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Express

Add a file upload endpoint to an Express app that routes through Docex for vision analysis.

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Prerequisites

  • Express 4+
  • docexdev installed
  • multer or similar for file upload handling
  • DOCEX_API_KEY and DOCEX_BASE_URL configured

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Server

import express from "express";
import multer from "multer";
import { createDocex } from "docexdev";

const app = express();
const upload = multer({ storage: multer.memoryStorage() });

const docex = createDocex({
  apiKey: process.env.DOCEX_API_KEY,
  baseUrl: process.env.DOCEX_BASE_URL,
});

app.post("/api/analyze", upload.single("file"), async (req, res) => {
  try {
    const result = await docex.run({
      file: { fileName: req.file.originalname, data: req.file.buffer },
      prompt: req.body.prompt,
    });

    res.json(result);
  } catch (err) {
    res.status(err.status || 500).json({
      error: err.code,
      message: err.message,
      suggestion: err.suggestion,
    });
  }
});

app.listen(3000, () => console.log("Server running on http://localhost:3000"));

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Test

curl -X POST http://localhost:3000/api/analyze \
  -F "file=@invoice.pdf" \
  -F "prompt=Extract line items, totals, and vendor details"

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Environment variables

DOCEX_API_KEY=dx_live_...
DOCEX_BASE_URL=https://api.docex.dev
Keep DOCEX_API_KEY server-side only. Do not send it to the client.