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Build a scalable web scraping API with Lovable, a step-by-step guide for setup, proxies, data extraction, error handling and deployment
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Build a small serverless scraping API inside your Lovable app by adding an API route that fetches a target URL (using global fetch), extracts safe fields (title, meta description, visible text snippet) with lightweight parsing, and use Lovable Cloud Secrets for a custom User-Agent. Do this entirely in Chat Mode: ask Lovable to create/modify files, add a simple API handler, add env-secret references, Preview to test, and Publish. If you need advanced HTML parsing (cheerio) or native packages, sync/export to GitHub and run npm install outside Lovable — I’ll mark that step clearly.
A minimal, production-friendly web-scraping API endpoint inside your Lovable project that:
In Chat Mode, ask Lovable to create a serverless API file (pages/api/scrape.js). Use the Preview feature to call /api/scrape?url=... and inspect JSON. Configure the User-Agent via Lovable Cloud Secrets UI (no CLI). If you later need native npm deps (cheerio), export to GitHub from Lovable and run npm install locally or in your CI — that is an outside-Lovable (terminal required) step.
export default async function handler(req, res) {
// allow only GET
if (req.method !== 'GET') return res.status(405).json({ error: 'Method not allowed' });
const url = (req.query.url || '').toString();
const selector = (req.query.selector || '').toString(); // optional, not full CSS engine
if (!url || !/^https?:///i.test(url)) return res.status(400).json({ error: 'Provide a valid url query' });
// use Lovable Cloud Secret SCRAPER_USER_AGENT if present
const userAgent = process.env.SCRAPER_USER_AGENT || 'LovableScraper/1.0 (+https://your-app.example)';
try {
const resp = await fetch(url, { headers: { 'User-Agent': userAgent, 'Accept-Language': 'en-US,en;q=0.9' } });
if (!resp.ok) return res.status(502).json({ error: 'Upstream fetch failed', status: resp.status });
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const text = await resp.text();
// very small, safe parsers using regex (works for basic pages)
const titleMatch = text.match(/<title[^>]\*>([^<]+)</title>/i);
const title = titleMatch ? titleMatch[1].trim() : null;
const descMatch = text.match(/<meta\s+name=["']description["']\s+content=["']([^%22']+)["']/i) ||
text.match(/<meta\s+property=["']og:description["']\s+content=["']([^%22']+)["']/i);
const description = descMatch ? descMatch[1].trim() : null;
// crude snippet: strip tags and take first 400 chars
const visible = text.replace(/<script[\s\S]\*?</script>/gi, '')
.replace(/<style[\s\S]\*?</style>/gi, '')
.replace(/</?[^>]+(>|$)/g, ' ')
.replace(/\s+/g, ' ')
.trim()
.slice(0, 400);
// optional simple selector support: only for id (#id) and element tags (tag)
let selected = null;
if (selector) {
if (selector.startsWith('#')) {
const id = selector.slice(1).replace(/[-/\\^$\*+?.()|[]{}]/g, '\\$&');
const m = text.match(new RegExp(`<[^>]+id=["']${id}["'][^>]*>([\\s\\S]*?)<\\/[^>]+>`, 'i'));
selected = m ? m[1].replace(/</?[^>]+(>|$)/g, '').trim().slice(0, 1000) : null;
} else {
// tag name
const tag = selector.replace(/[^a-z0-9]/gi, '').toLowerCase();
const m = text.match(new RegExp(`<${tag}[^>]*>([\\s\\S]*?)<\\/${tag}>`, 'i'));
selected = m ? m[1].replace(/</?[^>]+(>|$)/g, '').trim().slice(0, 1000) : null;
}
}
return res.status(200).json({ url, title, description, snippet: visible.slice(0,200), selected });
} catch (err) {
return res.status(500).json({ error: 'Internal error', message: String(err) });
}
}
```
Validity bar: This uses only Lovable-native actions (Chat Mode edits, Preview, Secrets UI, Publish). Any npm installs or native binary work is explicitly labeled as outside Lovable and requires GitHub sync + terminal.
