You described your idea to an AI, it wrote the code, and the app works. Except it only works on your computer, at an address nobody else can open: localhost:3000. As long as you stay there, you can't show your work, you can't sell it, and you can't even test it from your phone.
Deployment is the step that turns that folder sitting on your hard drive into a site anyone can reach from any browser. With Vercel, that step takes about twenty minutes the first time, and under two minutes every time after. No server to rent, no network configuration, no credit card for a personal project.
Here you'll see the bare-minimum prep work (5 minutes), the three ways to deploy depending on your comfort level, a minute-by-minute walkthrough, how to handle your API keys without exposing them to the whole world, and the five errors that derail most first deployments.
What Is Vercel, and Why Does Everyone Use It for Vibe Coding?
Vercel is a host that puts your application online straight from your code, without you configuring a single server. You hand it your project, it installs it, builds it, then gives it a secure public address like my-app.vercel.app.
Vibe coding means describing in plain English what you want and letting an assistant like Claude Code write the code for you. In the vast majority of cases, these assistants produce a Next.js or React project. And Next.js is built by Vercel — same company. Compatibility is total, which is why nearly every vibe coding project lands there rather than somewhere else.
What Vercel takes off your plate:
- renting and administering a server
- installing Node.js and dependencies on that server
- the HTTPS certificate (the padlock in the address bar), generated automatically
- manual redeployment: a simple code push is enough to update the site
- scaling up when 500 people show up at once
The Hobby plan is free for personal, non-commercial projects, with a free .vercel.app subdomain included. The exact quotas and the line between personal and commercial use are spelled out in the official Vercel documentation. The moment your app generates revenue, you have to move to a paid plan: that's the rule, and it's better to know it before you launch a store.
What You Need Before Clicking Deploy (5 Minutes)
Three things are enough: a GitHub account, a Vercel account, and a project that starts without errors on your computer.
- A free GitHub account. GitHub is where your code will live online. It's also what lets Vercel detect your changes and republish your app on its own.
- A Vercel account. You create it by signing in with your GitHub account, in thirty seconds, no credit card for the free plan.
- A project that runs locally. If the command npm run dev opens your app in the browser, your foundation is solid.
Then, two checks that prevent the vast majority of failures.
Check 1: the .gitignore file. This file lists what should never go up to GitHub. At minimum it needs to contain the lines .env, .env.local and node_modules. If your AI assistant didn't create it, ask it to do so before pushing any code.
Check 2: the npm run build command passes without errors. That's exactly the command Vercel will run on its machines. If it fails on your machine, it will fail on theirs. If it shows errors, copy the full message, paste it to your assistant and ask it to fix the issue, then run it again. Two or three rounds usually do it.
If you're still new to the tool, the complete Claude Code tutorial for beginners and the 20 Claude Code commands worth knowing will save you a lot of time during this cleanup phase.
The Three Ways to Deploy Your App on Vercel
Three paths lead to the same result: a guided course, importing from GitHub, or the command line. They all give you a public URL; what really separates them is what you do when something gets stuck.
Method 1: Get Guided From Start to Finish
The hard part of a first deployment is almost never technical. It's that you don't know what you don't know: which folder to push, why the build breaks, where to put a key, what a branch is for. A structured course fills those gaps.
The Claude Code program for building and publishing your app walks the whole path, from the initial idea to the live app, with real error cases shown on screen rather than a perfect project that works on the first try. The built-in AI Lab gives you access to the real tools with credits included, which saves you from stacking three or four subscriptions before you've published anything at all.
Worth noting if you want to fund your upskilling: Skilzy offers two state-registered certifications, including the RS7439 certification in AI-assisted content marketing, listed in the France Compétences directory.
Method 2: Import From GitHub
This is the most-used route, and it's free. You push your code to a GitHub repository, click Add New Project in Vercel, select the repo, and confirm. Vercel recognizes the project type on its own and fills in the settings. Big upside: every time you push a change, your site updates by itself in one to two minutes.
Method 3: The Vercel Command Line
If your terminal is already open, install the tool with npm install -g vercel, sign in with vercel login, run vercel inside the project folder for a preview version, then vercel --prod for the final public version. It's the fastest method once you're used to it, but you lose automatic updates if you don't connect GitHub behind it.
| Method | Time the first go | Requirements | Who it's for |
|---|---|---|---|
| 1. Guided course | 20 min, no roadblocks | A Skilzy account | Complete beginners who want to finish |
| 2. GitHub import | 20 to 30 min | GitHub account | Everyone — it's the standard |
| 3. Command line | 10 min | Terminal, Node.js installed | People already comfortable with it |
The Deployment, Minute by Minute
Budget about twenty minutes across six steps, half of which is spent waiting for machines to do their work.
