Technologies Coding Problems Bookmarks Learning Paths

Technologies Coding Problems Bookmarks Learning Paths

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How can you delete a file in Node.js? | File Operations | nodejs Interview Questions | NextRound.in

Questions

7 of 16

1How can you check if a given path is a file or a directory in Node.js?

2How can you watch for file changes in a directory using Node.js?

3What is the purpose of the `fs.exists()` method in Node.js?

4What is the difference between `fs.unlink()` and `fs.unlinkSync()` in Node.js?

5What is the purpose of the `fs.rmdir()` method in Node.js, and how can you delete a directory with it?

6What is the purpose of the `fs.mkdir()` method in Node.js, and how can you create directories with it?

7How can you delete a file in Node.js?

8How do you read a file synchronously in Node.js?

9How do you read a file asynchronously in Node.js?

10Explain what the `fs.readdir()` method is used for in Node.js.

11How can you append data to an existing file in Node.js?

12How can you recursively list all files and directories in a given directory using Node.js?

13How can you rename a file or directory in Node.js?

14Explain the difference between `fs.readFile()` and `fs.createReadStream()` for reading files in Node.js.

15What is the purpose of the `fs.createReadStream()` and `fs.createWriteStream()` methods in Node.js?

16Explain how to write to a file in Node.js?

nodejs

File Operations

Performance Optimisation

07 / 16

How can you delete a file in Node.js?

Difficulty: 2/10

fs module, asynchronous APIs, error handling

You can delete a file in Node.js using the `fs.unlink()` method. Here's an example:

javascript

Scenario Questions

0-2 years experience

1We have a temporary log file that should be removed after we finish processing it. Which Node.js API would you use and how would you handle any errors?
2If you call fs.unlinkSync on a path that doesn't exist, what happens and how would you guard against it?
3Write a short snippet that deletes a file asynchronously and logs either success or the error that occurred.

Follow-up Questions

What would you do if the deletion fails because of a permission error?
How would you test that your file‑deletion logic works correctly?
Can you describe how you would monitor file deletions in production?

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2-5 years experience

1Your image‑processing service deletes the original upload after resizing, but you sometimes see EBUSY errors. How would you investigate and resolve this?
2You need to delete a batch of files in parallel but limit concurrency to avoid overwhelming the disk. How would you implement that in Node?
3Explain the trade‑offs between using fs.unlink and the newer fs.rm with the recursive option when cleaning up a directory.

5-8 years experience

1Design a cleanup subsystem that periodically removes old temporary files across multiple servers, ensuring no race conditions and minimal I/O impact. What components and patterns would you choose?
2How would you add audit logging and a rollback capability to a high‑throughput service that deletes files, while keeping performance acceptable?
3Discuss the performance implications of using synchronous versus asynchronous file deletion inside a request‑response cycle under heavy load.

8+ years experience

1Our monolithic Node.js app currently deletes files directly. We’re moving to a microservices architecture with a dedicated storage service. What architectural changes, contracts, and migration steps would you propose?
2How would you establish organization‑wide guidelines for file deletion to satisfy compliance, retention policies, and cross‑team responsibilities?
3If you need to delete billions of files stored on a distributed filesystem, what strategies would you use to ensure scalability, consistency, and minimal disruption?