diff --git a/CHANGELOG.md b/CHANGELOG.md
index 44194435..e65a4ab1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # next release  
 
+# 9.0.1  
+
+Fixes:  
+- Can't compile 9.0.0 version (thanks @Nihisil )  
+
 # 9.0.0  
 
 NOTE: This version is not compatible with previous templates (removed `route.request.params`, `apiConfig.props`, `apiConfig.generic`, `apiConfig.description`, `apiConfig.hasDescription`)  
diff --git a/README.md b/README.md
index f89e04f7..c9a33bff 100644
--- a/README.md
+++ b/README.md
@@ -189,7 +189,8 @@ This option will group your API operations based on their first tag - mirroring
 ## 📄 Mass media  
 
 - [Why Swagger schemes are needed in frontend development ?](https://dev.to/js2me/why-swagger-schemes-are-needed-in-frontend-development-2cb4)  
-- [Migration en douceur vers TypeScript](https://www.premieroctet.com/blog/migration-typescript/)  
+- [Migration en douceur vers TypeScript (French)](https://www.premieroctet.com/blog/migration-typescript/)  
+- [swagger-typescript-api usage (Japanese)](https://zenn.dev/watahaya/articles/2f4a716c47903b)   
 
 ## 🛠️ Contribution  
 
diff --git a/package-lock.json b/package-lock.json
index bd08756d..7c0adb84 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
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+  "version": "9.0.1",
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       "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-4.0.0.tgz",
@@ -1558,12 +1297,6 @@
       "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
       "dev": true
     },
-    "semver": {
-      "version": "5.7.1",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
-      "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
-      "dev": true
-    },
     "semver-compare": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/semver-compare/-/semver-compare-1.0.0.tgz",
@@ -1582,27 +1315,6 @@
       "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc=",
       "dev": true
     },
-    "shebang-command": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-1.2.0.tgz",
-      "integrity": "sha1-RKrGW2lbAzmJaMOfNj/uXer98eo=",
-      "dev": true,
-      "requires": {
-        "shebang-regex": "^1.0.0"
-      }
-    },
-    "shebang-regex": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-1.0.0.tgz",
-      "integrity": "sha1-2kL0l0DAtC2yypcoVxyxkMmO/qM=",
-      "dev": true
-    },
-    "shell-quote": {
-      "version": "1.7.2",
-      "resolved": "https://registry.npmjs.org/shell-quote/-/shell-quote-1.7.2.tgz",
-      "integrity": "sha512-mRz/m/JVscCrkMyPqHc/bczi3OQHkLTqXHEFu0zDhK/qfv3UcOA4SVmRCLmos4bhjr9ekVQubj/R7waKapmiQg==",
-      "dev": true
-    },
     "should": {
       "version": "13.2.3",
       "resolved": "https://registry.npmjs.org/should/-/should-13.2.3.tgz",
@@ -1663,38 +1375,6 @@
       "integrity": "sha512-g9Q1haeby36OSStwb4ntCGGGaKsaVSjQ68fBxoQcutl5fS1vuY18H3wSt3jFyFtrkx+Kz0V1G85A4MyAdDMi2Q==",
       "dev": true
     },
-    "spdx-correct": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.1.0.tgz",
-      "integrity": "sha512-lr2EZCctC2BNR7j7WzJ2FpDznxky1sjfxvvYEyzxNyb6lZXHODmEoJeFu4JupYlkfha1KZpJyoqiJ7pgA1qq8Q==",
-      "dev": true,
-      "requires": {
-        "spdx-expression-parse": "^3.0.0",
-        "spdx-license-ids": "^3.0.0"
-      }
-    },
-    "spdx-exceptions": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/spdx-exceptions/-/spdx-exceptions-2.2.0.tgz",
-      "integrity": "sha512-2XQACfElKi9SlVb1CYadKDXvoajPgBVPn/gOQLrTvHdElaVhr7ZEbqJaRnJLVNeaI4cMEAgVCeBMKF6MWRDCRA==",
-      "dev": true
-    },
-    "spdx-expression-parse": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/spdx-expression-parse/-/spdx-expression-parse-3.0.0.tgz",
-      "integrity": "sha512-Yg6D3XpRD4kkOmTpdgbUiEJFKghJH03fiC1OPll5h/0sO6neh2jqRDVHOQ4o/LMea0tgCkbMgea5ip/e+MkWyg==",
-      "dev": true,
-      "requires": {
-        "spdx-exceptions": "^2.1.0",
-        "spdx-license-ids": "^3.0.0"
-      }
-    },
-    "spdx-license-ids": {
-      "version": "3.0.5",
-      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.5.tgz",
-      "integrity": "sha512-J+FWzZoynJEXGphVIS+XEh3kFSjZX/1i9gFBaWQcB+/tmpe2qUsSBABpcxqxnAxFdiUFEgAX1bjYGQvIZmoz9Q==",
-      "dev": true
-    },
     "string-width": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
@@ -1705,36 +1385,6 @@
         "strip-ansi": "^6.0.0"
       }
     },
-    "string.prototype.padend": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/string.prototype.padend/-/string.prototype.padend-3.1.0.tgz",
-      "integrity": "sha512-3aIv8Ffdp8EZj8iLwREGpQaUZiPyrWrpzMBHvkiSW/bK/EGve9np07Vwy7IJ5waydpGXzQZu/F8Oze2/IWkBaA==",
-      "dev": true,
-      "requires": {
-        "define-properties": "^1.1.3",
-        "es-abstract": "^1.17.0-next.1"
-      }
-    },
-    "string.prototype.trimleft": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/string.prototype.trimleft/-/string.prototype.trimleft-2.1.1.tgz",
-      "integrity": "sha512-iu2AGd3PuP5Rp7x2kEZCrB2Nf41ehzh+goo8TV7z8/XDBbsvc6HQIlUl9RjkZ4oyrW1XM5UwlGl1oVEaDjg6Ag==",
-      "dev": true,
-      "requires": {
-        "define-properties": "^1.1.3",
