Help with simple JSON format

[vdawg-git]

I have basic in a NodeJs/Bun app with Winston.

The logs have a level, timestamp, message and arbitrary keys.

{"level":"info","message":"Starting app..","timestamp":1737471791303}
{"level":"debug","message":"COMMAND loadfile\n","requestId":8460,"timestamp":1737471792371}
{"0":"{\"data\":{\"playlist_entry_id\":1}","level":"debug","message":"Command: loadfile","timestamp":1737471792372}

I tried it with a schema like this, however it just doesnt get applied.

{
	"$schema": "https://lnav.org/schemas/format-v1.schema.json",
	"moo_log": {
		"title": "Moo Json log",
		"description": "",
		"url": "",
		"file-type": "json",
		"level-field": "level",
		"timestamp-field": "timestamp",
		"body-field": "message",
		"line-format": [
			{
				"field": "createdAt"
			},
			{
				"prefix": " ",
				"field": "level"
			},
			{ "field": "message" }
		],
		"value": {
			"message": { "kind": "string" },
			"createdAt": { "kind": "integer" },
			"level": { "kind": "string" }
		},

		"sample": [
			{
				"line": "{\"timestamp\":1737407223914,\"level\":\"debug\",\"message\":\"mpv data\"}",
				"level": "debug"
			},
			{
				"line": "{\"timestamp\":1737407223914,\"level\":\"xx\",\"message\":\"mpv data\"}",
				"level": "debug"
			}
		]
	}
}

What am I doing wrong?

Also #454 would be so nice to get feedback on the process

[tstack]

It's working for me on lnav v0.12.3:

I copied your format file and ran lnav -i to install it.

What version of lnav are you using?

You can run lnav with -d /tmp/lnav.dbg to have lnav write a debug log. There's some more details about what is going on there. In the "Files" panel in the TUI, you can press CTRL-] to focus on the details view to get some other details.

Some notes on the format:

• You'll want to set timestamp-divisor to 1000 since it looks like the timestamp value is milliseconds since the epoch.
• The sample lines are only used for plain text logs that use regexes.
• There's no createdAt field in the sample logs, but it's mentioned in the format.

[vdawg-git]

I got it working. Thank you for your help!
Also this is by far the best log viewer out there, so also thank you for creating it :)