A good bug report is one of the most valuable contributions you can make to an open source project, and it does not require writing a single line of code. A bad report, by contrast, eats up maintainers' time in questions and fruitless attempts, and often ends up closed without a fix. The difference almost always comes down to a few pieces of information in the right place.
Before opening the issue
Three checks avoid most useless reports:
- Update to the latest version and check whether the problem still exists. Many bugs have already been fixed.
- Search the existing issues, including closed ones, using the exact error message as a keyword.
- Rule out your configuration: try with default settings, without plugins or extensions, in a clean environment.
If you find an identical open issue, add your information only if it is new (a different version, a different operating system, a simpler way to reproduce it). A comment that just says «me too» does not help; use the reaction the platform provides instead.
The structure of an effective report
Many projects provide a template. If there is none, this structure works almost everywhere:
- specific title: «CSV export loses accented characters with semicolon separator» rather than «Export does not work»;
- environment: software version, operating system, runtime or browser version, installation method;
- steps to reproduce: a numbered list, from the starting point to the problem;
- expected behaviour: what should happen;
- observed behaviour: what actually happens, with the error message copied as text;
- additional information: relevant logs, how often it happens, which version it first appeared in if you know.
The minimal reproduction
The single element that speeds up a fix the most is a minimal example that reproduces the problem. Minimal means that if you remove any part, the bug disappears.
For a library, it is a short standalone program:
from library import export_csv
rows = [{"name": "Niccolò", "city": "Forlì"}]
export_csv(rows, "out.csv", separator=";")
print(open("out.csv", encoding="utf-8").read())
# expected: name;city / Niccolò;Forlì
# got: name;city / Niccol?;Forl?
For an application, it is a sequence of actions starting from a fresh install, possibly with a sample file attached. Narrowing down the case takes time, but it often also leads you to the cause, or to realise the problem was somewhere else.
Logs and error messages
A few practical rules:
- paste errors as text in a code block, not as screenshots: text can be searched and copied;
- include the full stack trace, not just the last line;
- if the log is long, attach a file or include only the part around the error, saying it is an excerpt;
- remove sensitive data: tokens, passwords, internal addresses, customer names, paths that reveal personal information.
The last point matters: issues are public and stay indexed. An API key pasted by mistake must be considered compromised and revoked immediately, even if you edit the comment.
What not to do
| Behaviour | Why it hurts |
|---|---|
| Reporting several problems in one issue | It cannot be closed when only one is fixed |
| Using issues for usage questions | They clog the tracker; forums or dedicated channels exist |
| Writing «urgent» or demanding deadlines | Maintainers have no obligations towards you |
| Reporting vulnerabilities in public | It exposes users before a fix exists |
| Disappearing after reporting | Clarifying questions go unanswered |
Security vulnerabilities deserve a separate channel: look for a SECURITY.md file or a dedicated address and follow the procedure described there.
After reporting
Stay reachable. Maintainers may ask you to try a development build, a different option or to provide a missing detail. Replying within a few days keeps the issue alive; many projects automatically close issues waiting for feedback after a certain period.
If a fix arrives, confirm that it also works in your real-world case. It is a small gesture that closes the loop and helps whoever runs into the same problem.
In my work I have noticed that a well-written report is often resolved quickly precisely because the maintainer can reproduce it in a few minutes, without any back-and-forth.
In short
- Update, search existing issues and rule out your own configuration before reporting.
- Provide environment, steps, expected and observed behaviour with a specific title.
- A minimal reproduction is the contribution that speeds up a fix the most.
- Paste errors as text and always remove sensitive data.
- Report vulnerabilities only through the private channel the project specifies.
