parse JSON file by windows batch

jsonParser.bat

:: Read file "package.json" into variable string, removing line breaks.
set string=
for /f "delims=" %%x in (package.json) do set "string=!string!%%x"

rem Remove quotes
set string=%string:"=%
rem Remove braces
set "string=%string:~2,-2%"
rem Change colon+space by equal-sign
set "string=%string:: ==%"
rem Separate parts at comma into individual assignments
set "%string:, =" & set "%"

echo %version%

Just a dumb question, where is %version% defined in the script?

Just a dumb question, where is %version% defined in the script?

Let's suppose this is the package.json file the script tries to read :

{
 ...
 "version": "1.0.0",
 ...
}

Then Batch will take the key version from the JSON file as a new variable, which value is the version value linked into the JSON file. That's why you can't use this for huge objects such as this one :

{
 ...
 "version": {
    "debug": "1.0.0",
    "production": "1.0.1"
 },
 ...
}

You would not be able to get the debug and production value using version as key.

Nice code. Sample of package.json:

{ "dummy": "invisible", "dbpath": "c:\tmp", "dbname": "hidra" }

Some limitations:

• Spaces after first '{' and before last '}' are needed
• No spaces in keys and in values
  "msg": "Hi all" <-- prohibited
• One space is necessary after ':'
• First key:value pair is allways unreachable

echo dummy=%dummy%
echo dbpath=%dbpath%
echo dbname=%dbname%

output:

dummy=
dbpath=c:\tmp
dbname=hidra