json-log-viewer

Powerful terminal based viewer for JSON logs using ncurses.

json-log-viewer is a feature intensive viewer and analyze tool for JSON logs created by libraries like https://github.com/winstonjs/winston.

Features:

completely operated by hotkeys
powerful command line arguments
sort by timestamp, level or message
filter by any field or metadata
search

Hotkeys:

arrows and page up/down to move
/ to search
n to search again
s to sort
f to filter
l to filter by level
g to go to line
0 to go to first line
$ to go to last line
q to quit

Install

npm install --global json-log-viewer

Usage

jv application.log.2017-01-01 --sort -timestamp

Configuration

The default expected log format include fields timestamp, level and message. If the log file you're trying to parse doesn't include those fields, you can create a config file on your HOME path called .json-log-viewer.

For example, if your log lines look like this:

{
  "message":
    "Matched route \"**_heartbeat_check\" (parameters: \"_controller\": \"**\\Controller\\**Controller::heartbeatCheckAction\", \"_route\": \"**_heartbeat_check\")",
  "context": [],
  "level": 200,
  "level_name": "INFO",
  "channel": "request",
  "datetime": {
    "date": "2017-12-06 09:23:42.253060",
    "timezone_type": 3,
    "timezone": "Europe/Berlin"
  },
  "extra": []
}

You can create a mapping configuration like this:

[transform]
level=level_name
timestamp=datetime.date
message=message
extra=$

This way the messages will properly be displayed. The $ has a special meaning: it tells the the old object should be included on the extra key on the resulting JSON. The result will look like this:

Screenshots

Details view

Filters

Log level selection

License