Error: EROFS: read-only file system [MAC]

I have an npm project in location:


npm run build runs this script 'sh devDependencies/'. Location of the script is here ~/dev/projectdevDependencies/ I’m running the script in ~/dev/project. contents:

echo creating build/ folder
mkdir -m 0777 build 

echo copy /js/
cp -R js build/
chmod 0777 -R build/js

echo [changing rights] index.js
chmod 0777 build/js/index.js
browserify build/js/index.js -o /build/js/build.js

I get an error:

Error: EROFS: read-only file system, mkdir '/build'
    at Object.mkdirSync (fs.js:987:3)
    at sync (/usr/local/lib/node_modules/browserify/node_modules/mkdirp-classic/index.js:71:13)
    at Function.sync (/usr/local/lib/node_modules/browserify/node_modules/mkdirp-classic/index.js:77:24)
    at Object.<anonymous> (/usr/local/lib/node_modules/browserify/bin/cmd.js:64:12)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
    at Module.load (internal/modules/cjs/loader.js:928:32)
    at Function.Module._load (internal/modules/cjs/loader.js:769:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
    at internal/main/run_main_module.js:17:47 {
  errno: -30,
  syscall: 'mkdir',
  code: 'EROFS',
  path: '/build'

ls -l:

-rw-r--r--  1 sander  wheel  218175 Mar  9 14:28 bundle.js
-rw-r--r--  1 sander  wheel    7869 Mar  9 14:28 index.js

There are read and write access?

I have tried running the script in /tmp folder which gives the same result.

I have tried running as sudo which also gives same result.

I don’t think I should run this command csrutil disable because that would be too extreme.

Where should I put my project so that I don’t have this issue?


Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

The problem is with this line:

browserify build/js/index.js -o /build/js/build.js

You should not have -o /build/js/, because that points to entirely different place than build/js/.

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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