json-merge
Version:
given two streams of newline delimited JSON data perform a merge/extend on each object in the stream
122 lines (86 loc) • 1.83 kB
Markdown
# json-merge
given multiple streams of newline delimited JSON data perform a merge/extend on each object in the stream
[](https://nodei.co/npm/json-merge/)
## usage
```
npm install json-merge -g
Usage: json-merge <source1> [options] <source2> [options] [<source3>...]
Options
--parse=<s> Parse the precedent source with <s>
```
sources can be one of 3 things:
- paths to newline-delimited json data files
- HTTP uris that return newline-delimited json data
- JSONStream selector syntax to be used to parse stdin into a stream of JS objects
## examples
### newline delimited json files
e.g. given a file `a.json`:
```
{"foo": "bar"}
```
and a file `b.json`:
```
{"taco": "pizza"}
```
then running:
```
json-merge a.json b.json
```
would output:
```
{"foo": "bar", "taco": "pizza"}
```
### JSONStream parsing
you can also specify [JSONStream](http://npmjs.org/JSONStream) query syntax and `json-merge` will parse stdin
e.g. if `foobar.json` is:
```
{
"data": [
{
"a": {
"all": "lowercase"
},
"b": {
"ALL": "CAPS"
}
}
]
}
```
then running:
```
cat foobar.json | json-merge "data.*.a" "data.*.b"
```
would output:
```
{"all":"lowercase","ALL":"CAPS"}
```
### Parsing different sources
A given a file `food1.json`:
```
{
"salty":
{
"tacos": "muybien",
"pretzel": "jawohl"
}
}
```
and a file `food2.json`:
```
{
"sweet":
{
"waffle": "delicious",
"pancake": "yummy"
}
}
```
then running:
```
json-merge food1.json --parse="salty" food2.json --parse="sweet"
```
would output:
```
{"tacos":"muybien","pretzel":"jawohl","waffle":"delicious","pancake":"yummy"}