print JSON in a (Unix) shell script?
Is there a (Unix) shell script to format JSON in human-readable form?
Basically, I want it to transform the following:
{ "foo": "lorem", "bar": "ipsum" }
... into something like this:
{
"foo": "lorem",
"bar": "ipsum"
}
With Python 2.6+ you can just do:
echo '{"foo": "lorem", "bar": "ipsum"}' | python -m json.tool
or, if the JSON is in a file, you can do:
python -m json.tool my_json.json
if the JSON is from an internet source such as an API, you can use
curl http://my_url/ | python -m json.tool
For convenience in all of these cases you can make an alias:
alias prettyjson='python -m json.tool'
For even more convenience with a bit more typing to get it ready:
prettyjson_s() {
echo "$1" | python -m json.tool
}
prettyjson_f() {
python -m json.tool "$1"
}
prettyjson_w() {
curl "$1" | python -m json.tool
}
for all the above cases. You can put this in .bashrc and it will be available every time in shell. Invoke it like prettyjson_s '{"foo": "lorem", "bar": "ipsum"}' .
You can use: jq
It's very simple to use and it works great! It can handle very large JSON structures, including streams. You can find their tutorials here.
Here is an example:
$ jq . <<< '{ "foo": "lorem", "bar": "ipsum" }'
{
"bar": "ipsum",
"foo": "lorem"
}
Or in other words:
$ echo '{ "foo": "lorem", "bar": "ipsum" }' | jq .
{
"bar": "ipsum",
"foo": "lorem"
}
I use the "space" argument of [JSON.stringify ]1 to pretty-print JSON in JavaScript.
Examples:
// Indent with 4 spaces
JSON.stringify({"foo":"lorem","bar":"ipsum"}, null, 4);
// Indent with tabs
JSON.stringify({"foo":"lorem","bar":"ipsum"}, null, 't');
From the Unix command-line with nodejs, specifying json on the command line:
$ node -e "console.log(JSON.stringify(JSON.parse(process.argv[1]), null, 't'));"
'{"foo":"lorem","bar":"ipsum"}'
Returns:
{
"foo": "lorem",
"bar": "ipsum"
}
From the Unix command-line with Node.js, specifying a filename that contains JSON, and using an indent of four spaces:
$ node -e "console.log(JSON.stringify(JSON.parse(require('fs')
.readFileSync(process.argv[1])), null, 4));" filename.json
Using a pipe:
echo '{"foo": "lorem", "bar": "ipsum"}' | node -e
"
s=process.openStdin();
d=[];
s.on('data',function(c){
d.push(c);
});
s.on('end',function(){
console.log(JSON.stringify(JSON.parse(d.join('')),null,2));
});
"
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