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Build a Bun.js File Upload to Server Using HTML Form in Browser Using TypeScript Web App
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Jun 7, 2025
Get the full source code of the application here: Official Website: https://freemediatools.com
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0:02
uh hello guys welcome to this live
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stream so in this live stream I'll show
0:06
you a new uh framework in uh the
0:10
programming world which is bunjs uh
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which is a alternative to NodeJS it's a
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runtime environment and I will show you
0:17
a complete file upload project in this
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framework so if you just type here on
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Google which is bunjs you will actually
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see this
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framework let me just
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close just type here bunjs this is the
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JavaScript runtime environment similar
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to NodeJS this is their official
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website and uh you can install this on
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Windows either by opening
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PowerShell so they have given this
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command or you can simply install it by
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npm as well so go to the terminal and
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just install it globally just type this
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command
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npmi-g and write bun so this is actually
1:04
the command this will install bun
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globally inside your terminal and uh it
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basically works in Typescript so we have
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basically built this application which
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runs in port number 3000 which actually
1:17
uploads your files in the server using
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an HTML form so this is actually the
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directory structure we have the uploads
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directory which is currently empty so
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here all the uploaded files will get
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stored so our application is running on
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localhost 3000 so if I try to open
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this so first of all you just need to
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run this project so for running this
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project it will
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be simply the command
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here so you just write bun run and after
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that the file name so I call this as
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server.ts just run this and now your
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application will start at localhost 3000
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this is a simple form here where the
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user can upload files and we basically
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choose the file here and here you just
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need to
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go and select a file here you can see we
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have selected a file and then click
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upload as soon as you upload the file
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you'll get this message that your file
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is uploaded and it has given a random
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name and if you check your uploads
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directory you will see the file is
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successfully uploaded and we can repeat
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this process here and let's suppose if I
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select a different file
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here you will see the same process will
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repeat and a new file is automatically
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inserted so now to get started here so I
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will delete everything so first of all
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just create a simple file server.ts file
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in the root directory
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and now just in basically write this
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code so we need to import the necessary
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packages so first of all we need to
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import the serve method which will be
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coming from this package and then we
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also need to import make directory
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sync and write
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file sync this will also be coming from
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the base package which will file system
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and then we also need to import the join
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which will be coming from path so these
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two fun uh modules are built-in modules
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and this is actually the bun module that
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we installed early on and now first of
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all we need to create a directory
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automatically if the directory doesn't
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exist we need to use this function make
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directory sync to create this uploads
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directory where all the uploaded files
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will be stored and then recursive option
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we can pass true
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so then we can start this application by
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calling this serve method and here it
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takes the port number on which you need
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to actually serve your applications so I
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will simply write the port number to be
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3,00 and then we actually write a
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function which will be responsible for
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all the request which will be coming
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from the buns server so inside this
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function you will write all the request
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so first of all we will catch the
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URL like this new URL and then the
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request URL so whatever is the URL
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coming here we'll compare right here if
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the URL path name is equal to the home
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request if it's a home request then we
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need to show a simple form to the user
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so in this way we can show a form here
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we can return the response like this and
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then bun dot so we imported this package
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which is bun so
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bul and it contains this
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uh file and here you can pass the file
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which is stored in the public directory
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index html so now you just need to
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create a public directory and inside
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that public directory your index html
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file which will be a simple
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form
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so this will be a
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simple form so here it contains a form
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tag input type
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file and give it a name attribute here
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file after that we will have a button
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here of upload so when the user clicks
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the upload button the file will be
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uploaded so button type will be submit
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and here you just need to attach three
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attributes here the action attribute
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which will redirect the user when you
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click the upload button it will make a
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post request to this route here
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/upload the method will be a post here
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and encoding type will be multiart form
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data so these are the three attributes
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here that we pass here and after that
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here you just need to if you refresh
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your application just run this
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application on the
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terminal with this command bun run
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server.ts TS and if you check in the
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browser just open localhost 3000 you
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will see the form will show this is your
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HTML form which is showing right here
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you have the choose file button and if
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you select a file image file and click
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the upload button you will see this
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error will be there because you haven't
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uh created this uh post post request so
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we are submitting we are making a post
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request to this route so now we just
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need to make this post request in this
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route in the buns server side code so
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right here we just need to handle the
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file upload so we will compare this if
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the URL is equal to
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/upload and also we will check right
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here if the method
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is
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post if all these two conditions are
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true then we will upload the files so in
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this way you can check in buns and now
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for file upload it's very easy we will
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make a new object of form data so you
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will say request dot form
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data and then we will get access to the
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file form
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data.get and here you just need to pass
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the name attribute that you passed in
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the HTML file so whatever is the name
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attribute that you have given right here
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this needs to be the same right here so
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these two things need to be same after
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you get access to the file you can
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easily upload this so file instance of
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file and here we first of all convert
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this file to array buffer for converting
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this file to array buffer we simply call
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the function array buffer we convert
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this to array buffer and then from array
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buffer we will convert this into a
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buffer so we can use the buffer class
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and it contains this function from and
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here we can pass this array buffer and
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then we can upload this to the actual
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path by using the join function so here
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we need to upload this file to the
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uploads directory and whatever is the
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file name after that we call this
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function write file sync we upload this
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to the file path whatever is the buffer
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and then we return the response back to
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the client that your file is uploaded so
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we simply say that file uploaded and
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then we simply print the name of the
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file as well so that's all that we need
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to do and uh after that you can check
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your
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browser just if you make the changes
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just restart the application and as soon
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as you do this just go to localhost 3000
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try to upload a
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file select the file click upload and
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you will get this message that your file
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is uploaded and it has if you check the
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uploads folder you will see the file is
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successfully
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there and if you repeat this
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process select a different file here
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click upload you will see again the file
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will get uploaded so this is a very
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basic project of file upload how to do
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in buns i showed you from scratch so
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bunjs is very much a NodeJS alternative
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and uh if you ever want to try other
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frameworks bunches is one of them so
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it's quite easy you can see it works
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with Typescript not JavaScript you
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create the server file and the nice
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thing about Bunge is that you need not
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have to install much third party
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packages as compared to NodeJS it works
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with uh less packages it is very
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lightweight as compared to NodeJS and
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you can decide and also check out my
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website which is freemediatools.com
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uh which contains unlimited tools
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regarding audio video and image and I
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will be seeing you in the next
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