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Features

Everything underneath your product, already built.

Eighteen subsystems, most of them switched from one file, starter.config.ts. Turn one off and its code leaves the deploy.

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A board of the eighteen subsystems, grouped like this page, lights up one part at a time while a counter climbs to 18. Then the config line for AI is set to false: AI goes dark, the counter drops to 17, and a note says its code leaves the deploy.

Subsystems so far

0of 18

Extend it by
key A config key you set
file A file you add
call A call you make

01Accounts

Every account knows what it may do.

Who signs in, which organization they act for, and what they may do.

  • Auth

    Docs

    Passwords, magic links, passkeys, OAuth and two-factor codes.

    Extend it bykeyauth.oauth

  • Organizations

    Docs

    Organizations with roles, seats and invitations, and a second level such as branches when you need one.

    Extend it bykeyorgs.roles.<role>

  • Roles and permissions

    Docs

    Capabilities granted by role and by plan, enforced on the server.

    Extend it bykeyaccess.permissions

A grid of roles and permissions fills in: staff can read users and author the blog, and superadmin can also manage users. Maya, a plain user, asks for insights and is refused with 402 upgrade-required. Her organization buys Pro, the plan grants insights:read, and the same check answers 200.

02Payments

A declined card is not a lost customer.

Four providers behind one plan catalogue, from checkout to refund.

  • Payments

    Docs

    Stripe, Polar, Lemon Squeezy or Creem, with trials, coupons, refunds and a grace period.

    Extend it bykeypayments.plans.<plan>

A Pro subscription moves along its timeline: a trial starts on October 1, the first charge of $4.99 goes through on October 15, and the renewal on November 15 is declined. The subscription goes past due, and a banner says access stays on until November 29 and links to the billing portal. The provider retries on November 18, the charge is paid and the subscription is active again, without access ever stopping.

03Platform

Migrations run. Failed jobs retry.

Tables, work that runs later, files and messages.

  • Database

    Docs

    Drizzle on Postgres through Hyperdrive, with your tables on a migration chain of their own.

    Extend it byfileserver/database/custom/schema.ts

  • Background jobs

    Docs

    Cloudflare Queues with retries and a dead letter queue.

    Extend it byfileserver/jobs/<kind>.ts

  • Events

    Docs

    Typed events your code reacts to without editing the code that fires them.

    Extend it byfileserver/listeners/<name>.ts

  • Storage

    Docs

    R2 uploads by purpose, checked by their real file type.

    Extend it bykeystorage.purposes.<purpose>

  • Email

    Docs

    Transactional mail with provider fallback, categories and unsubscribe.

    Extend it bykeyemail.providers

  • Notifications

    Docs

    An in-app bell, with categories a user can turn off.

    Extend it bycallnotify(event, { type, … })

pnpm db:migrate applies the template's five migrations, then your own chain. Below, three jobs run on the queue: email succeeds at once, billing-email fails, waits a minute and succeeds on attempt 2, and crm-sync fails all six attempts and lands in the dead letter queue, where it is reported.

04Product

Flag it, translate it, measure it.

What your users see, and what you learn from them.

  • AI

    Docs

    Text, image, speech, transcription, embedding and video over one binding.

    Extend it bykeyai.roles.<role>

  • Feature flags

    Docs

    Declared flags, evaluated during SSR and stored in KV or R2.

    Extend it bykeyflags.declarations.<flag>

  • Analytics

    Docs

    Server-side events to Cloudflare, Umami or PostHog, with no pixel to block.

    Extend it bykeyanalytics.providers

  • Languages

    Docs

    Full i18n, with tests that fail on a missing key.

    Extend it byfilei18n/locales/<code>.json

  • Blog

    Docs

    Nuxt Content posts, and a CI job that drafts new ones as pull requests.

    Extend it byfilecontent/<locale>/blog/<slug>.md

A pricing page in a browser. The newPricing flag is switched on and the page renders again with a New badge. The language switch goes from EN to SR and the card re-renders in Serbian, with the price as 4,99 US$. A visitor asks in Serbian whether they can cancel, and the AI answers in Serbian. Each page view appears in the analytics stream: /pricing twice, then /sr/pricing.

05Edge and ops

Every request is guarded and traced.

Headers and limits in front of every request, and errors forwarded when one fails.

  • Security headers

    Docs

    A Content Security Policy and hardening headers on every response.

    Extend it bykeysecurity.cspExtend

  • Rate limiting

    Docs

    A cap per route and caller, counted in a Durable Object, with floods shed at the edge first.

    Extend it bycallrequireRateLimit(event, …)

  • Observability

    Docs

    Request ids, a health endpoint, and errors forwarded to Sentry or Better Stack without an SDK.

    Extend it bykeymonitoring.providers

A GET request to /api/report gets the request id 8f2a61c4bd9e3a10-FRA, passes the rate limit at 12 of 60 this minute, and fails with a 500. The response still carries its six security headers, and the error reaches Sentry tagged with the same request id.

Docs

Every part has a page in the docs.

How it works, how to set it up and where your own code goes. The docs are public, so you can read any page before you buy.

AGENTS.md Briefs AI coding agents on the conventions, the seams and the traps.

Read the docsHow updates work