<\/a><\/p>\nWhat Are The Steps To Upload Large Files as Chunks Using React JS?<\/b><\/h2>\n
Here are the steps to upload large files as chunks using ReactJS:<\/span><\/p>\nSet up a Reactjs Project.<\/b><\/h3>\n
Before we dive into the chunk upload functionality, we need to set up a ReactJS project. If you already have a project set up, feel free to skip this section.<\/span><\/p>\nInstall Node.js and npm: Node.js and npm are essential for setting up a ReactJS project. We can download them from the official website (https:\/\/nodejs.org\/en\/).<\/span><\/p>\nCreate a new project: To create a new project, we can use the following command in our terminal:<\/span><\/p>\n\n\n\nnpx create-react-app my-app<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Navigate to the project directory: After creating a new project, navigate to the project directory using the following command:<\/span><\/p>\n\n\n\ncd my-app<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Start the development server: Start the development server using the following command:<\/span><\/p>\n\n\n\nnpm start<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Now that we have set up a ReactJS project, let’s dive into the chunk upload functionality.<\/span><\/p>\nBreak the Large File Into Smaller Chunks.<\/b><\/h3>\nRead the file using the File API in JavaScript. We have to use the <\/span>FileReader<\/b> object to read the file and access its data.<\/span><\/p>\nThe next step is to determine the chunk size. Decide on the desired chunk size, typically in the range of a few kilobytes to several megabytes.<\/span><\/p>\nThen, we must split the file into chunks. In this case, we have to use the <\/span>slice<\/b> method of the <\/span>Blob<\/b> object to split the file into chunks of the desired size.<\/span><\/p>\n\n\n\nlet<\/b> chunkSize = <\/span>5<\/span> * <\/span>1024<\/span> * <\/span>1024<\/span>; <\/span>\/\/ 5 MB chunk size<\/span><\/i> \n<\/span>let<\/b> chunks = [];<\/span> \n<\/span>let<\/b> fileSize = file.size;<\/span> \n<\/span>let<\/b> start = <\/span>0<\/span>;<\/span> \n<\/span>let<\/b> end = chunkSize;<\/span> \n<\/span> \n<\/span>while<\/b> (start < fileSize) {<\/span> \n<\/span>\u00a0 chunks.push(file.slice(start, end));<\/span> \n<\/span>\u00a0 start = end;<\/span> \n<\/span>\u00a0 end = start + chunkSize;<\/span> \n<\/span>}<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nSend Each Chunk to the Server Using Axios or a Similar Library<\/b><\/h3>\nThen, we have to upload each chunk. For this purpose, we must iterate through the chunks array and send each chunk to the server using Axios. We can also use a similar library for making HTTP requests. This is a basic implementation of breaking a large file into smaller chunks in JavaScript. We can further customize the implementation based on our specific use case and requirements.<\/span><\/p>\nAxios makes sending HTTP requests easy and handles the response data in a ReactJS project.<\/span><\/p>\n\n\n\nimport<\/b> axios <\/span>from<\/b> ‘axios’<\/span>;<\/span> \n<\/span> \n<\/span>let<\/b> uploadPromises = [];<\/span> \n<\/span> \n<\/span>chunks.forEach((chunk, index) => {<\/span> \n<\/span>\u00a0 <\/span>let<\/b> formData = <\/span>new<\/b> FormData();<\/span> \n<\/span>\u00a0 formData.append(<\/span>‘chunk’<\/span>, chunk, <\/span>`chunk-<\/span>${index}<\/span>`<\/span>);<\/span> \n<\/span> \n<\/span>\u00a0 <\/span>let<\/b> uploadPromise = axios.post(<\/span>‘\/upload’<\/span>, formData);<\/span> \n<\/span>\u00a0 uploadPromises.push(uploadPromise);<\/span> \n<\/span>});<\/span> \n<\/span> \n<\/span>Promise<\/span>.all(uploadPromises)<\/span> \n<\/span>\u00a0 .then(responses => {<\/span> \n<\/span>\u00a0 \u00a0 <\/span>console<\/span>.log(<\/span>‘All chunks uploaded successfully!’<\/span>);<\/span> \n<\/span>\u00a0 })<\/span> \n<\/span>\u00a0 .catch(error => {<\/span> \n<\/span>\u00a0 \u00a0 <\/span>console<\/span>.error(<\/span>‘Error uploading chunks:’<\/span>, error);<\/span> \n<\/span>\u00a0 });<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nOn the Server Side, Receive and Store Each Chunk.<\/b><\/h3>\nIn the server-side code, you can create an endpoint using Node.js and Express to temporarily receive and store the chunks. A middleware library such as Multer can be used to handle the file upload and access the uploaded file data.<\/span><\/p>\n\n\n\nconst<\/b> express = <\/span>require<\/span>(<\/span>‘express’<\/span>);<\/span> \n<\/span>const<\/b> multer = <\/span>require<\/span>(<\/span>‘multer’<\/span>);<\/span> \n<\/span>const<\/b> app = express();<\/span> \n<\/span>const<\/b> port = process.env.PORT || <\/span>5000<\/span>;<\/span> \n<\/span> \n<\/span>const<\/b> upload = multer();<\/span> \n<\/span> \n<\/span>app.post(<\/span>‘\/upload’<\/span>, upload.single(<\/span>‘chunk’<\/span>), (req, res) => {<\/span> \n<\/span>\u00a0 <\/span>let<\/b> chunk = req.file;<\/span> \n<\/span> \n<\/span>\u00a0 <\/span>\/\/ Store the chunk temporarily<\/span><\/i> \n<\/span>});<\/span> \n<\/span> \n<\/span>app.listen(port, () => {<\/span> \n<\/span>\u00a0 <\/span>console<\/span>.log(<\/span>`Server is listening on port <\/span>${port}<\/span>`<\/span>);<\/span> \n<\/span>});<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nAfter All, the Chunks Have Been Uploaded, Combine Them to Form the Complete File<\/b><\/h3>\nThis can be done by creating a new Blob object and concatenating all the chunks using the <\/span>Blob.concat<\/b> method. Once the complete file has been formed, it can be saved to a permanent storage location such as a database or a file system.<\/span><\/p>\n\n\n\nlet<\/b> chunks = [];<\/span> \n<\/span> \n<\/span>app.post(<\/span>‘\/upload’<\/span>, upload.single(<\/span>‘chunk’<\/span>), (req, res) => {<\/span> \n<\/span>\u00a0 <\/span>let<\/b> chunk = req.file;<\/span> \n<\/span> | | | | | | |