diff --git a/README.md b/README.md
index 3bd7e19f3..4380f04d1 100644
--- a/README.md
+++ b/README.md
@@ -64,11 +64,11 @@ const snippet = new HTTPSnippet({
 });
 
 // generate Node.js: Native output
-console.log(await snippet.convert('node'));
+console.log(snippet.convert('node'));
 
 // generate Node.js: Native output, indent with tabs
 console.log(
-  await snippet.convert('node', {
+  snippet.convert('node', {
     indent: '\t',
   }),
 );
@@ -104,13 +104,13 @@ const snippet = new HTTPSnippet({
 
 // generate Shell: cURL output
 console.log(
-  await snippet.convert('shell', 'curl', {
+  snippet.convert('shell', 'curl', {
     indent: '\t',
   }),
 );
 
 // generate Node.js: Unirest output
-console.log(await snippet.convert('node', 'unirest'));
+console.log(snippet.convert('node', 'unirest'));
 ```
 
 ### addTarget(target)
diff --git a/package-lock.json b/package-lock.json
index e77d930f7..53eb973e5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,6 @@
       "version": "8.1.4",
       "license": "MIT",
       "dependencies": {
-        "formdata-to-string": "^2.0.2",
         "qs": "^6.11.2",
         "stringify-object": "^3.3.0"
       },
@@ -3871,14 +3870,6 @@
         "is-callable": "^1.1.3"
       }
     },
-    "node_modules/formdata-to-string": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/formdata-to-string/-/formdata-to-string-2.0.2.tgz",
-      "integrity": "sha512-OxurQikLgzU3+AhBCb2Or7pV2+dQWMSi1r4ZmhGMZ/WxVLOfUCqB2hqK5EwTGSzN9O/dx9uw5Mln/vtG1t0XbQ==",
-      "engines": {
-        "node": ">=18"
-      }
-    },
     "node_modules/fs.realpath": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
diff --git a/package.json b/package.json
index 71bde5ee3..9ae9b0d96 100644
--- a/package.json
+++ b/package.json
@@ -80,7 +80,6 @@
     "test": "vitest run --coverage"
   },
   "dependencies": {
-    "formdata-to-string": "^2.0.2",
     "qs": "^6.11.2",
     "stringify-object": "^3.3.0"
   },
diff --git a/src/fixtures/runCustomFixtures.ts b/src/fixtures/runCustomFixtures.ts
index ac31a783a..faf323aa5 100644
--- a/src/fixtures/runCustomFixtures.ts
+++ b/src/fixtures/runCustomFixtures.ts
@@ -31,7 +31,7 @@ export const runCustomFixtures = ({ targetId, clientId, tests }: CustomFixture)
       }
 
       const snippet = new HTTPSnippet(request, opts);
-      const result = await snippet.convert(targetId, clientId, options);
+      const result = snippet.convert(targetId, clientId, options);
       const filePath = path.join(__dirname, '..', 'targets', targetId, clientId, 'fixtures', fixtureFile);
       if (process.env.OVERWRITE_EVERYTHING) {
         writeFileSync(filePath, String(result));
diff --git a/src/index.test.ts b/src/index.test.ts
index 808a78b82..a5171621c 100644
--- a/src/index.test.ts
+++ b/src/index.test.ts
@@ -10,24 +10,24 @@ import short from './fixtures/requests/short.cjs';
 import { HTTPSnippet } from './index.js';
 
 describe('HTTPSnippet', () => {
-  it('should return false if no matching target', async () => {
+  it('should return false if no matching target', () => {
     const snippet = new HTTPSnippet(short.log.entries[0].request as Request);
 
     // @ts-expect-error intentionally incorrect
-    const result = await snippet.convert(null);
+    const result = snippet.convert(null);
 
     expect(result).toBe(false);
   });
 
   describe('repair malformed `postData`', () => {
-    it('should repair a HAR with an empty `postData` object', async () => {
+    it('should repair a HAR with an empty `postData` object', () => {
       const snippet = new HTTPSnippet({
         method: 'POST',
         url: 'https://httpbin.org/anything',
         postData: {},
       } as Request);
 
-      await snippet.convert('node');
+      snippet.convert('node');
 
       const request = snippet.requests[0];
       expect(request.postData).toStrictEqual({
@@ -35,7 +35,7 @@ describe('HTTPSnippet', () => {
       });
     });
 
-    it('should repair a HAR with a `postData` params object missing `mimeType`', async () => {
+    it('should repair a HAR with a `postData` params object missing `mimeType`', () => {
       // @ts-expect-error Testing a malformed HAR case.
