How I successfully uploaded a file using Vue and Sails ⛵️

Kelvin Omereshone
Vue.js Developers
Published in
3 min readMay 7, 2019
Photo by Ben White on Unsplash

Ever had one of those moments when you feel like doing the chicken dance and saying “yes! yes!!!” until people around feel you are losing your marshmallows? Well, I had one of those a few minutes after I painstakingly figured out how to successfully upload images using VueJS to my Sails Web service.

Indeed I wish I had found the solutions from the Sails community but no one was answering me so I figured it out(isn’t that what we do mostly as developers). Let me show you how I did it!

Prelude — Sails Action

So I have a Sails web service and upload actions(look out for my article where I explain why I use actions instead of controllers)

So my upload.js action contains the code below:

upload.js(my Sails action responsible for handling the upload of my avatar)

The Vue Side of Things

Now to the meat. I found out that Sails was not really the problem but the issue was with my browser and my Vue code. Let me show you:

My template P.S: I am using SFC:

My form for the upload(template)
The upload method

Looks pretty easy right? But let me explain how I got to this — First, using fetch I normally specify the content type of my POST request but I discovered doing that when using the type of multipart/form-data, Sails didn’t seem to get access to the payload, Why? I think it has something to do with boundary(a mechanism which the server would use to get an individual piece of your request payload. So what did I do? I allowed the browser to handle that by not specifying it in the request options. And that was the Silver bullet!


It was a learnable moment and what really helped me was Advance Rest Client(ARC) I stumbled upon it in my search for answers and after using it to hit my upload endpoint I had the idea to remove the content type and bam! I got it!

I hope this helps you and do look out for more Sails and Vue recipe from me. Also, leave a comment if you have a question. 😃

Learn about FormData here

Happy deploying 🚀 🚀 🚀



Kelvin Omereshone
Vue.js Developers

Currently building Sailscasts — a platform to learn server-side JavaScript with the Sails.js framework. Come learn and master Sails.js @