Question 1

How do I filter logs by error level in fblog?

Accepted Answer

Use the -f flag with a Lua expression, e.g., 'fblog -f "level == 'error'" logfile.json'. You can also map custom levels in the TOML config file for non-standard values.

Question 2

fblog vs jq: which is better for viewing JSON logs?

Accepted Answer

fblog is optimized for log viewing with built-in colorization, filtering, and formatting, while jq is a general-purpose JSON processor. fblog simplifies log-specific tasks, but jq offers more flexibility for complex JSON transformations.

Question 3

Can fblog handle real-time log streaming?

Accepted Answer

fblog doesn't support native tailing; you must pipe from a tail command, e.g., 'tail -f logfile | fblog'. This works effectively but adds an extra step to the workflow.

Question 4

How to customize the output colors in fblog?

Accepted Answer

Use the --main-line-format option with color helpers like {{ red message }} or level_style in Handlebars templates. Colors can be disabled globally with the NO_COLOR environment variable.

Question 5

What log formats does fblog support?

Accepted Answer

fblog only supports JSON log entries. It can parse prefixed logs (e.g., from kubectl) with the -p flag, but the core data must be in JSON format, limiting compatibility with other log types.

Question 6

How to install fblog on macOS without Cargo?

Accepted Answer

Install via Homebrew with 'brew install fblog', as listed in the README. Pre-built packages are available, avoiding the need to compile from source using Cargo.

fblog

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