diff --git a/package.json b/package.json
index b0460b8869ab5..749aa5a4e9c5a 100644
--- a/package.json
+++ b/package.json
@@ -73,6 +73,7 @@
     "@types/jsdom": "20.0.1",
     "@typescript-eslint/eslint-plugin": "5.55.0",
     "@typescript-eslint/parser": "5.55.0",
+    "@wasm-fmt/biome_fmt": "^0.1.12",
     "async": "3.2.4",
     "concurrently": "7.0.0",
     "decomment": "0.9.5",
@@ -138,11 +139,7 @@
     }
   },
   "lint-staged": {
-    "{lib,packages}/**/src/**/*.ts": [
-      "eslint --fix",
-      "prettier --write"
-    ],
-    "**/*.{ts,js,md,json}": "prettier --write"
+    "**/*.{md,json}": "prettier --write"
   },
   "packageManager": "yarn@1.22.22"
 }
diff --git a/scripts/biome-test.mjs b/scripts/biome-test.mjs
new file mode 100644
index 0000000000000..dac7a0a2d4a07
--- /dev/null
+++ b/scripts/biome-test.mjs
@@ -0,0 +1,40 @@
+import init, { format } from "@wasm-fmt/biome_fmt";
+import { promises } from "node:fs";
+import path, { join } from "node:path";
+import { fileURLToPath } from "node:url";
+
+import walk from "./utils/walk.js";
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+await init();
+
+const prettifyCode = async (dir) => {
+  for await (const file of walk(dir, ["node_modules"])) {
+    if (file.endsWith(".ts") || file.endsWith(".js")) {
+      if (file.endsWith("ruleset.ts")) {
+        continue;
+      }
+      promises.readFile(file, "utf-8").then((contents) => {
+        promises.writeFile(
+          file,
+          format(contents, file, {
+            indent_style: "space",
+            indent_width: 2,
+            line_width: 120,
+            line_ending: "lf",
+            quote_properties: "as-needed",
+            arrow_parentheses: "always",
+            semicolons: "always",
+            bracket_spacing: true,
+            bracket_same_line: false,
+            quote_style: "double",
+            trailing_comma: "all",
+          }),
+          "utf-8"
+        );
+      });
+    }
+  }
+};
+
+prettifyCode(join(__dirname, "..", "clients", "client-s3"));
diff --git a/scripts/generate-clients/code-eslint-fix.js b/scripts/generate-clients/code-eslint-fix.js
index 5aaa8933d53c0..08dd82908f207 100644
--- a/scripts/generate-clients/code-eslint-fix.js
+++ b/scripts/generate-clients/code-eslint-fix.js
@@ -1,19 +1,5 @@
-// @ts-check
-const { spawnProcess } = require("../utils/spawn-process");
-const path = require("path");
-
 const eslintFixCode = async () => {
-  try {
-    await spawnProcess(path.join(__dirname, "..", "..", "node_modules", ".bin", "esprint"), [
-      "check",
-      "--fix",
-      "--quiet",
-    ]);
-  } catch (error) {
-    // esprint throws error as the clients source code does not follow 'prefer-const' rule.
-    // And esprint does not have a way to override rules written in .eslintrc
-    // We will still get linted code though.
-  }
+  // superceded by biome.
 };
 
