diff --git a/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/JsonMemberSerVisitor.java b/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/JsonMemberSerVisitor.java
index fdc4b94ba970..b0ef737cdbf5 100644
--- a/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/JsonMemberSerVisitor.java
+++ b/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/JsonMemberSerVisitor.java
@@ -15,12 +15,21 @@
 
 package software.amazon.smithy.aws.typescript.codegen;
 
+import software.amazon.smithy.aws.traits.protocols.AwsQueryCompatibleTrait;
 import software.amazon.smithy.codegen.core.CodegenException;
 import software.amazon.smithy.model.shapes.BigDecimalShape;
 import software.amazon.smithy.model.shapes.BigIntegerShape;
+import software.amazon.smithy.model.shapes.BooleanShape;
+import software.amazon.smithy.model.shapes.DoubleShape;
+import software.amazon.smithy.model.shapes.FloatShape;
+import software.amazon.smithy.model.shapes.IntegerShape;
+import software.amazon.smithy.model.shapes.LongShape;
 import software.amazon.smithy.model.shapes.Shape;
+import software.amazon.smithy.model.shapes.ShortShape;
+import software.amazon.smithy.model.shapes.StringShape;
 import software.amazon.smithy.model.traits.TimestampFormatTrait.Format;
 import software.amazon.smithy.typescript.codegen.TypeScriptDependency;
+import software.amazon.smithy.typescript.codegen.TypeScriptWriter;
 import software.amazon.smithy.typescript.codegen.integration.DocumentMemberSerVisitor;
 import software.amazon.smithy.typescript.codegen.integration.ProtocolGenerator.GenerationContext;
 import software.amazon.smithy.utils.SmithyInternalApi;
@@ -33,14 +42,22 @@
  */
 @SmithyInternalApi
 final class JsonMemberSerVisitor extends DocumentMemberSerVisitor {
+    private final boolean isAwsQueryCompat;
 
     /**
      * @inheritDoc
      */
     JsonMemberSerVisitor(GenerationContext context, String dataSource, Format defaultTimestampFormat) {
         super(context, dataSource, defaultTimestampFormat);
-        context.getWriter().addImport("_json", null, TypeScriptDependency.AWS_SMITHY_CLIENT);
-        this.serdeElisionEnabled = !context.getSettings().generateServerSdk();
+        TypeScriptWriter writer = context.getWriter();
+        writer.addImport("_json", null, TypeScriptDependency.AWS_SMITHY_CLIENT);
+        this.isAwsQueryCompat = context.getService().hasTrait(AwsQueryCompatibleTrait.class);
+        this.serdeElisionEnabled = !this.isAwsQueryCompat && !context.getSettings().generateServerSdk();
+        if (isAwsQueryCompat) {
+            writer.addImport("_toStr", null, AwsDependency.AWS_SDK_CORE);
+            writer.addImport("_toNum", null, AwsDependency.AWS_SDK_CORE);
+            writer.addImport("_toBool", null, AwsDependency.AWS_SDK_CORE);
+        }
     }
 
     @Override
@@ -55,6 +72,69 @@ public String bigIntegerShape(BigIntegerShape shape) {
         return unsupportedShape(shape);
     }
 
+    @Override
+    public String shortShape(ShortShape shape) {
+        String base = super.shortShape(shape);
+        if (isAwsQueryCompat) {
+            return "_toNum(" + base + ")";
+        }
+        return base;
+    }
+
+    @Override
+    public String integerShape(IntegerShape shape) {
+        String base = super.integerShape(shape);
+        if (isAwsQueryCompat) {
+            return "_toNum(" + base + ")";
+        }
+        return base;
+    }
+
+    @Override
+    public String longShape(LongShape shape) {
+        String base = super.longShape(shape);
+        if (isAwsQueryCompat) {
+            return "_toNum(" + base + ")";
+        }
+        return base;
+    }
+
+    @Override
+    public String floatShape(FloatShape shape) {
+        String base = super.floatShape(shape);
+        if (isAwsQueryCompat) {
+            return "_toNum(" + base + ")";
+        }
+        return base;
+    }
+
+    @Override
+    public String doubleShape(DoubleShape shape) {
+        String base = super.doubleShape(shape);
+        if (isAwsQueryCompat) {
+            return "_toNum(" + base + ")";
+        }
+        return base;
+    }
+
+    @Override
+    public String booleanShape(BooleanShape shape) {
+        String base = super.booleanShape(shape);
+        if (isAwsQueryCompat) {
+            return "_toBool(" + base + ")";
+        }
+        return base;
+    }
+
+    @Override
+    public String stringShape(StringShape shape) {
+        String base = super.stringShape(shape);
+        if (isAwsQueryCompat) {
+            return "_toStr(" + base + ")";
+        }
+        return base;
+    }
+
     private String unsupportedShape(Shape shape) {
         throw new CodegenException(String.format("Cannot serialize shape type %s on protocol, shape: %s.",
                 shape.getType(), shape.getId()));
diff --git a/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/JsonRpcProtocolGenerator.java b/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/JsonRpcProtocolGenerator.java
index d70c5db3091b..c962225d717d 100644
--- a/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/JsonRpcProtocolGenerator.java
+++ b/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/JsonRpcProtocolGenerator.java
@@ -66,16 +66,28 @@ protected Format getDocumentTimestampFormat() {
 
