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Vercel - Frontend Deploy & Hosting | Klero Resources

A practical guide to Vercel: deploy Next.js, React, and static sites with speed and previews. Learn what actually saves time and when it fits.

Vercel

Vercel is a platform for frontend deployment. Connect a Git repo, and every push gets a unique preview URL; the production branch deploys to your main domain. Next.js, React, and static sites are first-class. This guide covers what matters for product and engineering: workflows, previews, and when Vercel is the right default.

Deploying Next.js to Vercel

Why vercel fits product work

  • Git-native - Push to a branch; get a preview. Push to main (or your production branch); get production. No manual uploads or “which build is live?” confusion.
  • Preview URLs per PR - Every pull request gets a unique URL. Share it for design review, QA, or stakeholder sign-off before merging.
  • Next.js and React - Optimized for the Next.js and React ecosystem. Framework detection, env handling, and serverless functions work out of the box.
  • Edge and serverless - Run code at the edge or as serverless functions. Good for APIs, auth callbacks, and light backends without managing servers.
  • Speed and CDN - Globally distributed CDN and fast cold starts. Good fit for marketing sites, dashboards, and product frontends.

    • Core concepts that matter

    Projects and git connection

    A project is one deployment pipeline. Connect a Git repository (GitHub, GitLab, or Bitbucket); Vercel imports the repo and suggests a framework. One project usually maps to one repo (or one app in a monorepo). Choose the production branch (often main); that branch deploys to the primary domain.

    Build and output

    Vercel runs a build for each deploy. It detects the framework (Next.js, Create React App, etc.) and runs the right build command. Output can be static files, serverless functions, or a mix. For Next.js, it handles pages, API routes, and middleware automatically. Override build command or output in Project Settings if you need to.

    Previews and production

    Preview - Every non-production branch (and every PR) gets a unique URL, e.g. your-app-abc123.vercel.app. Use it for QA and demos. Production - The production branch deploys to your main domain (e.g. yourapp.com). Only one production deploy per branch push; redeploys are triggered by new commits or manual “Redeploy.”

    Next.js 15 - Deploying Next.js Apps to Vercel

    Environment variables and secrets

    Set environment variables in the dashboard (or via CLI): per project, and optionally scoped to Production, Preview, or Development. Use them for API keys, feature flags, and backend URLs. For sensitive values, use Vercel’s env UI (or a secret manager) and reference them in the build/runtime.

    Serverless and edge

    Serverless functions live in /api (or equivalent) and run on request. Edge runs at the edge for low latency. Use them for auth callbacks, webhooks, and small APIs. For heavy or long-running backends, keep that logic on your own infrastructure and call it from Vercel.

    Practical habits

  • One project per app - One Vercel project per frontend app (or per deploy target). Keeps envs and domains clear.
  • Use preview URLs in PRs - Add the Vercel bot comment or link the preview in the PR description. Reviewers click once to see the change.
  • Protect production - Use branch protection and required status checks so only reviewed, passing code deploys to production.
  • Set envs once - Configure env vars in the project; use the same keys in Preview and Production with different values if needed.
  • Monitor build and runtime - Use Vercel’s logs and analytics (or your own) to catch build failures and runtime errors early.

    • When vercel isn’t the fit

  • Heavy backend or long jobs - Vercel is built for frontend and light serverless. Use a proper backend (e.g. Railway, Fly, or your own) for databases, queues, or long-running work.
  • Strict data residency - If you need all compute and data in one region, check Vercel’s regions and compliance; you may need another host.
  • Non-JS or custom runtimes - Best experience is Next.js/React/Node. Other stacks can work with custom build commands but are secondary.

    • Pricing (high level)

    Hobby - Free for personal use: unlimited static sites, serverless, and previews. Good for side projects and demos.

    Pro - Team features, more bandwidth, password-protected previews, and analytics. Enterprise - SSO, SLA, and compliance. See Vercel’s pricing for current details.

    For frontend teams shipping Next.js or React, Vercel is a strong default: connect the repo, get previews and production, and focus on product. Add serverless or edge only when you need them.

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