diff --git a/.gitignore b/.gitignore
index 08a5e7b..a0553cf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,4 @@
 .dccache
-testf.txt
 
 # Logs
 logs
diff --git a/TODOs.md b/TODOs.md
index 95df7fe..fbbbf96 100644
--- a/TODOs.md
+++ b/TODOs.md
@@ -1,5 +1,4 @@
 - [ ] Tests
-- [ ] Test Coverage
 - [X] GET
 - [X] HEAD
 - [X] OPTIONS
@@ -7,9 +6,8 @@
 - [X] POST
 - [X] DELETE
 - [X] PATCH
-- [ ] optional errors
-- [ ] upload api (https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequestUpload)
-- [ ] FormData (https://developer.mozilla.org/en-US/docs/Web/API/FormData)
+- [X] upload api (https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequestUpload)
+- [X] FormData (https://developer.mozilla.org/en-US/docs/Web/API/FormData)
 - [ ] Fetch support
-- [ ] Data (req.body)
+- [X] Data (req.body)
 - [ ] options.easyMode -> doesn't pretend to be a primitive
\ No newline at end of file
diff --git a/src/main.ts b/src/main.ts
index 610ab7b..223d0db 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -214,6 +214,29 @@ interface RequestOptions {
         username?: string | null,
         password?: string | null
     },
+
+    /**
+     * Here you can optionally provide event handlers fo file uploads
+     */
+    upload?: {
+        /**
+         * An event handler function which is called at the beginning of a file upload
+         * @param total Total file size in bytes
+         */
+        start?(total: number): void,
+        /**
+         * An event handler function which is called everytime upload progress was made
+         * @param percentage A number between 0 and 1 indicating how much progress was already made
+         * @param loaded Already uploaded bytes
+         * @param total Total file size in bytes
+         */
+        progress?(percentage: number, loaded: number, total: number): void,
+        /**
+         * An event handler function which is called at the end of a file upload
+         * @param success Indicates whether the upload was sucessful or not
+         */
+        end?(success: boolean): void
+    }
 }
 
 type HTTPMethod = 'GET' | 'POST' | 'HEAD' | 'OPTIONS' | 'PUT' | 'DELETE' | 'PATCH' | 'CONNECT' | 'TRACE'
@@ -370,6 +393,34 @@ type HTTPMethod = 'GET' | 'POST' | 'HEAD' | 'OPTIONS' | 'PUT' | 'DELETE' | 'PATC
             resolve(response)
         })
 
+        // Upload API
+        if (typeof options.upload === 'object') {
+            if (typeof options.upload.start === 'function') {
+                xhr.upload.addEventListener('loadstart', (ev) => {
+                    if (ev.lengthComputable) {
+                        // @ts-expect-error: No it's not
+                        options.upload.start(ev.total)
+                    }
+                })
+            }
+
+            if (typeof options.upload.progress === 'function') {
+                xhr.upload.addEventListener('progress', (ev) => {
+                    if (ev.lengthComputable) {
+                        // @ts-expect-error: No it's not
+                        options.upload.progress(ev.loaded / ev.total, ev.loaded, ev.total)
+                    }
+                })
+            }
+
+            if (typeof options.upload.end === 'function') {
+                xhr.upload.addEventListener('loadend', (ev) => {
+                    // @ts-expect-error: No it's not
+                    options.upload.end(ev.loaded !== 0)
+                })
+            }
+        }
+
         // Open request
         xhr.open(method, url, true)
 
diff --git a/test/endpoints.js b/test/endpoints.js
index 3e9943e..677e28b 100644
--- a/test/endpoints.js
+++ b/test/endpoints.js
@@ -127,13 +127,16 @@ export default function applyRoutes(app, fn = () => {}) {
 
                 fstream.on('close', () => {
                     console.log('Uploaded file')
+                    const fcontent = fs.readFileSync(path.join(__dirname, 'file.txt'), {
+                        encoding: 'utf8'
+                    })
+                    fs.rmSync(path.join(__dirname, 'file.txt'))
+                    res.json(fcontent.includes('TRUE'))
                 })
         })
 
         req.busboy.on('finish', () => {
-            const fcontent = fs.readFileSync(path.join(__dirname, 'file.txt')).toString('utf8')
-            fs.rmSync(path.join(__dirname, 'file.txt'))
-            res.json(fcontent.includes('TRUE'))
+            
         })
 
         req.pipe(req.busboy)
diff --git a/test/test.html b/test/test.html
index 1bc9076..a5e6e97 100644
--- a/test/test.html
+++ b/test/test.html
@@ -20,6 +20,10 @@ <h2 id="teststat"></h2>
 
     <script src="./test-engine.js"></script>
 
+    <form>
+        <input type="file" name="file" id="file">
+    </form>
+
     <script type="module">
         import * as knorryObj from './knorry.js'
         import { get, defineKnorryOptions, post, useFetch, put, head, del, options, patch } from './knorry.js'
@@ -252,20 +256,39 @@ <h2 id="teststat"></h2>
                 })).worked === 'true'
             }).as('.post() with implicit FormData()')
             // TODO: Test file upload using formData
-            /*
-                Like this i guess?!
-                (async () => {
-                  const browser = await puppeteer.launch();
-                  const page = await browser.newPage();
+            setTimeout(async () => {
+                expect(async () => {
+                    const formData = new FormData()
+                    formData.append('file', document.querySelector('input[name="file"]').files[0])
+                    const result = (await post('/upload-file', formData)).$plain()
+
+                    expect(async () => {
+                        const formData = new FormData()
+                        formData.append('file', document.querySelector('input[name="file"]').files[0])
+                        let sfc = false
+                        let pfc = false
+                        let efc = false
 
-                  await page.goto('http://example.com');
+                        const req = await post('/upload-file', formData, {
+                            upload: {
+                                start: (totalFileSize) => {
+                                    sfc = !!totalFileSize
+                                },
+                                progress: (percentage, loaded, total) => {
+                                    pfc = percentage > 0.1
+                                },
+                                end: (success) => {
+                                    efc = success
+                                }
+                            }
+                        })
 
-                  const fileInput = await page.$('input[type="file"]');
-                  await fileInput.uploadFile('/path/to/testf.txt');
+                        return req.$plain() && sfc && pfc && efc
+                    }).as('FormData File upload with Upload Features')
 
-                  await browser.close();
-                })();
-            */
+                    return result
+                }).as('FormData File upload')
+            }, 1000)
         }, 3000)
     </script>
 </body>
diff --git a/test/test.js b/test/test.js
index 3035e4b..8fb8bcf 100644
--- a/test/test.js
+++ b/test/test.js
@@ -67,6 +67,8 @@ app.listen(4560, async () => {
     })
     const page = await browser.newPage()
     await page.goto(`http://localhost:4560`)
+    const fileInput = await page.$('input[type="file"]')
+    await fileInput.uploadFile(path.join(__dirname, '..', 'testf.txt'))
 
     global.printFullLogs = async () => {
         console.log(chalk.cyan('Full log:'))
diff --git a/testf.txt b/testf.txt
new file mode 100644
index 0000000..4a94e07
--- /dev/null
+++ b/testf.txt
@@ -0,0 +1 @@
+!TRUE!TEST!
\ No newline at end of file