diff --git a/index.ts b/index.ts
index 0d505a1..0af83ee 100644
--- a/index.ts
+++ b/index.ts
@@ -1,4 +1,4 @@
 import { generateCode } from "./src/main";
-export { generateCode, generateCodeByAST, generateCodeWithGenerator } from "./src/main";
+export { generateCode, generateCodeByAST, generateCodeWithGenerator, generateCodeFromData } from "./src/main";
 export { CodeGenerator } from "./src/generators/generator";
 export { TypescriptGenerator } from "./src/generators/typescript/generator";
\ No newline at end of file
diff --git a/src/main.ts b/src/main.ts
index c7cc107..2973bf4 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -9,7 +9,7 @@ import { fillConstructors } from "./astbuilder/fill_constructors";
 import { CodeBuilder } from "./generators/CodeBuilder";
 import { CodeGenerator, CommonGenDeclaration } from "./generators/generator";
 import { TypescriptGenerator } from "./generators/typescript/generator";
-import fs from 'fs'
+import fs from 'fs/promises'
 
 
 export function generateCodeByAST(tree: Program, input: string, getGenerator: (tlbCode: TLBCode) => CodeGenerator) {
@@ -61,25 +61,33 @@ export function generateCodeByAST(tree: Program, input: string, getGenerator: (t
   return generatedCode;
 }
 
-export function generateCodeWithGenerator(inputPath: string, outputPath: string, getGenerator: (tlbCode: TLBCode) => CodeGenerator) {
-  const input = fs.readFileSync(
+function getGenerator(resultLanguage: string) {
+  return (tlbCode: TLBCode) => {
+    if (resultLanguage == 'typescript') {
+      return new TypescriptGenerator(tlbCode)
+    } else {
+      throw new Error(`Result language ${resultLanguage} is not supported`)
+    }
+  }
+}
+
+export async function generateCodeFromData(input: string, resultLanguage: string): Promise<string> {
+  const tree = ast(input)
+  return generateCodeByAST(tree, input, getGenerator(resultLanguage));
+}
+
+export async function generateCodeWithGenerator(inputPath: string, outputPath: string, getGenerator: (tlbCode: TLBCode) => CodeGenerator) {
+  const input = await fs.readFile(
     inputPath,
     'utf-8',
   )
 
   const tree = ast(input)
 
-  fs.writeFile(outputPath, generateCodeByAST(tree, input, getGenerator), () => { });
+  await fs.writeFile(outputPath, generateCodeByAST(tree, input, getGenerator), {});
   console.log(`Generated code is saved to ${outputPath}`);
 }
 
-export function generateCode(inputPath: string, outputPath: string, resultLanguage: string) {
-  let getGenerator = (tlbCode: TLBCode) => {
-    if (resultLanguage == 'typescript') {
-      return new TypescriptGenerator(tlbCode)
-    } else {
-      throw new Error(`Result language ${resultLanguage} is not supported`)
-    }
-  }
-  generateCodeWithGenerator(inputPath, outputPath, getGenerator);
+export async function generateCode(inputPath: string, outputPath: string, resultLanguage: string) {
+  return generateCodeWithGenerator(inputPath, outputPath, getGenerator(resultLanguage));
 }