 module.exports = {
diff --git a/scripts/generate-clients/code-prettify.js b/scripts/generate-clients/code-prettify.js
deleted file mode 100644
index 610442509d0ff..0000000000000
--- a/scripts/generate-clients/code-prettify.js
+++ /dev/null
@@ -1,18 +0,0 @@
-// @ts-check
-const { spawnProcess } = require("../utils/spawn-process");
-const path = require("path");
-
-const prettifyCode = async (dir) => {
-  await spawnProcess(path.join(__dirname, "..", "..", "node_modules", ".bin", "pprettier"), [
-    "--write",
-    `${dir}/*/typescript-codegen/**/*.{ts,js,md,json}`,
-  ]);
-  await spawnProcess(path.join(__dirname, "..", "..", "node_modules", ".bin", "pprettier"), [
-    "--write",
-    `${dir}/*/typescript-ssdk-codegen/**/*.{ts,js,md,json}`,
-  ]);
-};
-
-module.exports = {
-  prettifyCode,
-};
diff --git a/scripts/generate-clients/code-prettify.mjs b/scripts/generate-clients/code-prettify.mjs
new file mode 100644
index 0000000000000..772174aec19dd
--- /dev/null
+++ b/scripts/generate-clients/code-prettify.mjs
@@ -0,0 +1,19 @@
+import init from "@wasm-fmt/biome_fmt";
+import fs from "node:fs";
+import path from "node:path";
+
+import { runWasmFmtBiome } from "./run-wasm-fmt-biome.mjs";
+
+export const prettifyCode = async (dir) => {
+  await init();
+
+  for (const subdirectory of fs.readdirSync(dir)) {
+    const targets = [path.join(subdirectory, "typescript-codegen"), path.join(subdirectory, "typescript-ssdk-codegen")];
+
+    for (const target of targets) {
+      if (fs.existsSync(target) && fs.lstatSync(target).isDirectory()) {
+        runWasmFmtBiome(target);
+      }
+    }
+  }
+};
diff --git a/scripts/generate-clients/generic.js b/scripts/generate-clients/generic.js
index d6a7dd7cd3513..dff92217258ec 100644
--- a/scripts/generate-clients/generic.js
+++ b/scripts/generate-clients/generic.js
@@ -4,13 +4,13 @@ const { emptyDirSync } = require("fs-extra");
 const { generateGenericClient } = require("./code-gen");
 const { copyToClients } = require("./copy-to-clients");
 const { CODE_GEN_GENERIC_CLIENT_OUTPUT_DIR } = require("./code-gen-dir");
-const { prettifyCode } = require("./code-prettify");
 const { eslintFixCode } = require("./code-eslint-fix");
 
 const PRIVATE_CLIENTS_DIR = path.normalize(path.join(__dirname, "..", "..", "private"));
 
 // TODO: remove this script when generate-clients code is refactored.
 (async () => {
+  const { prettifyCode } = await import("./code-prettify.mjs");
   try {
     await generateGenericClient();
 
diff --git a/scripts/generate-clients/index.js b/scripts/generate-clients/index.js
index 564e84f8cf195..93c2b53241b68 100644
--- a/scripts/generate-clients/index.js
+++ b/scripts/generate-clients/index.js
@@ -12,7 +12,6 @@ const {
   DEFAULT_CODE_GEN_INPUT_DIR,
   TEMP_CODE_GEN_INPUT_DIR,
 } = require("./code-gen-dir");
-const { prettifyCode } = require("./code-prettify");
 const { eslintFixCode } = require("./code-eslint-fix");
 const { buildSmithyTypeScript } = require("./build-smithy-typescript");
 const { SMITHY_TS_COMMIT } = require("./config");
@@ -75,6 +74,7 @@ const {
   .help().argv;
 
