How to No-index Category path URL?

Question

Can anyone tell me how to No-index Category path URL from Google in Question2answers Script.

Like that-

https://website.com/category

Answer 1

Suggest use robot.txt todo this

Comments

I tried, but it's not working.

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if it has been indexed by google，you should ask google to delete first.
the robot.txt is only to tell the SE which should be craw, it not tell SE delete the indexed page

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Hi Sir...
Is any other method (by code editing) except robots.txt file editing for to do this.

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NO
The indexed page is not under the control of the QA site code

Answer 2

i think that cant be undone on google as zhao said, unless you request manual removal.

for the future you can type on the table in the database a value that dont exist as parent id of category. that leads for the category not appears listed on the site.