       const snippet = new HTTPSnippet({
         method: 'POST',
@@ -44,7 +44,7 @@ describe('HTTPSnippet', () => {
           params: [],
         },
       } as Request);
-      await snippet.convert('node');
+      snippet.convert('node');
 
       const request = snippet.requests[0];
       expect(request.postData).toStrictEqual({
@@ -53,7 +53,7 @@ describe('HTTPSnippet', () => {
       });
     });
 
-    it('should repair a HAR with a `postData` text object missing `mimeType`', async () => {
+    it('should repair a HAR with a `postData` text object missing `mimeType`', () => {
       const snippet = new HTTPSnippet({
         method: 'POST',
         url: 'https://httpbin.org/anything',
@@ -61,7 +61,7 @@ describe('HTTPSnippet', () => {
           text: '',
         },
       } as Request);
-      await snippet.convert('node');
+      snippet.convert('node');
 
       const request = snippet.requests[0];
       expect(request.postData).toStrictEqual({
@@ -71,7 +71,7 @@ describe('HTTPSnippet', () => {
     });
   });
 
-  it('should parse HAR file with multiple entries', async () => {
+  it('should parse HAR file with multiple entries', () => {
     const snippet = new HTTPSnippet({
       log: {
         version: '1.2',
@@ -96,7 +96,7 @@ describe('HTTPSnippet', () => {
       },
     });
 
-    await snippet.convert('node');
+    snippet.convert('node');
 
     expect(snippet).toHaveProperty('requests');
     expect(Array.isArray(snippet.requests)).toBeTruthy();
@@ -136,18 +136,18 @@ describe('HTTPSnippet', () => {
     ] as {
       expected: string;
       input: keyof typeof mimetypes;
-    }[])('mimetype conversion of $input to $output', async ({ input, expected }) => {
+    }[])('mimetype conversion of $input to $output', ({ input, expected }) => {
       const snippet = new HTTPSnippet(mimetypes[input]);
-      await snippet.convert('node');
+      snippet.convert('node');
 
       const request = snippet.requests[0];
       expect(request.postData.mimeType).toStrictEqual(expected);
     });
   });
 
-  it('should set postData.text to empty string when postData.params is undefined in application/x-www-form-urlencoded', async () => {
+  it('should set postData.text to empty string when postData.params is undefined in application/x-www-form-urlencoded', () => {
     const snippet = new HTTPSnippet(mimetypes['application/x-www-form-urlencoded']);
-    await snippet.convert('node');
+    snippet.convert('node');
 
     const request = snippet.requests[0];
     expect(request.postData.text).toBe('');
@@ -155,9 +155,9 @@ describe('HTTPSnippet', () => {
 
   describe('requestExtras', () => {
     describe('uriObj', () => {
-      it('should add uriObj', async () => {
+      it('should add uriObj', () => {
         const snippet = new HTTPSnippet(query.log.entries[0].request as Request);
-        await snippet.convert('node');
+        snippet.convert('node');
 
         const request = snippet.requests[0];
 
@@ -181,9 +181,9 @@ describe('HTTPSnippet', () => {
         });
       });
 
-      it('should fix the `path` property of uriObj to match queryString', async () => {
+      it('should fix the `path` property of uriObj to match queryString', () => {
         const snippet = new HTTPSnippet(query.log.entries[0].request as Request);
-        await snippet.convert('node');
+        snippet.convert('node');
 
         const request = snippet.requests[0];
         expect(request.uriObj.path).toBe('/anything?foo=bar&foo=baz&baz=abc&key=value');
@@ -191,9 +191,9 @@ describe('HTTPSnippet', () => {
     });
 
     describe('queryObj', () => {
-      it('should add queryObj', async () => {
+      it('should add queryObj', () => {
         const snippet = new HTTPSnippet(query.log.entries[0].request as Request);
-        await snippet.convert('node');
+        snippet.convert('node');
 
         const request = snippet.requests[0];
         expect(request.queryObj).toMatchObject({ baz: 'abc', key: 'value', foo: ['bar', 'baz'] });
@@ -201,9 +201,9 @@ describe('HTTPSnippet', () => {
     });
 
     describe('headersObj', () => {
-      it('should add headersObj', async () => {
+      it('should add headersObj', () => {
