A DOI ("Digital Object Identifier") is a unique identifier that can be assigned to a periodical article, book, report, or other content. DOIs are most commonly associated with journal articles. If you have a source that lists a DOI, NoodleTools provides a shortcut that allows you to import the information for that source and create a citation quickly. This is especially useful for journal articles, since those often have a long list of authors, which can take a long time to enter by hand!
In NoodleTools, if you find an article that has a DOI, click "+ New Source" on the Sources screen and select the appropriate form for the article. Depending on the publication medium and citation style, not every form has a DOI field, so this feature is not available if you don't see the DOI field on the selected form.
Copy the DOI from the article into the NoodleTools DOI field. Note that different citation styles want you to format the DOI in different ways (APA and Chicago wants the DOI formatted as a URL starting with "https://doi.org/" whereas MLA wants the DOI prepended with "doi:"). You can enter the DOI into the field in any of these ways and we'll format it correctly (although you may see a yellow informational message notifying you that the way you've entered it is different than how the style wants you to format it):
Never use a proxied version of a DOI, like the EZproxy one pictured below, which would be specific to the school or library where you are accessing it, and will not import successfully. In this case, just copy and paste the DOI number alone (10.1038/s41586-020-2189-9 in the example below).
After you copy a DOI into the DOI field on the form, a "Search" button appears. If you see a yellow suggestion, you can make the suggested change (but "Search" will find the source even if you don't make that change).
When you click "Search" and a matching article is located, the DOI import data will appear in a pop-up window.
Click "Import data" and NoodleTools will automatically fill your form with the source data. Save the new citation to add the reference to your source list.