Caution
Grafana Agent has reached End-of-Life (EOL) on November 1, 2025. Agent is no longer receiving vendor support and will no longer receive security or bug fixes. Current users of Agent Static mode, Agent Flow mode, and Agent Operator should proceed with migrating to Grafana Alloy. If you have already migrated to Alloy, no further action is required. Read more about why we recommend migrating to Grafana Alloy.
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!"
