jpro
jpro is a JSON processor that can be written in a JavaScript code piece.
Demo
You can immediately run the following command, if you have node.js installed
$ echo '{"name":"bob","like":["sushi","orange"]}' | npx jpro '.like'
[
"sushi",
"orange"
]
Or you can install it and run it without npx. This will be faster to execute.
# Install jpro to your computer
npm install -g jpro
# Run
$ echo '{"name":"bob","like":["sushi","orange"]}' | npx jpro '.like'
[
"sushi",
"orange"
]
Usage
jpro is a JSON processor that can be written in a JavaScript code piece. The command line argument code piece is interpreted as follows.
eval("output = input " + <A CODE PIECE WITH COMMAND LINE ARGUMENT>)
The following variables are available in the code piece.
- input ... JavaScript object input as JSON from STDIN
- output ... JavaScript object output as JSON to STDOUT
- stdin ... String input from STDIN
- stdout ... String output to STDOUT (Preferred over output, if not null or undefined)
Examples
Examples of execution is shown below.
$ echo '{"name":"bob","like":["sushi","orange"]}' | npx jpro '.like'
[
"sushi",
"orange"
]
$ echo '{"name":"bob","like":["sushi","orange"]}' | npx jpro '&& Object.keys(input)'
[
"name",
"like"
]
$ echo '{"name":"bob","like":["sushi","orange"]}' | npx jpro '; stdout = input.like.join("&")'
sushi&orange
$ echo 'hello, world' | npx jpro ';stdout = stdin.toUpperCase()'
Warning: failed to parse JSON from STDIN
HELLO, WORLD
$ echo 'hello, world' | JPRO_SILENT=true npx jpro ';stdout = stdin.toUpperCase()'
HELLO, WORLD