Byebug

Health v2 · maintenance only

Adoption not part of the score

3349 stars · 329 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Byebug is a feature-rich debugger for Ruby implemented as a C extension using the TracePoint and Debug Inspector APIs. It provides stepping, breakpoints, REPL evaluation, and variable tracking, both from within code and from the command line.

Use cases

• debug a ruby script from the command line
• set a breakpoint inside a rails controller
• step through ruby code line by line
• inspect variable values while a ruby program runs
• add a repl debugger to ruby tests
• pause execution when an exception is raised

When to choose

• you need a reliable, fast native debugger for MRI Ruby 3.3+
• you want classic gdb-style commands like break, step, and backtrace in Ruby
• you debug Rails apps and want to drop a breakpoint into controllers or models
• you want pry integration via pry-byebug for a better REPL

When to avoid

• you need to debug JRuby or TruffleRuby, since byebug requires MRI
• you only want a standalone REPL without execution control, where plain pry suffices
• you need a graphical debugger UI rather than a command-line interface
• you are on Ruby older than 3.3.0

Facets

library · maturity active

testing developer-tools cli developer-tools programming-languages ruby cli cross-platform debugger ruby-debugger repl tracepoint breakpoints stepping pry-byebug command-line

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