Caution
Grafana Alloy is the new name for our distribution of the OTel collector. Grafana Agent has been deprecated and is in Long-Term Support (LTS) through October 31, 2025. Grafana Agent will reach an End-of-Life (EOL) on November 1, 2025. Read more about why we recommend migrating to Grafana Alloy.
This is documentation for the next version of Agent. For the latest stable release, go to the latest version.
json_decode
The json_decode
function decodes a string representing JSON into a River
value. json_decode
fails if the string argument provided cannot be parsed as
JSON.
A common use case of json_decode
is to decode the output of a
local.file
component to a River value.
Remember to escape double quotes when passing JSON string literals to
json_decode
.For example, the JSON value
{"key": "value"}
is properly represented by the string"{\"key\": \"value\"}"
.
Examples
> json_decode("15")
15
> json_decode("[1, 2, 3]")
[1, 2, 3]
> json_decode("null")
null
> json_decode("{\"key\": \"value\"}")
{
key = "value",
}
> json_decode(local.file.some_file.content)
"Hello, world!"