json_xs - JSON::XS commandline utility


   json_xs [-v] [-f inputformat] [-t outputformat]


json_xs converts between some input and output formats (one of them is JSON).

The default input format is json and the default output format is json-pretty.



Be slightly more verbose.

-f fromformat

Read a file in the given format from STDIN.

fromformat can be one of:

json - a json text encoded, either utf-8, utf16-be/le, utf32-be/le
storable - a Storable frozen value
storable-file - a Storable file (Storable has two incompatible formats)
clzf - Compress::LZF format (requires that module to be installed)
yaml - YAML (avoid at all costs, requires the YAML module :)
eval - evaluate the given code as (non-utf-8) Perl, basically the reverse of "-t dump"
-t toformat

Write the file in the given format to STDOUT.

toformat can be one of:

json, json-utf-8 - json, utf-8 encoded
json-pretty - as above, but pretty-printed
json-utf-16le, json-utf-16be - little endian/big endian utf-16
json-utf-32le, json-utf-32be - little endian/big endian utf-32
storable - a Storable frozen value in network format
storable-file - a Storable file in network format (Storable has two incompatible formats)
clzf - Compress::LZF format
yaml - YAML
dump - Data::Dump
dumper - Data::Dumper

Note that Data::Dumper doesn't handle self-referential data structures correctly - use "dump" instead.


   json_xs -t null <isitreally.json

"JSON Lint" - tries to parse the file isitreally.json as JSON - if it is valid JSON, the command outputs nothing, otherwise it will print an error message and exit with non-zero exit status.

   <src.json json_xs >pretty.json

Prettify the JSON file src.json to dst.json.

   json_xs -f storable-file <file

Read the serialised Storable file file and print a human-readable JSON version of it to STDOUT.

   json_xs -f storable-file -t yaml <file

Same as above, but write YAML instead (not using JSON at all :)

   lwp-request | json_xs

Fetch the cpan-testers result summary JSON::XS and pretty-print it.


Copyright (C) 2008 Marc Lehmann <>