Export block devices as JSON
Build a paste-ready command, then review its compatibility and effects before running it.
lsblk -J -o NAME,SIZE,TYPE,MOUNTPOINTSread-onlyno known side effects Compatibility
LinuxVerified for Linux using posix, bash, zsh syntax.
Operational knowledgereview due 2027-01-20
Requirementslsblklsblk must be installed and available on PATH.
Version supportlsblk Current supported releasesVerified for linux using posix, bash, zsh syntax; consult compatibility notes for platform-specific differences.
Expected signals{Representative successful output; values vary with the selected target and system state.
Known errorslsblk: command not foundlsblk is missing or is not available on PATH.
Verifylsblk -J -o NAME,SIZE,TYPE,MOUNTPOINTSThe output matches the expected target and exits without an error.Rollback noteNot required: this command is read-only and does not change system state.
Command breakdown
01lsblkCommandRuns the lsblk stage of this one-liner.
02-JOptionConfigures lsblk with the -J option.
03-oOptionSelects an output file or output format for this command.
04NAME,SIZE,TYPE,MOUNTPOINTSArgumentPasses NAME,SIZE,TYPE,MOUNTPOINTS to lsblk.
Example input
lsblk -J -o NAME,SIZE,TYPE,MOUNTPOINTS
Example output
{
"blockdevices": [{"name":"sda","size":"100G","type":"disk","mountpoints":[null]}]
}
Illustrative output — exact values vary by system and data.
Official sources