Minutes 0 to 6: push the code to GitHub. Create an empty repository on GitHub, private if you prefer (Vercel can still access it). Then ask your assistant to prepare the push: it will run the commands to initialize, add the files, make the first commit, and link to the repo. Afterward, check on GitHub that the .env file appears nowhere in the list. If it's there, stop everything and fix it before continuing.
Minutes 6 to 9: create the project in Vercel. Sign in with GitHub, click Add New then Project, authorize access to the repo, select it.
Minutes 9 to 12: check the settings. Vercel shows a Framework Preset (Next.js, Vite, Astro depending on your project), a Root Directory and a Build Command. In 9 cases out of 10, you change nothing. The one setting to watch is the Root Directory: if your code sits in a subfolder like app or frontend, specify it here, otherwise the build will find nothing.
Minutes 12 to 16: add the environment variables. Open the Environment Variables section and copy over each line of your local .env file: the name on the left, the value on the right. This is the most frequently forgotten step, and the one that causes the most blank pages after deployment.
Minutes 16 to 18: run the build. Click Deploy. The log scrolls live. You'll see dependencies installing, the build running, then the result. A failure at this stage is normal and readable: the exact error message is displayed in red in the log.
Minutes 18 to 20: test it for real. Open the URL you're given, then reopen it from your phone on cellular data, off your home network. Click every button, submit a form, test an action that calls an AI. That's where missing variables reveal themselves.
Your API Keys Must Never Go Up to GitHub
An API key published in a public repository can be found and used by anyone within minutes, and you're the one who gets the bill. Bots scan GitHub constantly looking for those strings.
The three rules to remember:
- Keys live in the .env.local file on your computer, and that file is listed in .gitignore. So it never goes online.
- On Vercel, keys go into Environment Variables, never into the code. You can set different values for production and for preview versions.
- The NEXT_PUBLIC_ prefix changes everything. A variable named NEXT_PUBLIC_SOMETHING is sent to the visitor's browser, so it's visible to everyone. An API key must never carry that prefix. Save it for things that are genuinely public, like a site URL.
If a key has already been pushed to GitHub, deleting the file isn't enough: the history keeps it. You have to revoke the key with the provider and generate a new one. It takes ten seconds and saves you a very unpleasant surprise.
One last point that's often misunderstood: calls to an AI must go out from the server, not from the browser. In practice, your app calls an internal route, and that route is what contacts the API with the key. The principle is laid out in our article on building a company chatbot with Claude, where the same logic applies.
The Five Errors That Sink a First Deployment
Nearly every failure traces back to five causes, all of them readable in the build log.
1. It works locally but not on Vercel. Vercel's servers run Linux, which is case-sensitive in file names. An import of Button when the file is actually named button passes on Mac and Windows, and breaks on Vercel. Fix the casing and the problem disappears.
2. Blank page or 500 error after a successful build. Almost always a missing environment variable. Go back into Settings, add it, then trigger a new deployment: variables are not applied retroactively.
3. The build can't find any files. Root Directory set incorrectly. Point it at the subfolder that contains package.json.
4. Module not found even though the package is installed on your machine. The package-lock.json file wasn't pushed, or the dependency was filed under devDependencies when the build needs it. Reinstall cleanly and push the code again.
5. The database doesn't respond. If your assistant created a SQLite database as a local file, it doesn't exist on Vercel. You need a database hosted online. Ask your assistant to migrate to a remote database before deploying rather than after.
In all five cases, the method is the same: copy the full error log, paste it to your assistant with the line “here's the Vercel build error, fix the project”, and redeploy. If you want to understand the shape of a deployed Next.js project, the Next.js documentation is still the reference.
What You Do Once the App Is Live
You have a public URL, over HTTPS, that you can send to anyone. From there, two useful moves: hook up a custom domain name in the Domains tab if you own one, and get in the habit of pushing your changes to GitHub, since every push republishes the site automatically.
The first deployment is the only one that takes twenty minutes. The next one will take two, and you'll finally spend your time on what matters: what your app actually does for the people using it.
