microfrontends
Guide for building, configuring, and deploying microfrontends on Vercel. Use this skill when the user mentions microfrontends, multi-zones, splitting an app across teams, independent deployments, cross-app routing, incremental migration, composing multiple frontends under one domain, microfrontends.json, @vercel/microfrontends, the microfrontends local proxy, or path-based routing between Vercel projects. Also use when the user asks about shared layouts across projects, navigation between microfrontends, fallback environments, asset prefixes, or feature flag controlled routing.
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Vercel Microfrontends
Split a large application into independently deployable units that render as one cohesive app. Vercel handles routing on its global network using microfrontends.json.
Core concepts: default app (has microfrontends.json, serves unmatched requests) · child apps (have routing path patterns) · asset prefix (prevents static-asset collisions) · independent deployments.
Frameworks: Next.js (App Router + Pages Router), SvelteKit, React Router, Vite — all via @vercel/microfrontends.
CLI (vercel microfrontends / vercel mf):
create-group— create a new group; interactive by default, or fully non-interactive with--non-interactive(options:--name,--project(repeatable),--default-app,--default-route,--project-default-route(repeatable, format:<project>=<route>, required for each non-default project in non-interactive mode),--yesto skip confirmation prompt); note:--non-interactiveis blocked if adding the projects would exceed the free tier limit — the user must confirm billing changes interactivelyadd-to-group— add the current project to an existing group; always asks for confirmation (there is no--yes), so it needs an interactive terminal, and it refuses to run with--non-interactivewhen adding would go past the free project limit (options:--groupand--default-routepre-fill the prompts)remove-from-group— remove the current project from its group; requires interactive terminal (option:--yesskips project-link prompt only)delete-group— delete a group and all its settings, irreversible; requires interactive terminal (option:--groupto pre-select group)inspect-group— retrieve group metadata (project names, frameworks, git repos, root dirs); useful for automating setup (options:--group,--format=json,--config-file-name)pull— pull remotemicrofrontends.jsonfor local development (option:--dpl)microfrontends proxy— local dev proxy ·microfrontends port— print auto-assigned port
Finding Detailed Information
This skill includes detailed reference docs in the references/ directory. Do not read all references upfront. Instead, search or grep the relevant file when the user asks about a specific topic:
| Topic | Reference file |
|---|---|
Getting started, quickstart, framework setup, microfrontends.json schema, fields, naming, examples | references/configuration.md |
| Path expressions, asset prefixes, flag-controlled routing, middleware | references/path-routing.md |
| Local proxy setup, polyrepo config, Turborepo, ports, deployment protection | references/local-development.md |
Inspecting groups (inspect-group), adding/removing projects, fallback environments, navigation, observability | references/managing-microfrontends.md |
Testing utilities (validateMiddlewareConfig, validateRouting, etc.), debug headers, common issues | references/troubleshooting.md |
| Deployment protection, Vercel Firewall, WAF rules for microfrontends | references/security.md |
When the user asks about a specific topic, use grep or search over the relevant reference file to find the answer without loading all references into context.
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- vercel/vercel-plugin
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