7 @@ import { CookieBag } from './cookie-bag.js'
 import { ParameterBag } from './parameter-bag.js'
 import { Macroable } from '@supercharge/macroable'
 import { RequestHeaderBag } from './request-header-bag.js'
+import { QueryParameterBag } from './query-parameter-bag.js'
 import { InteractsWithState } from './interacts-with-state.js'
 import { IncomingHttpHeaders, IncomingMessage } from 'node:http'
 import { CookieOptions, HttpContext, HttpMethods, HttpRequest, InteractsWithContentTypes, Protocol, RequestCookieBuilderCallback } from '@supercharge/contracts'
@@ -88,8 +89,8 @@ export class Request extends Many(Macroable, InteractsWithState) implements Http
   /**
    * Returns the request’s query parameters.
    */
-  query (): ParameterBag<string | string[]> {
-    return new ParameterBag<string | string[]>(this.koaCtx.query)
+  query (): QueryParameterBag<string | string[]> {
+    return new QueryParameterBag(this.koaCtx.query)
   }
 
   /**
diff --git a/packages/http/test/request.js b/packages/http/test/request.js
index d3ff8c6a..2bb9d5a0 100644
--- a/packages/http/test/request.js
+++ b/packages/http/test/request.js
@@ -37,6 +37,60 @@ test('request.query() returns the querystring', async () => {
     .expect(200, { name: 'Supercharge', marcus: 'isCool' })
 })
 
+test('request.query().toQuerystring() returns the querystring', async () => {
+  const server = app
+    .make(Server)
+    .use(({ request, response }) => {
+      if (request.query().has('addFoo')) {
+        request.query().set('foo', 'bar')
+      }
+      return response.payload(
+        request.query().toQuerystring()
+      )
+    })
+
+  await Supertest(server.callback())
+    .get('/')
+    .expect(200, '')
+
+  await Supertest(server.callback())
+    .get('/?name=Supercharge&marcus=isCool')
+    .expect(200, 'name=Supercharge&marcus=isCool')
+
+  await Supertest(server.callback())
+    .get('/?addFoo=1&name=Supercharge')
+    .expect(200, 'addFoo=1&name=Supercharge&foo=bar')
+})
+
+test('request.query().toQuerystringDecoded()', async () => {
+  const server = app
+    .make(Server)
+    .use(({ request, response }) => {
+      if (request.query().has('addFoo')) {
+        request.query().set('foo', 'bar')
+      }
+      return response.payload(
+        request.query().toQuerystringDecoded()
+      )
+    })
+
+  await Supertest(server.callback())
+    .get('/')
+    .expect(200, '')
+
+  await Supertest(server.callback())
+    .get('/?name=Supercharge&marcus=isCool')
+    .expect(200, 'name=Supercharge&marcus=isCool')
+
+  await Supertest(server.callback())
+    .get('/?name=Supercharge&marcus[]=isCool&marcus[]=isQuery')
+    .expect(200, 'name=Supercharge&marcus[]=isCool,isQuery')
+
+  await Supertest(server.callback())
+    .get('/?addFoo=1&name=Supercharge')
+    .expect(200, 'addFoo=1&name=Supercharge&foo=bar')
+})
+
 test('request.all() returns merged query params, payload, and files', async () => {
   const server = app
     .make(Server)
@@ -651,6 +705,10 @@ test('querystring', async () => {
   await Supertest(server.callback())
     .get('/?name=Supercharge')
     .expect(200, { querystring: 'name=Supercharge' })
+
+  await Supertest(server.callback())
+    .get('/?name=Supercharge&foo=bar')
+    .expect(200, { querystring: 'name=Supercharge&foo=bar' })
 })
 
 test('fullUrl', async () => {