A lightweight backend,
in one YAML file.

Define your schema in one YAML file and get a full Postgres-backed API with auth, RLS, functions, and storage. Self-host it as a single binary, point your existing supabase-js code at it, and you are running in minutes.

Quick Start S View on GitHub G

Install

$curl -fsSL https://get.instancez.ai | sh

PS>irm https://get.instancez.ai/windows | iex

How it looks

Write YAML. Ship a backend system.

One file holds your schema and its RLS policies. instancez handles the migration and serves the API.

instancez.yaml

tables:
  posts:
    fields:
      - name: id
        type: bigserial
        primary_key: true
      - name: title
        type: text
        required: true
      - name: user_id
        type: uuid
        foreign_key:
          references: auth.users.id
    rls:
      - operations: [select]
        using: "true"
      - operations: [insert]
        with_check: "auth.uid() = user_id"
      - operations: [update]
        using: "auth.uid() = user_id"
        with_check: "auth.uid() = user_id"
      - operations: [delete]
        using: "auth.uid() = user_id"

app.ts

// @supabase/supabase-js, unchanged
const supabase = createClient(
  'http://localhost:8080',
  'your-anon-key'
)

// query
const  data  = await supabase
  .from('posts')
  .select('id, title')
  .order('id',  ascending: false )

// insert: RLS checks user_id for you
const  data  = await supabase
  .from('posts')
  .insert( title: 'Hello world' )
  .select()
  .single()

What you get

Everything you need. Nothing extra.

Wire-compatible with @supabase/supabase-js. Drop it in. Your client code stays the same.

SCHEMA

YAML-driven schema

Declare tables, fields, types, and RLS policies in instancez.yaml. In dev mode, saving the file applies migrations for you.

AUTH

Auth that works

Password, magic link, OTP, OAuth (Google, GitHub), anonymous sign-in, and TOTP MFA, all wired straight into Postgres RLS.

API

PostgREST-compatible

Filtering, embeds, aggregates, pagination, and RPC. The same query surface your supabase-js code already speaks.

FUNCTIONS

Code functions

JavaScript ESM handlers at /functions/v1/<name>. Each one gets ctx.supabase, secrets, and structured logging.

STORAGE

Storage

Upload and download with local or S3 backends. Bucket policies run through RLS, the same model as your tables.

DEPLOY

Deploy anywhere

One binary. Docker, AWS Lambda, or bare metal: one command to run, one YAML file to configure.

Ready to build?

One command to install. One YAML file to start.

Get started S All install options

A lightweight backend,in one YAML file.