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Streaming JSON filtering on the command line. Supports JSON querying and expression based filtering.
Works great for JSON datasets that are too big to JSON.parse() or for situations where you want to start reading data immediately.
Powered by JSONStream which is powered by jsonparse
Pipe JSON data to stdin!
jsonfilter <selector> [--match="filter expression"]
filter
is a string to 'query' your JSON with.
Matches will be printed as Newline Delimited JSON (NDJSON)
some examples:
Emit the value of a particular key by naming it, e.g. "name"
matches the key name
in an object and returns the value:
$ echo '{"name": "Joe Blogs", "age": 28}' | jsonfilter "name"
"Joe Blogs"
rows.*
matches any child elements of rows
, e.g.:
$ echo '{"name": "foo", "type": "bar"}{"name": "foobar", "type": "barfoo"}' | jsonfilter "name"
"foo"
"foobar"
"rows.*"
matches any child elements (items inside the array) of rows
, e.g.:
$ echo '{"rows": [ {"this object": "will be matched"}, {"so will": "this one"} ]}' | jsonfilter "rows.*"
{"this object": "will be matched"}
{"so will": "this one"}
"rows.*.doc"
matches all children of rows
with key doc
, e.g.:
$ echo '{"rows": [ {"doc": {"this object": "will be matched"}, "foo": "bar"} ]}' | jsonfilter "rows.*.doc"
{'this object': 'will be matched'}
"rows..doc"
recursively matches all children of rows
and emits all with key doc
, e.g.:
$ echo '{"rows": [ {"foo": {"bar": {"baz": {"taco": {"doc": "woo"}}}}} ]}' | jsonfilter "rows..doc"
"woo"
by default all matched objects are emitted. You can supply a custom JS expression to filter out matching objects with the --match
option.
$ echo '{"name": "foo", "type": "bar"}{"name": "foobar", "type": "barfoo"}' | jsonfilter "name" --match="this === 'foo'"
"foo"
$ echo '{"name": "foo", "type": "bar"}{"name": "foobar", "type": "barfoo"}' | jsonfilter --match="this.name === 'foo'"
{"name": "foo", "type": "bar"}
$ echo '{"name": "foo", "type": "bar"}{"name": "foobar", "type": "barfoo"}' | jsonfilter --match="this.name.indexOf('foo') > -1"
{"name": "foo", "type": "bar"}
{"name": "foobar", "type": "barfoo"}
FAQs
Streaming JSON filtering on the command line
The npm package jsonfilter receives a total of 28,048 weekly downloads. As such, jsonfilter popularity was classified as popular.
We found that jsonfilter demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 4 open source maintainers collaborating on the project.
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