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Aeson (JSON) FromConfig

Aeson FromConfig

This FromConfig instance provides support for parsing values of type Data.Aeson.Value.

This instance does not traverse keys at all, it only reads a the very same key and tries to parse it as JSON.

Examples

With the config

some.json=[1,2,3]

fetchFromConfig @Aeson.Value "some.json" config results in: [1,2,3].

---

With the config

some.json.0=1
some.json.1=2
some.json.2=3

fetchFromConfig @Aeson.Value "some.json" config results in a missing key error.

---

With the config

some.json=something

fetchFromConfig @Aeson.Value "some.json" config results in a failed parse error since something is not valid json (the quotes must be present).

Some sources are treat quotes in different ways so for example:

• APP_SOME_JSON=\"something\" for env vars
• --some.json=\"something\" for cli args
• {"some": {"json": "\"something\""}} for json source
• some.key="something" for properties source