-        "function-bind": "^1.1.1"
-      }
-    },
-    "string.prototype.trimright": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/string.prototype.trimright/-/string.prototype.trimright-2.1.1.tgz",
-      "integrity": "sha512-qFvWL3/+QIgZXVmJBfpHmxLB7xsUXz6HsUmP8+5dRaC3Q7oKUv9Vo6aMCRZC1smrtyECFsIT30PqBJ1gTjAs+g==",
-      "dev": true,
-      "requires": {
-        "define-properties": "^1.1.3",
-        "function-bind": "^1.1.1"
-      }
-    },
     "strip-ansi": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.0.tgz",
@@ -1743,12 +1393,6 @@
         "ansi-regex": "^5.0.0"
       }
     },
-    "strip-bom": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
-      "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM=",
-      "dev": true
-    },
     "strip-final-newline": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/strip-final-newline/-/strip-final-newline-2.0.0.tgz",
@@ -1815,28 +1459,9 @@
       "dev": true
     },
     "typescript": {
-      "version": "4.1.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.1.3.tgz",
-      "integrity": "sha512-B3ZIOf1IKeH2ixgHhj6la6xdwR9QrLC5d1VKeCSY4tvkqhF2eqd9O7txNlS0PO3GrBAFIdr3L1ndNwteUbZLYg=="
-    },
-    "validate-npm-package-license": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
-      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
-      "dev": true,
-      "requires": {
-        "spdx-correct": "^3.0.0",
-        "spdx-expression-parse": "^3.0.0"
-      }
-    },
-    "which": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
-      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
-      "dev": true,
-      "requires": {
-        "isexe": "^2.0.0"
-      }
+      "version": "4.2.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.2.4.tgz",
+      "integrity": "sha512-V+evlYHZnQkaz8TRBuxTA92yZBPotr5H+WhQ7bD3hZUndx5tGOa1fuCgeSjxAzM1RiN5IzvadIXTVefuuwZCRg=="
     },
     "which-module": {
       "version": "2.0.0",
diff --git a/package.json b/package.json
index 2d58d867..0c6a25c0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "swagger-typescript-api",
-  "version": "9.0.0",
+  "version": "9.0.1",
   "description": "Generate typescript/javascript api from swagger schema",
   "scripts": {
     "cli:json": "node index.js -r -d -p ./swagger-test-cli.json -n swagger-test-cli.ts",
@@ -9,8 +9,8 @@
     "node:debug": "node --nolazy swagger-test-cli/generate.js",
     "contributors": "all-contributors generate",
     "cli:help": "node index.js -h",
-    "test-all": "node ./node_modules/npm-run-all/bin/npm-run-all/index.js generate validate test:*",
-    "test-specific": "node ./node_modules/npm-run-all/bin/npm-run-all/index.js generate validate test:*",
+    "test-all": "node ./scriptsRunner.js generate validate test:*",
+    "test-specific": "node ./scriptsRunner.js generate validate test:*",
     "generate": "node tests/generate.js",
     "generate:debug": "node --nolazy tests/generate.js",
     "validate": "node tests/validate.js",
@@ -46,7 +46,6 @@
     "@types/prettier": "^2.1.6",
     "all-contributors-cli": "^6.19.0",
     "husky": "^4.3.6",
-    "npm-run-all": "^4.1.5",
     "pretty-quick": "^3.1.0"
   },
   "dependencies": {
@@ -62,7 +61,7 @@
     "prettier": "^2.2.1",
     "swagger-schema-official": "2.0.0-bab6bed",
     "swagger2openapi": "^7.0.5",
-    "typescript": "^4.1.3"
+    "typescript": "^4.2.4"
   },
   "bin": {
     "swagger-typescript-api": "index.js",
diff --git a/scriptsRunner.js b/scriptsRunner.js
new file mode 100644
index 00000000..d730f4f7
--- /dev/null
+++ b/scriptsRunner.js
@@ -0,0 +1,48 @@
+const packageJson = require("./package.json");
+const { exec, spawn } = require("child_process");
+
+const commands = process.argv.slice(2);
+
+const packageScripts = Object.keys(packageJson.scripts);
+
+const execute = (scriptName) =>
+  new Promise((resolve, reject) => {
+    console.log(`npm run ${scriptName}`);
+    const spawned = spawn(/^win/.test(process.platform) ? "npm.cmd" : "npm", ["run", scriptName]);
+
+    spawned.stdout.on("data", (data) => {
+      process.stdout.write(data);
+    });
+
+    spawned.stderr.on("data", (data) => {
+      process.stderr.write(data);
+    });
+
+    spawned.on("close", (code) => {
+      if (code) {
+        reject(code);
+      } else {
+        resolve(code);
+      }
+    });
+  });
+
+const run = async () => {
+  for (const scriptName of packageScripts) {
+    for (const command of commands) {
+      if (scriptName === command) {
+        await execute(scriptName);
+      }
+
+      if (command.includes("*")) {
+        const commandPart = command.replace("*", "");
+        // TODO: refactor
+        if (scriptName.startsWith(commandPart) || scriptName.endsWith(commandPart)) {
+          await execute(scriptName);
+        }
+      }
+    }
+  }
+};
+
+run();
diff --git a/templates/base/http-clients/axios-http-client.eta b/templates/base/http-clients/axios-http-client.eta
index b3aa87b2..06ecc0df 100644
--- a/templates/base/http-clients/axios-http-client.eta
+++ b/templates/base/http-clients/axios-http-client.eta
@@ -86,7 +86,7 @@ export class HttpClient<SecurityDataType = unknown> {
 