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This prompt helps an AI assistant understand your setup and guide to build the feature
This prompt helps an AI assistant understand your setup and guide to build the feature
This prompt helps an AI assistant understand your setup and guide to build the feature
Connect with our team to unlock the full potential of no-code solutions with a no-commitment consultation!
Book a call with an Expert
Starting a new venture? Need to upgrade your web app? RapidDev builds application with your growth in mind.
Keep it simple, safe, and review everything the AI generates. Build a small, well-scoped HTTP endpoint that fetches pages with timeouts/retries, parses with a DOM parser (cheerio), enforces an allowlist/SSRF protection, uses caching and rate-limiting, and keeps credentials (proxy/API keys) in Lovable Secrets. Use AI code generators to scaffold and tests, but manually inspect selectors, edge cases, and legal constraints before publishing. In Lovable, make edits in Chat Mode, store secrets in the Secrets UI, validate with Preview, and sync/export to GitHub for real deployment — you cannot run arbitrary terminal commands inside Lovable, so dependency and deployment steps must go through GitHub/CI or your hosting provider.
// package.json snippet to add dependencies
{
"name":"scrape-api",
"version":"1.0.0",
"main":"index.js",
"dependencies":{
"axios":"^1.5.0",
"cheerio":"^1.0.0-rc.12",
"express":"^4.18.2",
"lru-cache":"^10.0.0"
}
}
// index.js
const express = require('express');
const axios = require('axios');
const cheerio = require('cheerio');
const LRU = require('lru-cache');
const { URL } = require('url');
const app = express();
const cache = new LRU({ max: 500, ttl: 1000 * 60 * 2 }); // 2m cache
// simple allowlist from env (comma separated domains)
// set via Lovable Secrets UI: ALLOWED_DOMAINS=example.com,news.example.org
const allowed = (process.env.ALLOWED_DOMAINS || '').split(',').map(s => s.trim()).filter(Boolean);
function isAllowedUrl(raw) {
try {
const u = new URL(raw);
return allowed.length === 0 || allowed.includes(u.hostname);
} catch {
return false;
}
}
async function fetchWithRetry(url, opts = {}) {
const maxAttempts = 3;
let attempt = 0;
let lastErr;
while (attempt < maxAttempts) {
attempt++;
try {
// allow proxy via SCRAPE_PROXY env (e.g., https://proxy.example?target=)
const proxyPrefix = process.env.SCRAPE_PROXY || '';
const target = proxyPrefix ? proxyPrefix + encodeURIComponent(url) : url;
const res = await axios.get(target, {
timeout: 10000, // 10s timeout
headers: {
'User-Agent': 'MyScraperBot/1.0 (+https://your.site/)',
'Accept-Language': 'en-US,en;q=0.9'
},
validateStatus: s => s >= 200 && s < 400,
...opts
});
return res.data;
} catch (err) {
lastErr = err;
// small exponential backoff
await new Promise(r => setTimeout(r, 200 * Math.pow(2, attempt)));
}
}
throw lastErr;
}
app.get('/scrape', async (req, res) => {
const url = req.query.url;
if (!url || !isAllowedUrl(url)) {
return res.status(400).json({ error: 'invalid or disallowed url' });
}
const key = `html:${url}`;
if (cache.has(key)) {
return res.json({ fromCache: true, data: cache.get(key) });
}
try {
const html = await fetchWithRetry(url);
const $ = cheerio.load(html);
// example extraction — adjust to target page
const title = $('meta[property="og:title"]').attr('content') || $('title').text().trim();
const description = $('meta[name="description"]').attr('content') || $('meta[property="og:description"]').attr('content') || '';
const result = { title, description, url };
cache.set(key, result);
res.json({ fromCache: false, data: result });
} catch (err) {
// classify common failures
if (err.response && err.response.status === 429) {
return res.status(429).json({ error: 'upstream rate limit' });
}
res.status(500).json({ error: 'fetch_failed', detail: err.message });
}
});
const port = process.env.PORT || 3000;
app.listen(port, () => console.log('listening', port));
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