         const snippet = new HTTPSnippet(headers.log.entries[0].request as Request);
-        await snippet.convert('node');
+        snippet.convert('node');
 
         const request = snippet.requests[0];
         expect(request.headersObj).toMatchObject({
@@ -212,7 +212,7 @@ describe('HTTPSnippet', () => {
         });
       });
 
-      it('should add headersObj to source object case insensitive when HTTP/1.0', async () => {
+      it('should add headersObj to source object case insensitive when HTTP/1.0', () => {
         const snippet = new HTTPSnippet({
           ...headers.log.entries[0].request,
           httpVersion: 'HTTP/1.1',
@@ -225,7 +225,7 @@ describe('HTTPSnippet', () => {
           ],
         } as Request);
 
-        await snippet.convert('node');
+        snippet.convert('node');
 
         const request = snippet.requests[0];
 
@@ -236,7 +236,7 @@ describe('HTTPSnippet', () => {
         });
       });
 
-      it('should add headersObj to source object lowercased when HTTP/2.x', async () => {
+      it('should add headersObj to source object lowercased when HTTP/2.x', () => {
         const snippet = new HTTPSnippet({
           ...headers.log.entries[0].request,
           httpVersion: 'HTTP/2',
@@ -249,7 +249,7 @@ describe('HTTPSnippet', () => {
           ],
         } as Request);
 
-        await snippet.convert('node');
+        snippet.convert('node');
 
         const request = snippet.requests[0];
 
@@ -262,9 +262,9 @@ describe('HTTPSnippet', () => {
     });
 
     describe('url', () => {
-      it('should modify the original url to strip query string', async () => {
+      it('should modify the original url to strip query string', () => {
         const snippet = new HTTPSnippet(query.log.entries[0].request as Request);
-        await snippet.convert('node');
+        snippet.convert('node');
 
         const request = snippet.requests[0];
         expect(request.url).toBe('https://httpbin.org/anything');
@@ -272,9 +272,9 @@ describe('HTTPSnippet', () => {
     });
 
     describe('fullUrl', () => {
-      it('adds fullURL', async () => {
+      it('adds fullURL', () => {
         const snippet = new HTTPSnippet(query.log.entries[0].request as Request);
-        await snippet.convert('node');
+        snippet.convert('node');
 
         const request = snippet.requests[0];
         expect(request.fullUrl).toBe('https://httpbin.org/anything?foo=bar&foo=baz&baz=abc&key=value');
diff --git a/src/index.ts b/src/index.ts
index 763e94ac0..040507da3 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -5,7 +5,6 @@ import type { UrlWithParsedQuery } from 'node:url';
 
 import { format as urlFormat, parse as urlParse } from 'node:url';
 
-import formDataToString from 'formdata-to-string';
 import { stringify as queryStringify } from 'qs';
 
 import { getHeaderName } from './helpers/headers.js';
@@ -100,12 +99,10 @@ export class HTTPSnippet {
     }
   }
 
-  async init() {
+  init() {
     this.initCalled = true;
 
-    const promises: Promise<Request>[] = [];
-
-    this.entries.forEach(({ request }) => {
+    this.requests = this.entries.map(({ request }) => {
       // add optional properties to make validation successful
       const req = {
         bodySize: 0,
@@ -125,15 +122,13 @@ export class HTTPSnippet {
         req.postData.mimeType = 'application/octet-stream';
       }
 
-      promises.push(this.prepare(req as HarRequest, this.options));
+      return this.prepare(req as HarRequest, this.options);
     });
 
-    this.requests = await Promise.all(promises);
-
     return this;
   }
 
-  async prepare(harRequest: HarRequest, options: HTTPSnippetOptions) {
+  prepare(harRequest: HarRequest, options: HTTPSnippetOptions) {
     const request: Request = {
       ...harRequest,
       fullUrl: '',
@@ -195,24 +190,36 @@ export class HTTPSnippet {
         request.postData.mimeType = 'multipart/form-data';
 
         if (request.postData?.params) {
-          const form = new FormData();
+          const boundary = '---011000010111000001101001'; // this is binary for "api" (easter egg)
+          const carraige = `${boundary}--`;
