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Dokerfile

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+FROM node:20-bookworm
+
+# Install Chromium dependencies
+RUN apt-get update && apt-get install -y \
+    chromium \
+    fonts-liberation \
+    libatk-bridge2.0-0 \
+    libatk1.0-0 \
+    libcups2 \
+    libdrm2 \
+    libgbm1 \
+    libnspr4 \
+    libnss3 \
+    libxkbcommon0 \
+    libxcomposite1 \
+    libxrandr2 \
+    libxdamage1 \
+    libpango-1.0-0 \
+    libpangocairo-1.0-0 \
+    libasound2 \
+    ca-certificates \
+    dumb-init \
+    --no-install-recommends \
+ && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY package.json .
+RUN npm install --omit=dev
+
+COPY server.js .
+
+ENV NODE_ENV=production
+ENV PUPPETEER_EXECUTABLE_PATH=/usr/bin/chromium
+
+EXPOSE 3000
+
+ENTRYPOINT ["dumb-init", "--"]
+CMD ["node", "server.js"]

package.json

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+{
+  "name": "puppeteer-pdf-service",
+  "version": "1.0.0",
+  "type": "module",
+  "dependencies": {
+    "express": "^4.19.2",
+    "puppeteer": "^22.8.0"
+  }
+}

server.js

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+import express from "express";
+import puppeteer from "puppeteer";
+
+const app = express();
+app.use(express.json({ limit: "10mb" }));
+
+const PORT = process.env.PORT || 7860; // IMPORTANT
+
+app.post("/pdf", async (req, res) => {
+  try {
+    const { html, options = {} } = req.body;
+
+    if (!html) {
+      return res.status(400).json({ error: "Missing HTML" });
+    }
+
+    const browser = await puppeteer.launch({
+      executablePath: process.env.PUPPETEER_EXECUTABLE_PATH,
+      args: [
+        "--no-sandbox",
+        "--disable-dev-shm-usage",
+        "--disable-setuid-sandbox",
+        "--disable-gpu",
+        "--no-zygote"
+      ],
+    });
+
+    const page = await browser.newPage();
+    await page.setContent(html, { waitUntil: "networkidle0" });
+
+    const pdf = await page.pdf({
+      format: "A4",
+      printBackground: true,
+      ...options
+    });
+
+    await browser.close();
+
+    res.setHeader("Content-Type", "application/pdf");
+    res.send(pdf);
+  } catch (err) {
+    console.error(err);
+    res.status(500).json({ error: err.message });
+  }
+});
+
+/* Optional but recommended root route */
+app.get("/", (_req, res) => {
+  res.send("Puppeteer PDF Service is running");
+});
+
+app.listen(PORT, () => {
+  console.log(`Puppeteer PDF service running on port ${PORT}`);
+});