How to install bcrypt in ubuntu 18.04 [closed] - npm-install

Question

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.
This question does not appear to be about a specific programming problem, a software algorithm, or software tools primarily used by programmers. If you believe the question would be on-topic on another Stack Exchange site, you can leave a comment to explain where the question may be able to be answered.
Closed 3 years ago.
Improve this question
When I tried to install bcrypt in Ubuntu 18.04 by command "sudo npm install bcrypt --save" I get an error:
node-pre-gyp WARN Using needle for node-pre-gyp https download
node-pre-gyp WARN Pre-built binaries not installable for bcrypt#3.0.6 and node#10.16.3 (node-v64 ABI, glibc) (falling back to source compile with node-gyp)
node-pre-gyp WARN Hit error EACCES: permission denied, mkdir '/home/xuanhoang/NodeJS/Udemy/node_modules/bcrypt/lib'
gyp ERR! configure error
gyp ERR! stack Error: EACCES: permission denied, mkdir '/home/xuanhoang/NodeJS/Udemy/node_modules/bcrypt/build'
gyp ERR! System Linux 5.0.0-25-generic
gyp ERR! command "/usr/bin/node" "/usr/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "configure" "--fallback-to-build" "--module=/home/xuanhoang/NodeJS/Udemy/node_modules/bcrypt/lib/binding/bcrypt_lib.node" "--module_name=bcrypt_lib" "--module_path=/home/xuanhoang/NodeJS/Udemy/node_modules/bcrypt/lib/binding" "--napi_version=4" "--node_abi_napi=napi" "--napi_build_version=0" "--node_napi_label=node-v64"
gyp ERR! cwd /home/xuanhoang/NodeJS/Udemy/node_modules/bcrypt
gyp ERR! node -v v10.16.3
gyp ERR! node-gyp -v v3.8.0
gyp ERR! not ok
node-pre-gyp ERR! build error
node-pre-gyp ERR! stack Error: Failed to execute '/usr/bin/node /usr/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js configure --fallback-to-build --module=/home/xuanhoang/NodeJS/Udemy/node_modules/bcrypt/lib/binding/bcrypt_lib.node --module_name=bcrypt_lib --module_path=/home/xuanhoang/NodeJS/Udemy/node_modules/bcrypt/lib/binding --napi_version=4 --node_abi_napi=napi --napi_build_version=0 --node_napi_label=node-v64' (1)
node-pre-gyp ERR! stack at ChildProcess.<anonymous> (/home/xuanhoang/NodeJS/Udemy/node_modules/node-pre-gyp/lib/util/compile.js:83:29)
node-pre-gyp ERR! stack at ChildProcess.emit (events.js:198:13)
node-pre-gyp ERR! stack at maybeClose (internal/child_process.js:982:16)
node-pre-gyp ERR! stack at Process.ChildProcess._handle.onexit (internal/child_process.js:259:5)
node-pre-gyp ERR! System Linux 5.0.0-25-generic
node-pre-gyp ERR! command "/usr/bin/node" "/home/xuanhoang/NodeJS/Udemy/node_modules/.bin/node-pre-gyp" "install" "--fallback-to-build"
node-pre-gyp ERR! cwd /home/xuanhoang/NodeJS/Udemy/node_modules/bcrypt
node-pre-gyp ERR! node -v v10.16.3
node-pre-gyp ERR! node-pre-gyp -v v0.12.0
node-pre-gyp ERR! not ok
Failed to execute '/usr/bin/node /usr/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js configure --fallback-to-build --module=/home/xuanhoang/NodeJS/Udemy/node_modules/bcrypt/lib/binding/bcrypt_lib.node --module_name=bcrypt_lib --module_path=/home/xuanhoang/NodeJS/Udemy/node_modules/bcrypt/lib/binding --napi_version=4 --node_abi_napi=napi --napi_build_version=0 --node_napi_label=node-v64' (1)
npm WARN udemy#1.0.0 No description
npm WARN udemy#1.0.0 No repository field.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! bcrypt#3.0.6 install: `node-pre-gyp install --fallback-to-build`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the bcrypt#3.0.6 install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! /home/xuanhoang/.npm/_logs/2019-09-01T08_14_32_072Z-debug.log

Answer 1

The following line:
EACCES: permission denied, mkdir '/home/xuanhoang/NodeJS/Udemy/node_modules/bcrypt/build'
indicates that the sudo user doesn't have permission to write to this file.
This can be fixed by removing the node_modules folder and installing the dependency again:
sudo rm -rf node_modules
npm i
npm install bcrypt --save
The --save flag is enabled by default when using the latest npm command.