jose-fmt(1)
===========
:doctype: manpage

== NAME

jose-fmt - Converts JSON between serialization formats

== SYNOPSIS

*jose fmt* [OPTIONS]

== OVERVIEW

This *jose fmt* command provides a mechanism for building and parsing JSON
objects from the command line. It operates as a simple stack machine. All
commands operate on the TOP item of the stack and, occasionally, the PREV item
of the stack. Commands that require a specific type of value will indicate it
in parentheses. For example: "TOP (arr.)".

This program returns 0 on success or the index of the option which failed.

== OPTIONS

* *-0*, *--null* :
  Assert TOP to be null

* *-a*, *--append* :
  Append TOP to the end of PREV (arr.)

* *-a*, *--append* :
  Set missing values from TOP (obj.) into PREV (obj.)

* *-A*, *--array* :
  Assert TOP to be an array

* *-B*, *--boolean* :
  Assert TOP to be a boolean

* *-c*, *--copy* :
  Deep copy TOP, push onto TOP

* *-d* _NAME_, *--delete*=_NAME_ :
  Delete NAME from TOP (obj.)

* *-d* #, *--delete*=# :
  Delete # from TOP (arr.)

* *-d* -#, *--delete*=-# :
  Delete # from the end of TOP (arr.)

* *-e*, *--empty* :
  Erase all items from TOP (arr./obj.)

* *-E*, *--equal* :
  Assert TOP to be equal to PREV

* *-f* _FILE_, *--foreach*=_FILE_ :
  Write TOP (obj./arr.) to FILE, one line/item

* *-f* -, *--foreach*=- :
  Write TOP (obj./arr.) to STDOUT, one line/item

* *-F*, *--false* :
  Assert TOP to be false

* *-g* _NAME_, *--get*=_NAME_ :
  Get item with NAME from TOP (obj.), push to TOP

* *-g* #, *--get*=# :
  Get # item from TOP (arr.), push to TOP

* *-g* -#, *--get*=-# :
  Get # item from the end of TOP (arr.), push to TOP

* *-i* #, *--insert*=# :
  Insert TOP into PREV (arr.) at #

* *-I*, *--integer* :
  Assert TOP to be an integer

* *-j* _JSON_, *--json*=_JSON_ :
  Parse JSON constant, push onto TOP

* *-j* _FILE_, *--json*=_FILE_ :
  Read from FILE, push onto TOP

* *-j* -, *--json*=- :
  Read from STDIN, push onto TOP

* *-l*, *--length* :
  Push length of TOP (arr./str./obj.) to TOP

* *-M* #, *--move*=# :
  Move TOP back # places on the stack

* *-N*, *--number* :
  Assert TOP to be a number

* *-o* _FILE_, *--output*=_FILE_ :
  Write TOP to FILE

* *-o* -, *--output*=- :
  Write TOP to STDOUT

* *-O*, *--object* :
  Assert TOP to be an object

* *-q* _STR_, *--quote*=_STR_ :
  Convert STR to a string, push onto TOP

* *-Q*, *--query* :
  Query the stack by deep copying and pushing onto TOP

* *-R*, *--real* :
  Assert TOP to be a real

* *-s* _NAME_, *--set*=_NAME_ :
  Sets TOP into PREV (obj.) with NAME

* *-s* #, *--set*=# :
  Sets TOP into PREV (obj.) at #

* *-s* -#, *--set*=-# :
  Sets TOP into PREV (obj.) at # from the end

* *-S*, *--string* :
  Assert TOP to be a string

* *-t* #, *--truncate*=# :
  Shrink TOP (arr.) to length #

* *-t* -#, *--truncate*=-# :
  Discard last # items from TOP (arr.)

* *-T*, *--true* :
  Assert TOP to be true

* *-u* _FILE_, *--unquote*=_FILE_ :
  Write TOP (str.) to FILE without quotes

* *-u* -, *--unquote*=- :
  Write TOP (str.) to STDOUT without quotes

* *-U*, *--unwind* :
  Discard TOP from the stack

* *-x*, *--extend* :
  Append items from TOP to the end of PREV (arr.)

* *-x*, *--extend* :
  Set all values from TOP (obj.) into PREV (obj.)

* *-X*, *--not* :
  Invert the following assertion

* *-y*, *--b64load* :
  URL-safe Base64 decode TOP (str.), push onto TOP

* *-Y*, *--b64dump* :
  URL-safe Base64 encode TOP, push onto TOP

== EXAMPLES

Extract the *alg* parameter from a JWE Protected Header:

    $ jose fmt -j "$jwe" -Og protected -yOg alg -Su-
    A128KW

List all JWKs in a JWKSet (one per line):

    $ echo "$jwkset" | jose fmt -j- -Og keys -Af-
    {"kty":"oct",...}
    {"kty":"EC",...}

Change the algorithm in a JWK:

    $ echo "$jwk" | jose fmt -j- -j '"A128GCM"' -s alg -Uo-
    {"kty":"oct","alg":"A128GCM",...}

Build a JWE template:

    $ jose fmt -j '{}' -cs unprotected -q A128KW -s alg -UUo-
    {"unprotected":{"alg":"A128KW"}}

== AUTHOR

Nathaniel McCallum <npmccallum@redhat.com>