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How to Fix “Bolt.diy Error Occurred at / Port 5173”

Ethan Martinez

Ever run into an error like “Bolt.diy Error Occurred at / Port 5173” and felt like throwing your laptop out the window? Don't worry – you're not alone. This little gremlin can pop up when you're working on a web project, especially one that uses a development server like Vite. But the good news? It's fixable, and we're going to make it fun!

TL;DR

If you're seeing a Bolt.diy error on Port 5173, it's likely a config or dependency issue in your project. Try restarting the dev server, checking your vite.config.js, or ensuring no other service is using the port. Sometimes deleting node_modules and reinstalling packages helps too. We’ll walk you through all of it!

🤔 What’s This Error, Anyway?

Let’s break it down.

This combo typically screams: “Hey, your frontend can't boot properly!”

But why does it happen? Usually one of these reasons:

  1. The dev server crashed during boot.
  2. A dependency isn’t compatible.
  3. Your config file has a mistake.
  4. Something else is using Port 5173.

🛠️ How to Fix It Step by Step

1. Stop the Server and Restart It

The classic move! If your terminal is showing errors, kill the current process.

CTRL + C

Then fire it back up:

npm run dev

Or if you’re using Yarn:

yarn dev

2. Make Sure Port 5173 Isn't Taken

Sometimes another app is using the same port. That leads to chaos.

Check for active processes on the port:

lsof -i :5173

Then kill the conflicting process:

kill -9 [PID]

3. Check Your vite.config.js

This file controls how Vite runs. A wrong config here can trip everything.

Look for common issues like:

Example of a correct basic config:


import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'

export default defineConfig({
  plugins: [vue()],
  server: {
    port: 5173
  }
})

4. Reinstall All Dependencies

Sometimes something just breaks in node_modules. We’ve all been there.

Try this:


rm -rf node_modules
rm package-lock.json  # or yarn.lock if you're using Yarn
npm install

Then run your project again.

5. Look Through Browser Console & Terminal Logs

Often, helpful clues hide in your terminal or browser console.

Check both closely for:

It might point to the exact line where something broke.

6. Try a Different Port (as a Test)

This doesn’t solve the root issue but tells us if Port 5173 is the problem.

Change your dev server port in vite.config.js:


server: {
  port: 3000
}

Then restart Vite. If it works, your original port was just too crowded.

7. Check for Bolt.diy Specific Issues

If Bolt.diy is part of your app, it could be outdated or misconfigured.

Try:

🧠 Bonus Tip: Use Logs Like a Detective

If you’ve tried all the basic steps and the error keeps haunting you, dig deeper.

Try adding some logs to your server code or plugins:

console.log("Plugin loaded correctly!")

The goal is to trace where things are being blocked or failing silently.

🧼 Final Deep Clean

If all else fails, you can nuke the project universe and rebuild it.

Try these steps:

  1. Backup your code
  2. Delete the project folder
  3. Clone it fresh from your git repo
  4. Reinstall everything fresh

This hurts, but sometimes it's the cleanest path forward.

🚧 Common Mistakes to Avoid

Remember: clean code = happy code.

📦 What If It’s a Bug in Vite?

Rare, but possible. Sometimes Vite updates introduce bugs.

Check the following:


npm install vite@latest-good-version

Read changelogs before upgrading.

🎉 You Fixed It — Now What?

If things are working again, give yourself a pat on the back.

Better yet, make a checklist for future debugging:

✨ Wrap-Up

The “Bolt.diy error occurred at / port 5173” can be annoying. But it's not a monster you can't defeat. With a systematic approach and a little patience, you’ll fix it faster than you can say “npm install.”

Stay calm, debug smart, and drink some water. You've got this 🔧🚀

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