           const formData = new FormData();
           for (const key in body) {
-            formData.append(key, body[key]);
+            formData.append(key, body[key as keyof typeof body]);
           }
           body = formData;
         }
diff --git a/tests/helpers/validateGeneratedModule.js b/tests/helpers/validateGeneratedModule.js
index 07a5efbd..072c48ca 100644
--- a/tests/helpers/validateGeneratedModule.js
+++ b/tests/helpers/validateGeneratedModule.js
@@ -1,42 +1,66 @@
-const { relative } = require("path");
-const fs = require("fs");
-const tsc = require("typescript");
+const ts = require("typescript");
+const tsconfig = require("../../tsconfig.json");
 
+/** @type {ts.CompilerOptions} */
 const compilerOptions = {
+  allowJs: true,
   noEmitOnError: true,
   noImplicitAny: true,
-  target: tsc.ScriptTarget.ES2018,
-  module: tsc.ModuleKind.CommonJS,
+  target: ts.ScriptTarget.ES2018,
+  module: ts.ModuleKind.CommonJS,
   strict: true,
+  alwaysStrict: true,
+  noEmit: true,
 };
 
-const getDiagnosticsFromPath = (pathToFile) =>
-  tsc.createProgram([pathToFile], compilerOptions).emit(void 0, void 0, void 0, true).diagnostics;
-// TODO: that's faster but return 0 error kind of "Cannot find name ''"
-// tsc.transpileModule(fs.readFileSync(pathToFile).toString(), {
-//   compilerOptions,
-//   reportDiagnostics: true,
-//   moduleName:"TEST",
-//   fileName: relative('', pathToFile),
-// }).diagnostics
+function compile(fileNames) {
+  console.log(`compiling ${fileNames.join(", ")}`);
 
