Writes data as a JSON object, and includes field values optionally. The
specified fields will be formatted as JSON and assigned to the field
specified in as
, defaults to
_json.
Parameter | Type | Required | Default | Description |
---|---|---|---|---|
as | string | optional[a] | _json | Name of output field. |
field [b] | Array of strings | optional[a] | @rawstring | Values and fields that should be converted to JSON. Accepts either a value or array of values. Values are interpreted as prefix matches, unless a globbing pattern with * is given (see example below.) |
[a] Optional parameters use their default value unless explicitly set. |
Hide omitted argument names for this function
Omitted Argument NamesThe argument name for
field
can be omitted; the following forms of this function are equivalent:logscalewriteJson("field")
and:
logscalewriteJson(field="field")
These examples show basic structure only.
writeJson()
Examples
Multiple fields can be included. Given events where:
jsona.b.c=5, a.b.e[0]=6, a.d=7, a.f.g=8
use the query function to call:
logscalewriteJson(["a.b.c", "a.b.e[0]", "a.d", "a.f.g"])
It will write the following JSON to each event, respectively:
json{"a":{"b":{"c":5}}}, {"a":{"b":{"e":[6]}}}, {"a":{"d":7}}, {"a":{"f":{"g":8}}}
Arguments passed to the field parameter are interpreted as prefix matches. For example, the query:
logscalewriteJson(field=["a.b"])
matches:
jsona.b.c a.bc a.b[0] a.b! …
Array-glob patterns can be passed to the field parameter. For example, the query:
logscalewriteJson(field=["a.b[*]"])
matches all fields in the event and it also matches anything else that starts with a:
jsona.b[0] a.b[0]c a.b[0].c a.b[0][0] a.b[0]! ... a.b[1]c a.b[1].c a.b[1][0] a.b[1]! …