 (async () => {
+  const { prettifyCode } = await import("./code-prettify.mjs");
   try {
     if (!noSmithyCheckout) {
       await buildSmithyTypeScript(repo, commit);
diff --git a/scripts/generate-clients/run-wasm-fmt-biome.mjs b/scripts/generate-clients/run-wasm-fmt-biome.mjs
new file mode 100644
index 0000000000000..6ea3d44b4555b
--- /dev/null
+++ b/scripts/generate-clients/run-wasm-fmt-biome.mjs
@@ -0,0 +1,35 @@
+import init, { format } from "@wasm-fmt/biome_fmt";
+import { promises } from "node:fs";
+
+import walk from "../utils/walk.js";
+
+await init();
+
+export const runWasmFmtBiome = async (dir) => {
+  for await (const file of walk(dir)) {
+    if (file.endsWith(".ts") || file.endsWith(".js")) {
+      if (file.endsWith("ruleset.ts")) {
+        continue;
+      }
+      promises.readFile(file, "utf-8").then((contents) => {
+        promises.writeFile(
+          file,
+          format(contents, file, {
+            indent_style: "space",
+            indent_width: 2,
+            line_width: 120,
+            line_ending: "lf",
+            quote_properties: "as-needed",
+            arrow_parentheses: "always",
+            semicolons: "always",
+            bracket_spacing: true,
+            bracket_same_line: false,
+            quote_style: "double",
+            trailing_comma: "all",
+          }),
+          "utf-8"
+        );
+      });
+    }
+  }
+};
diff --git a/scripts/generate-clients/single-service.js b/scripts/generate-clients/single-service.js
index e4f82a48ba320..4636b45a4b7ad 100644
--- a/scripts/generate-clients/single-service.js
+++ b/scripts/generate-clients/single-service.js
@@ -3,7 +3,6 @@ const { normalize, join } = require("path");
 const { generateClient } = require("./code-gen");
 const { codeOrdering } = require("./code-ordering");
 const { copyToClients } = require("./copy-to-clients");
-const { spawnProcess } = require("../utils/spawn-process");
 
 const SDK_CLIENTS_DIR = normalize(join(__dirname, "..", "..", "clients"));
 
@@ -34,28 +33,15 @@ const { solo } = yargs(process.argv.slice(2))
     require("../api-examples/get-examples");
     require("../api-examples/merge-examples").merge(void 0, solo);
 
-    console.log("================ starting eslint ================", "\n", new Date().toString(), solo);
-    try {
-      await spawnProcess("npx", ["eslint", "--quiet", "--fix", `${clientFolder}/src/**/*`]);
-    } catch (ignored) {}
+    console.log("================ starting wasm-fmt biome ================", "\n", new Date().toString(), solo);
 
-    if (solo === "dynamodb") {
-      try {
-        await spawnProcess("npx", ["eslint", "--quiet", "--fix", `${libFolder}/src/**/*`]);
-      } catch (ignored) {}
-    }
+    const target = `${clientFolder}/src`;
+    const { runWasmFmtBiome } = await import("./run-wasm-fmt-biome.mjs");
+    runWasmFmtBiome(target);
 
-    console.log("================ starting prettier ================", "\n", new Date().toString(), solo);
-    await spawnProcess("npx", [
-      "prettier",
-      "--write",
-      "--loglevel",
-      "warn",
-      `${clientFolder}/src/**/*.{md,js,ts,json}`,
-    ]);
-    await spawnProcess("npx", ["prettier", "--write", "--loglevel", "warn", `${clientFolder}/README.md`]);
     if (solo === "dynamodb") {
-      await spawnProcess("npx", ["prettier", "--write", "--loglevel", "warn", `${libFolder}/src/**/*.{md,js,ts,json}`]);
+      const target = `${libFolder}/src`;
+      runWasmFmtBiome(target);
     }
 
     const compress = require("../endpoints-ruleset/compress");
diff --git a/yarn.lock b/yarn.lock
index 5c0b0a0276059..234efaa846470 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4016,6 +4016,11 @@
     loupe "^2.3.6"
     pretty-format "^29.5.0"
 
+"@wasm-fmt/biome_fmt@^0.1.12":
+  version "0.1.12"
+  resolved "https://registry.yarnpkg.com/@wasm-fmt/biome_fmt/-/biome_fmt-0.1.12.tgz#11f239b03b19be9a755006c77183722246c8dfbc"
+  integrity sha512-2t7UdDh9sQ4JCXLXHfJeeqmeRcijbbgmLQ69sREWuYU7nMp8R/4F9g4bIEvJVvWmA4sNmPRvPJW/i3s5lDS11A==
+
 "@webassemblyjs/ast@1.11.1":
   version "1.11.1"
   resolved "https://registry.npmjs.org/@webassemblyjs/ast/-/ast-1.11.1.tgz"