Web Reference: Jan 16, 2026 · In this guide, we’ll demystify this error, break down its root causes, and provide a step-by-step solution to fix it—specifically for projects using CommonJS (CJS) modules (the default module system for Node.js). May 30, 2020 · Try running ts-node with the --esm flag. That fixed the ERR_UNKNOWN_FILE_EXTENSION error for me. I'm using Node 16.15.1 btw. ex: ts-node --esm myfile.ts Jan 8, 2024 · The [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ‘.ts’ error in Node.js can be resolved in multiple ways. Using ts-node is convenient for development, whereas compiling TypeScript to JavaScript is better suited for production deployments.
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