     @Override
     protected void generateDocumentBodyShapeSerializers(GenerationContext context, Set<Shape> shapes) {
+        boolean isAwsQueryCompat = context.getService().hasTrait(AwsQueryCompatibleTrait.class);
+
         AwsProtocolUtils.generateDocumentBodyShapeSerde(context, shapes,
-                // AWS JSON does not support jsonName
-                new JsonShapeSerVisitor(context, (shape, name) -> name, enableSerdeElision()));
+            // AWS JSON does not support jsonName
+            new JsonShapeSerVisitor(
+                context,
+                (shape, name) -> name,
+                !isAwsQueryCompat && enableSerdeElision()
+            )
+        );
     }
 
     @Override
     protected void generateDocumentBodyShapeDeserializers(GenerationContext context, Set<Shape> shapes) {
         AwsProtocolUtils.generateDocumentBodyShapeSerde(context, shapes,
-                // AWS JSON does not support jsonName
-                new JsonShapeDeserVisitor(context, (shape, name) -> name, enableSerdeElision()));
+            // AWS JSON does not support jsonName
+            new JsonShapeDeserVisitor(
+                context,
+                (shape, name) -> name,
+                enableSerdeElision()
+            )
+        );
     }
 
     @Override
diff --git a/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/RestJsonProtocolGenerator.java b/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/RestJsonProtocolGenerator.java
index 46bd39448061..f6e4b72aa653 100644
--- a/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/RestJsonProtocolGenerator.java
+++ b/codegen/smithy-aws-typescript-codegen/src/main/java/software/amazon/smithy/aws/typescript/codegen/RestJsonProtocolGenerator.java
@@ -17,6 +17,7 @@
 
 import java.util.List;
 import java.util.Set;
+import software.amazon.smithy.aws.traits.protocols.AwsQueryCompatibleTrait;
 import software.amazon.smithy.aws.typescript.codegen.validation.UnaryFunctionCall;
 import software.amazon.smithy.codegen.core.SymbolProvider;
 import software.amazon.smithy.model.knowledge.HttpBinding;
@@ -69,8 +70,9 @@ protected TimestampFormatTrait.Format getDocumentTimestampFormat() {
 
     @Override
     protected void generateDocumentBodyShapeSerializers(GenerationContext context, Set<Shape> shapes) {
+        boolean isAwsQueryCompat = context.getService().hasTrait(AwsQueryCompatibleTrait.class);
         AwsProtocolUtils.generateDocumentBodyShapeSerde(context, shapes, new JsonShapeSerVisitor(context,
-            (!context.getSettings().generateServerSdk() && enableSerdeElision())));
+            (!context.getSettings().generateServerSdk() && !isAwsQueryCompat && enableSerdeElision())));
     }
 
