Logrus: how can I set the field order when use jsonformat

Created on 15 Nov 2017 · 4Comments · Source: sirupsen/logrus

I want set the “time” to the first key。

{"level":"info","msg":"","time":"2017-11-11T14:38:52-05:00"}

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zhangdaoling

Most helpful comment

And another obstacle: the json marshaler outputs the keys of maps in alphabetical order:

Map values encode as JSON objects. The map's key type must either be a string, an integer type, or implement encoding.TextMarshaler. The map keys are sorted and used as JSON object keys by applying the following rules, subject to the UTF-8 coercion described for string values above:

string keys are used directly

encoding.TextMarshalers are marshaled

integer keys are converted to strings

Struct fields are marshalled in declaration order.

pasztorpisti on 19 Nov 2017

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As far as I can tell this is not supported my default because the Field type is a map and map iteration in go is random. If you really need it you can create a custom formater using an array of string to set the order.

brandonryan on 19 Nov 2017

And another obstacle: the json marshaler outputs the keys of maps in alphabetical order:

Map values encode as JSON objects. The map's key type must either be a string, an integer type, or implement encoding.TextMarshaler. The map keys are sorted and used as JSON object keys by applying the following rules, subject to the UTF-8 coercion described for string values above:

string keys are used directly

encoding.TextMarshalers are marshaled

integer keys are converted to strings

Struct fields are marshalled in declaration order.

pasztorpisti on 19 Nov 2017

👍3

@zhangdaoling basically you cannot. The JSONFormatter implementation is based in the encoding/json package from the standard library. This package does not provide any control on the order of json dictionnary key.