Consider this situation:

There is this question on another site which I think would be a good candidate for migration to Code Review. What should I consider before flagging the question, or actually migrating it?


2 Answers 2


Checklist for migration to Code Review

  1. Is the question off-topic on the originating site?

    • Are you sure? Do not migrate if there is doubt.
  2. Is the question on-topic for Code Review?

    • The question must contain working code. Code Review is not a debugging service. Reviewers may discover bugs in the course of answering, but the code should be generally correct in the first place.
    • If the code is hosted externally, the code that lies at the heart of the question must still be written directly in the question itself.
    • Code excerpts are fine, but they must be recognizable as code that would appear in a real project. Hypothetical code (such as code that uses foo as an identifier), stub code (with unimplemented placeholders in places central to the question), or pseudocode (not in a real programming language) are not suitable for Code Review.
  3. Is the question calling for a code review?

    • The author of the question must be an author or maintainer of the code.
    • Requests to explain others' code are off-topic.
    • In Code Review, answers may cover any aspect of the code, including the algorithm, data structures, code organization, naming, and style. (The code in the question must be preserved as the author intended — including whitespace.)
  4. If there are answers already, they must be good answers on Code Review too.

    • Good Code Review answers explain how to improve the code.
    • Answers that just contain code with no explanation are not allowed.
    • If the answer proposes a completely different solution, there should also be a mention of why the approach is superior to the original code.
  5. Has the question already been asked on Code Review?

    • Please check for duplicate questions from the same author.
    • Questions with different code to perform the same task are not considered duplicates on Code Review.

If you are unsure whether a question is a good candidate for migration to Code Review, feel free to ask for an opinion in our chat room.


(the bulk of this answer is plagiarized borrowed from: What is migration and how does it work? - I have taken that and adapted it to focus on Code Review specific concerns)

Migrating to Code Review:

  1. Background
  2. General Constraints
  3. Technical Constraints
  4. Question Constraints
  5. Answer Constraints


Migration allows a question that is off-topic on one site in the Stack Exchange network to Code Review (where it will be on-topic) gracefully. It preserves the current revision of the question, all its answers, and any comments on any of those posts, as well as most of the votes.

What alternatives to Migration are there

Just because a question can be migrated, does not mean that it should. If in doubt, vote-to-close the question (it is off-topic), and add a comment suggesting the asker should read the on-topic help for Code Review, and that they may want to re-ask their question there.

This is a perfectly fine alternative to migration, and in many cases it is better.

Side Effects of Migration:

  • Down votes are cleared from the question upon its migration.

  • If a user who has participated in the question does not have an account on the target site, their username is displayed as plain-text until they create an account there.

  • Answers on the origin site are deleted immediately upon question migration (this causes a reversal of all associated reputation on the origin site).

  • The question is left as a stub, or pathway to the new site, for 30 days, after which it is automatically deleted (again, this causes a reversal of all associated reputation on the origin site).

Process for a 'bad' migration

A question can rejected by the target community after it has already been migrated if it gets closed as a reason other than duplicate, or gets deleted (usually by the owner) on the target site. When a question which was already migrated gets rejected, the entire process of the migration is reversed. All the answers are returned to the origin site and undeleted (unless the question was deleted on the source site) and are subsequently deleted on the target site.

General Constraints

Technical Constraints

Code Review is not in the migration list

Code Review has decided to not allow migrations from Stack Overflow (for now?). Therefore, users cannot migrate questions to Code Review just by voting; questions can only be migrated by a moderator of the original site.

The right way to start the migration process of a question to Code Review is to flag the question 'for Moderator Attention' and as part of the custom message, indicate:

This question is off-topic for Stack Overflow because it does not contain a specific question to be answered. However, it is on-topic for Code Review, since the code works, and the asker wants open-ended discussion. Please migrate to Code Review.

Older Questions

Only questions which are younger than 60 days can be migrated to other sites. This rule applies even to moderators on the site.

Question Constraints

Off-topic on source site

It goes without saying that there is no point in migrating a question that is on-topic where it is. This sounds silly, but it is possible for questions to be on-topic on multiple sites. Although a question would be great on Code Review, it may also be good-enough on its current site.

On-topic on Code Review

The question should be on-topic on Code Review. This should be obvious, but the standard for on-topicness should be even higher for migrated questions. It should be a 'reference quality' question. If there is any doubt about this, don't!

Duplicate on Code Review

Has the question already been asked here?

Answer Constraints

If the question already has answers on the source site, then migration is probably not a good solution:

Avoid migrating answered questions. The point of migration is to send the question to an on-topic place when it can get answered. If the OP already has an answer, then we've already defeated the purpose of migration and the destination site won't have anything to do with the question. Avoid migrating these questions unless they are of extremely good quality and risk deletion on the current site.

If there are answers, they would all need to be good answers on Code Review too.


You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .