Command line utility that displays the approximate space requirements of a JSON representation of JavaScript data, summarized at arbitrary depth levels (default 1).
$ npm install -g jsonsize
This example queries the reddit API, and passes the JSON response to jsonsize:
$ curl -s http://www.reddit.com/r/pics.json | jsonsize
{
"kind": "string: 9 B",
"data": "object: 27.8 KB",
"TOTAL": "27.8 KB"
}
We can see that the total size is around 27.8 KB. There are 2 top-level entries, "kind" and "data". The "kind" value takes up 9 Bytes, while the "data" value takes up almost all the space.
You can play with the -d (also --depth) parameter to get size summaries on various depth levels:
$ curl -s http://www.reddit.com/r/pics.json | jsonsize -d 2
{
"kind": "string: 9 B",
"data": {
"modhash": "string: 2 B",
"children": "object: 27.9 KB",
"after": "string: 11 B",
"before": "object: 4 B",
"TOTAL": "28 KB"
},
"TOTAL": "28 KB"
}
This shows us the next level of entries below "data". Let's look at d 3, which gives us some more insight into
the "children" array:
$ curl -s http://www.reddit.com/r/pics.json | jsonsize -d 2
{
"kind": "string: 9 B",
"data": {
"modhash": "string: 2 B",
"children": [
"object: 986 B",
"object: 1.02 KB",
"object: 1.07 KB",
"object: 1.04 KB",
"object: 1.19 KB",
"object: 1.13 KB",
"object: 1.05 KB",
"object: 1.1 KB",
"object: 1.1 KB",
"object: 903 B",
"object: 1.02 KB",
"object: 1.05 KB",
"object: 1.14 KB",
"object: 1.04 KB",
"object: 1.04 KB",
"object: 1.03 KB",
"object: 1.12 KB",
"object: 2.29 KB",
"object: 1.17 KB",
"object: 1.03 KB",
"object: 1.2 KB",
"object: 1.03 KB",
"object: 963 B",
"object: 1.05 KB",
"object: 1.06 KB",
"TOTAL: 27.9 KB"
],
"after": "string: 11 B",
"before": {
"TOTAL": "2 B"
},
"TOTAL": "27.9 KB"
},
"TOTAL": "27.9 KB"
}
jsonsize assumes that strings are encoded in RFC4627-compliant fashion, meaning that <, >, ", ', and & are replaced by their unicode escape sequences (e.g., \u003C for <).
jsonsize is distributed under the MIT License.