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routes/README.md

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+# Routes Folder
+
+Routes define routes within your application. Fastify provides an
+easy path to a microservice architecture, in the future you might want
+to independently deploy some of those.
+
+In this folder you should define all the routes that define the endpoints
+of your web application.
+Each service is a [Fastify
+plugin](https://www.fastify.io/docs/latest/Plugins/), it is
+encapsulated (it can have its own independent plugins) and it is
+typically stored in a file; be careful to group your routes logically,
+e.g. all `/users` routes in a `users.js` file. We have added
+a `root.js` file for you with a '/' root added.
+
+If a single file become too large, create a folder and add a `index.js` file there:
+this file must be a Fastify plugin, and it will be loaded automatically
+by the application. You can now add as many files as you want inside that folder.
+In this way you can create complex routes within a single monolith,
+and eventually extract them.
+
+If you need to share functionality between routes, place that
+functionality into the `plugins` folder, and share it via
+[decorators](https://www.fastify.io/docs/latest/Decorators/).
+
+If you're a bit confused about using `async/await` to write routes, you would
+better take a look at [Promise resolution](https://www.fastify.io/docs/latest/Routes/#promise-resolution) for more details.

routes/root.js

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+"use strict";
+
+const fs = require("fs");
+const util = require("util");
+const path = require("path");
+const { pipeline } = require("stream");
+const pump = util.promisify(pipeline);
+const crypto = require("crypto");
+const mime = require("mime-types");
+const exec = util.promisify(require("child_process").execFile);
+
+const UPLOAD_PATH = "./uploads";
+
+module.exports = async function (fastify, opts) {
+  fastify.register(require("fastify-multipart"));
+  fastify.post("/ocr", async function (req, reply) {
+    const data = await req.file();
+    const uid = crypto.randomBytes(16).toString("hex");
+    const filename = `${UPLOAD_PATH}/${uid}.${mime.extension(data.mimetype)}`;
+    const lang = "mal+eng";
+    await pump(data.file, fs.createWriteStream(filename));
+    const args = [filename, "stdout", "-l", lang];
+    const { stdout, stderr } = await exec("tesseract", args);
+    exec("rm", ["-f", filename]);
+    return {
+      text: stdout,
+      error: stderr,
+    };
+  });
+};