Question 1

How to install bcrypt on Windows without errors?

Accepted Answer

Ensure you have Visual Studio with C++ build tools and Python installed, then run npm install bcrypt. If issues persist, check the project's wiki for detailed setup, as pre-built binaries might not cover all Node versions, and errors often relate to missing dependencies.

Question 2

bcrypt vs argon2: which is better for password hashing?

Accepted Answer

Bcrypt is a well-established standard with wide library support and is still considered secure for most use cases. Argon2 is a newer algorithm that won the Password Hashing Competition and offers better resistance to GPU attacks, but bcrypt is often preferred in Node.js due to its maturity and native integration in this library.

Question 3

How to increase the bcrypt work factor for more security?

Accepted Answer

Pass a higher number as the saltRounds parameter when hashing, e.g., bcrypt.hash(password, 12). Each increment doubles the computational cost, so balance it based on your server's capacity, as illustrated in the performance table in the README showing hash times per round.

Question 4

Why does bcrypt compare return false even with the correct password?

Accepted Answer

This could be due to encoding issues, as bcrypt uses UTF-8 for strings and only hashes the first 72 bytes. Check for multi-byte characters or extra bytes, and ensure the hash was generated with the same version, as compatibility with other languages isn't guaranteed.

Question 5

Is it safe to use bcrypt sync methods in production?

Accepted Answer

No, the README explicitly recommends against synchronous methods because they block the event loop, which can degrade server performance under load. Always use async APIs with callbacks or promises to avoid blocking, especially for CPU-intensive hashing.

Question 6

How to use bcrypt with async/await in modern Node.js?

Accepted Answer

Import bcrypt and use the async methods that return promises, then await them. For example: const match = await bcrypt.compare(password, hash). The library supports native promises and can be customized with bcrypt.promises.use() for alternative implementations.

node.bcrypt.js

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