-module.exports = ({ pathToFile }) => {
-  const diagnostics = getDiagnosticsFromPath(pathToFile);
-  const relativePathToFile = relative("", pathToFile);
-
-  console.log(`validating ${relativePathToFile}: errors ${diagnostics.length}`);
-  diagnostics.forEach(({ messageText, file, start }) => {
-    var message = tsc.flattenDiagnosticMessageText(messageText, "\n");
-    if (!file) {
-      console.error(`${relativePathToFile}\r\n`, message);
-      return;
+  let program = ts.createProgram(fileNames, compilerOptions);
+  let emitResult = program.emit();
+
+  let allDiagnostics = ts.getPreEmitDiagnostics(program).concat(emitResult.diagnostics);
+
+  allDiagnostics.forEach((diagnostic) => {
+    if (diagnostic.file) {
+      let { line, character } = ts.getLineAndCharacterOfPosition(diagnostic.file, diagnostic.start);
+      let message = ts.flattenDiagnosticMessageText(diagnostic.messageText, "\n");
+      console.error(`${diagnostic.file.fileName} (${line + 1},${character + 1}): ${message}`);
+    } else {
+      console.error(ts.flattenDiagnosticMessageText(diagnostic.messageText, "\n"));
     }
-    var { line, character } = file.getLineAndCharacterOfPosition(start);
-    console.error(
-      `${relativePathToFile}\r\n`,
-      `${file.fileName} (${line + 1},${character + 1}): ${message}`,
-    );
   });
 
+  let exitCode = allDiagnostics.length || emitResult.emitSkipped ? 1 : 0;
+
+  if (exitCode) {
+    console.log(`Process exiting with code '${exitCode}'.`);
+    process.exit(exitCode);
+  }
+
+  return {
+    code: exitCode,
+    diagnostics: allDiagnostics,
+  };
+}
+
+module.exports = ({ pathToFile }) => {
+  const { diagnostics, code } = compile([pathToFile]);
+  // const relativePathToFile = relative("", pathToFile);
+
+  // console.log(`validating ${relativePathToFile}: errors ${diagnostics.length}`);
+  // diagnostics.forEach(({ messageText, file, start }) => {
+  //   var message = ts.flattenDiagnosticMessageText(messageText, "\n");
+  //   if (!file) {
+  //     console.error(`${relativePathToFile}\r\n`, message);
+  //     return;
+  //   }
+  //   var { line, character } = file.getLineAndCharacterOfPosition(start);
+  //   console.error(
+  //     `${relativePathToFile}\r\n`,
+  //     `${file.fileName} (${line + 1},${character + 1}): ${message}`,
+  //   );
+  // });
+
   return diagnostics;
 };
diff --git a/tests/spec/axios/schema.ts b/tests/spec/axios/schema.ts
index 1819a0b2..f053e121 100644
--- a/tests/spec/axios/schema.ts
+++ b/tests/spec/axios/schema.ts
@@ -1534,7 +1534,7 @@ export class HttpClient<SecurityDataType = unknown> {
 
       const formData = new FormData();
       for (const key in body) {
-        formData.append(key, body[key]);
+        formData.append(key, body[key as keyof typeof body]);
       }
       body = formData;
     }
diff --git a/tests/spec/axiosSingleHttpClient/schema.ts b/tests/spec/axiosSingleHttpClient/schema.ts
index bcdf9855..0e4e36ac 100644
--- a/tests/spec/axiosSingleHttpClient/schema.ts
+++ b/tests/spec/axiosSingleHttpClient/schema.ts
@@ -1534,7 +1534,7 @@ export class HttpClient<SecurityDataType = unknown> {
 
       const formData = new FormData();
       for (const key in body) {
-        formData.append(key, body[key]);
+        formData.append(key, body[key as keyof typeof body]);
       }
       body = formData;
     }
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 00000000..e03c124b
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,11 @@
+{
+  "compilerOptions": {
+    "allowJs": true,
+    "noEmitOnError": true,
+    "noImplicitAny": true,
+    "target": "esnext",
+    "module": "esnext",
+    "strict": true,
+    "noEmit": true
+  }
+}