     @Override
diff --git a/packages/core/src/protocols/coercing-serializers.spec.ts b/packages/core/src/protocols/coercing-serializers.spec.ts
new file mode 100644
index 000000000000..05210d28c019
--- /dev/null
+++ b/packages/core/src/protocols/coercing-serializers.spec.ts
@@ -0,0 +1,76 @@
+import { _toBool, _toNum, _toStr } from "./coercing-serializers";
+
+const consoleWarn = console.warn;
+
+beforeAll(() => {
+  console.warn = () => {};
+});
+
+afterAll(() => {
+  console.warn = consoleWarn;
+});
+
+describe(_toBool.name, () => {
+  it("ignores nullish", () => {
+    expect(_toBool(null)).toBe(null);
+    expect(_toBool(undefined)).toBe(undefined);
+  });
+
+  it("converts strings", () => {
+    expect(_toBool("false")).toEqual(false);
+    expect(_toBool("true")).toEqual(true);
+
+    expect(_toBool("False")).toEqual(false);
+    expect(_toBool("True")).toEqual(true);
+
+    expect(_toBool("")).toEqual(false);
+    expect(_toBool("a")).toEqual(true); // warns
+  });
+
+  it("does not convert numbers", () => {
+    expect(_toBool(0)).toEqual(0);
+    expect(_toBool(1)).toEqual(1);
+  });
+});
+
+describe(_toStr.name, () => {
+  it("ignores nullish", () => {
+    expect(_toStr(null)).toBe(null);
+    expect(_toStr(undefined)).toBe(undefined);
+  });
+
+  it("converts numbers", () => {
+    expect(_toStr(0)).toEqual("0");
+    expect(_toStr(1)).toEqual("1");
+  });
+
+  it("converts booleans", () => {
+    expect(_toStr(false)).toEqual("false");
+    expect(_toStr(true)).toEqual("true");
+  });
+});
+
+describe(_toNum.name, () => {
+  it("ignores nullish", () => {
+    expect(_toNum(null)).toBe(null);
+    expect(_toNum(undefined)).toBe(undefined);
+  });
+
+  it("converts numeric strings", () => {
+    expect(_toNum("1234")).toEqual(1234);
+    expect(_toNum("1234.56")).toEqual(1234.56);
+  });
+
+  it("does not convert prefix-numeric strings", () => {
+    expect(_toNum("1234abc")).toEqual("1234abc");
+    expect(_toNum("1234.56abc")).toEqual("1234.56abc");
+  });
+
+  it("does not convert non-numeric strings", () => {
+    expect(_toNum("abcdef")).toEqual("abcdef");
+  });
+  it("does not convert bools", () => {
+    expect(_toNum(false)).toEqual(false);
+    expect(_toNum(true)).toEqual(true);
+  });
+});
diff --git a/packages/core/src/protocols/coercing-serializers.ts b/packages/core/src/protocols/coercing-serializers.ts
new file mode 100644
index 000000000000..afed47299bfc
--- /dev/null
+++ b/packages/core/src/protocols/coercing-serializers.ts
@@ -0,0 +1,72 @@
+/**
+ * @internal
+ *
+ * Used for awsQueryCompatibility trait.
+ */
+export const _toStr = (val: unknown): string | undefined => {
+  if (val == null) {
+    return val as undefined;
+  }
+  if (typeof val === "number" || typeof val === "bigint") {
+    const warning = new Error(`Received number ${val} where a string was expected.`);
+    warning.name = "Warning";
+    console.warn(warning);
+    return String(val);
+  }
+  if (typeof val === "boolean") {
+    const warning = new Error(`Received boolean ${val} where a string was expected.`);
+    warning.name = "Warning";
+    console.warn(warning);
+    return String(val);
+  }
+  return val as string;
+};
+
+/**
+ * @internal
+ *
+ * Used for awsQueryCompatibility trait.
+ */
+export const _toBool = (val: unknown): boolean | undefined => {
+  if (val == null) {
+    return val as undefined;
+  }
+  if (typeof val === "number") {
+    // transmit to service to be rejected.
+  }
+  if (typeof val === "string") {
+    const lowercase = val.toLowerCase();
+    if (val !== "" && lowercase !== "false" && lowercase !== "true") {
+      const warning = new Error(`Received string "${val}" where a boolean was expected.`);
+      warning.name = "Warning";
+      console.warn(warning);
+    }
+    return val !== "" && lowercase !== "false";
+  }
+  return val as boolean;
+};
+
+/**
+ * @internal
+ *
+ * Used for awsQueryCompatibility trait.
+ */
+export const _toNum = (val: unknown): number | undefined => {
+  if (val == null) {
+    return val as undefined;
+  }
+  if (typeof val === "boolean") {
+    // transmit to service to be rejected.
+  }
+  if (typeof val === "string") {
+    const num = Number(val);
+    if (num.toString() !== val) {
+      const warning = new Error(`Received string "${val}" where a number was expected.`);
+      warning.name = "Warning";
+      console.warn(warning);
+      return val as unknown as undefined;
+    }
+    return num;
+  }
+  return val as number;
+};
diff --git a/packages/core/src/protocols/index.ts b/packages/core/src/protocols/index.ts
index a7355be28f66..c3a1b7cf5d76 100644
--- a/packages/core/src/protocols/index.ts
+++ b/packages/core/src/protocols/index.ts
@@ -1 +1,2 @@
+export * from "./coercing-serializers";
 export * from "./json/awsExpectUnion";