created basic backend, with simple routes

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
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+*.pid.lock
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+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
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+# Coverage directory used by tools like istanbul
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+# nyc test coverage
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+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
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+# Bower dependency directory (https://bower.io/)
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+# node-waf configuration
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+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
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+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
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+# Optional npm cache directory
+.npm
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+# Optional eslint cache
+.eslintcache
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+# Optional stylelint cache
+.stylelintcache
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+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
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+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
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+# vuepress v2.x temp and cache directory
+.temp
+.cache
+
+# vitepress build output
+**/.vitepress/dist
+
+# vitepress cache directory
+**/.vitepress/cache
+
+# Docusaurus cache and generated files
+.docusaurus
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
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+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*

package.json

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+{
+  "name": "crab-webapp",
+  "description": "Crab Webapp",
+  "main": "src/server.js",
+  "scripts": {
+    "start": "node src/server.js",
+    "dev": "nodemon src/server.js"
+  },
+  "dependencies": {
+    "express": "^4.18.2",
+    "cors": "^2.8.5",
+    "dotenv": "^16.3.1"
+  },
+  "devDependencies": {
+    "nodemon": "^3.0.2"
+  }
+} 

src/routes/index.js

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+const express = require('express');
+const router = express.Router();
+
+// Routes
+router.get('/', (req, res) => {
+  res.json({ message: 'Welcome to the Express backend!' });
+});
+
+// Example route
+router.get('/api/hello', (req, res) => {
+  res.json({ message: 'Hello from the backend!' });
+});
+
+module.exports = router; 

src/server.js

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+const express = require('express');
+const cors = require('cors');
+require('dotenv').config();
+
+const routes = require('./routes');
+
+const app = express();
+const port = process.env.PORT || 3000;
+
+// Middleware
+app.use(cors());
+app.use(express.json());
+
+// Use routes
+app.use('/', routes);
+
+// Start server
+app.listen(port, () => {
+  console.log(`Server is running on port ${port}`);
+});