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Documentation Grafana Alloy Reference Standard library json_decode

json_decode

The json_decode function decodes a string representing JSON into an Alloy value. json_decode fails if the string argument provided can’t be parsed as JSON.

A common use case of json_decode is to decode the output of a local.file component to an Alloy 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

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> 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!"