fblog

Small command-line JSON log viewer

Runs as fblog|macOS, Linux, Windows|github.com

Command form

ai-draft · 2 tasks · 10 fields

Pretty-print JSON log lines from a file or stdin with optional Lua filter and extra fields. Output templates and level mapping are left out.

Opens the form; the finished command lands at your prompt, unrun

Run in Otty

otty gui fblog

View JSON logsExample values, fixed in this page — nothing here reaches a terminal

Basic

Log file*

file

TasksEach one presets the form for one job

View a log file

input

Filter entries

inputfilter

ParametersOnly these flags are editable in the form

Log file

Leave empty to read stdin.
path · positional 0

Lua filter

string

--filter-f

Dump all values

boolean

--dump-all-d

Additional values

string · repeatable

--additional-value-a

Excluded values

string · repeatable

--excluded-value-x

Lines have a text prefix

boolean

--with-prefix-p

Extra message key

string · repeatable

--message-key-m

Extra time key

string · repeatable

--time-key-t

Extra level key

string · repeatable

--level-key-l

No implicit return in filter

boolean

--no-implicit-filter-return-statement

SourcesEvery flag above is checked against these

help

-a, --additional-value <additional-value> adds additional values -x, --excluded-value <excluded-value> Excludes values (--dump-all is enabled implicitly) -d, --dump-all dumps all values -p, --with-prefix consider all text before opening curly brace as prefix -f, --filter <filter> lua expression to filter log entries. `message ~= nil and string…

helpmaster 2026-10-27

github.com

Before it fills your prompt, Otty checks the installed fblog against its version. A form that does not match your version is not offered.