Node.js Command Line Options
Node.js provides a wide range of command line options that make it more flexible for developers. These options allow you to execute scripts, check syntax, load modules, manage warnings, and much more.
In this guide from UpdateGadh, we’ll explore the most commonly used Node.js command line options along with examples.
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List of Node.js Command Line Options
| Index | Option | Description |
|---|---|---|
| 1. | -v, --version | Prints the Node.js version. |
| 2. | -h, --help | Displays all available command line options. |
| 3. | -e, --eval "script" | Evaluates the provided argument as JavaScript. REPL predefined modules can also be used. |
| 4. | -p, --print "script" | Works like -e, but also prints the result. |
| 5. | -c, --check | Performs a syntax check without running the script. |
| 6. | -i, --interactive | Opens the REPL even when stdin is not a terminal. |
| 7. | -r, --require module | Preloads a module at startup (by path or module name). |
| 8. | --no-deprecation | Suppresses deprecation warnings. |
| 9. | --trace-deprecation | Prints stack traces for deprecations. |
| 10. | --throw-deprecation | Throws errors for deprecations. |
| 11. | --no-warnings | Suppresses all process warnings. |
| 12. | --trace-warnings | Prints stack traces for all warnings. |
| 13. | --trace-sync-io | Shows a stack trace when synchronous I/O occurs after the event loop begins. |
| 14. | --zero-fill-buffers | Automatically fills newly allocated buffers with zeros. |
| 15. | --track-heap-objects | Tracks heap object allocations for snapshots. |
| 16. | --prof-process | Processes V8 profiler output generated with --prof. |
| 17. | --v8-options | Prints V8 command line options. |
| 18. | --tls-cipher-list=list | Specifies an alternative TLS cipher list (requires crypto support). |
| 19. | --enable-fips | Enables FIPS-compliant crypto at startup (requires special build). |
| 20. | --force-fips | Forces FIPS crypto at startup and cannot be disabled in scripts. |
| 21. | --icu-data-dir=file | Sets the ICU data load path (overrides NODE_ICU_DATA). |
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Node.js Command Line Options Examples
1. Check Node.js Version
node -v
# or
node --version
2. Get Help
node -h
# or
node --help
3. Evaluate a Script (without printing result)
node -e "console.log('Hello from UpdateGadh')"
4. Evaluate a Script and Print Result
node -p "2 + 3"
5. Open REPL Even If stdin Is Not a Terminal
node -i
# or
node --interactive
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Final Thoughts
Command line options in Node.js are powerful tools that make development smoother. Whether you’re debugging, checking syntax, or preloading modules, knowing these options will save time and effort.
For more Node.js tips and guides, stay connected with UpdateGadh.
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