replit-hello-world

name	replit-hello-world
description	Create a minimal working Replit app with database, object storage, and auth. Use when starting a new Replit project, testing your setup, or learning Replit's built-in services (DB, Auth, Object Storage). Trigger with phrases like "replit hello world", "replit starter", "replit quick start", "first replit app", "replit example".
allowed-tools	Read, Write, Edit, Bash(npm:*), Bash(pip:*)
version	1.12.0
license	MIT
author	Jeremy Longshore <[e-mail]>
tags	["saas","replit","starter","database","api"]
compatibility	Designed for Claude Code, also compatible with Codex and OpenClaw

Replit Hello World

Overview

Build a working Replit app that demonstrates core platform services: Express/Flask server, Replit Database (key-value store), Object Storage (file uploads), Auth (user login), and PostgreSQL. Produces a running app you can deploy.

Prerequisites

• Replit App created (template or blank)
• .replit and replit.nix configured (see replit-install-auth)
• Node.js 18+ or Python 3.10+

Instructions

Step 1: Node.js — Express + Replit Database

// index.ts
import express from 'express';
import Database from '@replit/database';

const app = express();
const db = new Database();
app.use(express.json());

// Health check with Replit env vars
app.get('/health', (req, res) => {
  res.json({
    status: 'ok',
    repl: process.env.REPL_SLUG,
    owner: process.env.REPL_OWNER,
    timestamp: new Date().toISOString(),
  });
});

// Replit Key-Value Database CRUD
// Limits: 50 MiB total, 5,000 keys, 1 KB per key, 5 MiB per value
app.post('/api/items', async (req, res) => {
   { key, value } = req.;
   db.(key, value);
  res.({ : key });
});

app.(,  (req, res) => {
   value =  db.(req..);
   (value === )  res.().({ :  });
  res.({ : req.., value });
});

app.(,  (req, res) => {
   prefix = (req..  ) || ;
   keys =  db.(prefix);
  res.({ keys });
});

app.(,  (req, res) => {
   db.(req..);
  res.({ : req.. });
});

  = process.. || ;
app.(,  {
  .();
  .();
});