tsx Has a Free API That Runs TypeScript Files Instantly Without Compilation

tsx is the fastest way to run TypeScript in Node.js. No tsconfig. No build step. Just tsx file.ts and it runs.

Run TypeScript Instantly

# Run any .ts file
tsx server.ts

# Run .tsx files
tsx app.tsx

# Watch mode — auto-restart on changes
tsx watch server.ts

# Run with Node.js flags
tsx --inspect server.ts
tsx --env-file=.env server.ts

Why tsx Over ts-node?

Feature	tsx	ts-node
Startup	Instant (esbuild)	Slow (tsc)
Config needed	None	tsconfig.json
ESM support	Works	Complicated
CJS support	Works	Works
Watch mode	Built-in	Needs nodemon
Path aliases	Automatic	Needs config

Use Cases

Scripts

// scripts/seed-db.ts
import { PrismaClient } from "@prisma/client";

const prisma = new PrismaClient();

const products = [
  { title: "Widget", price: 29.99, url: "https://example.com/widget" },
  { title: "Gadget", price: 49.99, url: "https://example.com/gadget" },
];

for (const product of products) {
  await prisma.product.create({ data: product });
}

console.log(`Seeded ${products.length} products`);
await prisma.$disconnect();

tsx scripts/seed-db.ts

Quick API Server

// server.ts
import express from "express";

const app = express();
app.get("/api/health", (req, res) => res.json({ status: "ok" }));
app.listen(3000, () => console.log("Running on :3000"));

tsx watch server.ts

Data Processing

// process.ts
import { readFileSync, writeFileSync } from "fs";
import { parse } from "csv-parse/sync";

const csv = readFileSync("data.csv", "utf-8");
const records: { title: string; price: string; url: string }[] = parse(csv, { columns: true });

const processed = records
  .filter(r => parseFloat(r.price) < 50)
  .map(r => ({ ...r, price: parseFloat(r.price) }));

writeFileSync("output.json", JSON.stringify(processed, null, 2));
console.log(`Processed ${processed.length} records`);

package.json Scripts

{
  "scripts": {
    "dev": "tsx watch src/index.ts",
    "start": "tsx src/index.ts",
    "seed": "tsx scripts/seed.ts",
    "migrate": "tsx scripts/migrate.ts",
    "test": "tsx --test src/**/*.test.ts"
  }
}

Node.js Loader (Alternative)

# Register tsx as a Node.js loader
node --import tsx src/index.ts

# Or in package.json
"scripts": {
  "start": "node --import tsx src/index.ts"
}

This is useful when you need full Node.js flag control.

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