+          const rn = '\r\n';
 
-          request.postData?.params.forEach(param => {
+          const payload = [`--${boundary}`];
+          request.postData?.params.forEach((param, i) => {
             const name = param.name;
             const value = param.value || '';
             const filename = param.fileName || null;
             const contentType = param.contentType || '';
 
             if (filename) {
-              form.append(name, new Blob([value], { type: contentType }), filename);
+              payload.push(`Content-Disposition: form-data; name="${name}"; filename="${filename}"`);
+              payload.push(`Content-Type: ${contentType}`);
             } else {
-              form.append(name, value);
+              payload.push(`Content-Disposition: form-data; name="${name}"`);
+            }
+
+            payload.push('');
+            payload.push(value);
+
+            if (i !== (request.postData.params as Param[]).length - 1) {
+              payload.push(`--${boundary}`);
             }
           });
 
-          const boundary = '---011000010111000001101001'; // this is binary for "api" (easter egg)
+          payload.push(`--${carraige}`);
+
           request.postData.boundary = boundary;
-          request.postData.text = await formDataToString(form, { boundary });
+          request.postData.text = payload.join(rn);
 
           // Since headers are case-sensitive we need to see if there's an existing `Content-Type` header that we can override.
           const contentTypeHeader = getHeaderName(request.headersObj, 'content-type') || 'content-type';
@@ -305,9 +312,9 @@ export class HTTPSnippet {
     };
   }
 
-  async convert(targetId: TargetId, clientId?: ClientId, options?: any) {
+  convert(targetId: TargetId, clientId?: ClientId, options?: any) {
     if (!this.initCalled) {
-      await this.init();
+      this.init();
     }
 
     if (!options && clientId) {
diff --git a/src/targets/index.test.ts b/src/targets/index.test.ts
index 4f3f66b28..e2e3d231d 100644
--- a/src/targets/index.test.ts
+++ b/src/targets/index.test.ts
@@ -64,7 +64,7 @@ describe('request validation', () => {
       (clientId, { extname: fixtureExtension }) => {
         it.each(fixtures.filter(testFilter(0, fixtureFilter)))(
           'request should match fixture for "%s.js"',
-          async (fixture, request) => {
+          (fixture, request) => {
             const expectedPath = path.join(
               'src',
               'targets',
@@ -88,7 +88,7 @@ describe('request validation', () => {
               expected = readFileSync(expectedPath).toString();
               const snippet = new HTTPSnippet(request, options);
 
-              result = await snippet.convert(targetId, clientId);
+              result = snippet.convert(targetId, clientId);
 
               if (OVERWRITE_EVERYTHING && result) {
                 writeFileSync(expectedPath, String(result));
@@ -295,7 +295,7 @@ describe('addTargetClient', () => {
     delete targets.node.clientsById.custom;
   });
 
-  it('should add a new custom target', async () => {
+  it('should add a new custom target', () => {
     const customClient: Client = {
       info: {
         key: 'custom',
@@ -313,7 +313,7 @@ describe('addTargetClient', () => {
 
     const snippet = new HTTPSnippet(short.log.entries[0].request as Request, {});
 
-    const result = await snippet.convert('node', 'custom');
+    const result = snippet.convert('node', 'custom');
 
     expect(result).toBe('This was generated from a custom client.');
   });
@@ -324,7 +324,7 @@ describe('addClientPlugin', () => {
     delete targets.node.clientsById.custom;
   });
 
-  it('should add a new custom target', async () => {
+  it('should add a new custom target', () => {
     const customPlugin: ClientPlugin = {
       target: 'node',
       client: {
@@ -345,7 +345,7 @@ describe('addClientPlugin', () => {
 
     const snippet = new HTTPSnippet(short.log.entries[0].request as Request, {});
 
-    const result = await snippet.convert('node', 'custom');
+    const result = snippet.convert('node', 'custom');
 
     expect(result).toBe('This was generated from a custom client.');
   });