Biblatex bibliography – how to output DOI/URL differently based on digital copy/to-be printed copy

Question

What is the best practice using biblatex and hyperref packages to tweak the bibliography so that when the URL/DOI/ISBN "IDs" are present, they are shown as links with the placeholder "URL/DOI/ISBN" respectively, for instance? Is there some already available properties?

I would also like to switch to hard-copy to-be-printed too, so that this feature is turned off and the above information is printed fully.

Answer 1

The output of fields in biblatex is controlled via field formats.

The standard format for doi is (ll. 495-499 in biblatex.def (v3.16))

\DeclareFieldFormat{doi}{%
  \mkbibacro{DOI}\addcolon\space
  \ifhyperref
    {\href{https://doi.org/#1}{\nolinkurl{#1}}}
    {\nolinkurl{#1}}}

that for URL (l. 582 in biblatex.def (v3.16))

\DeclareFieldFormat{url}{\mkbibacro{URL}\addcolon\space\url{#1}}

you can easily change these formats so that they only print a "DOI" or "URL" and link that with \href{<link target>}{<text>} (note that you then need to load hyperref).

\documentclass[british]{article}
\usepackage[T1]{fontenc}
\usepackage{babel}
\usepackage{csquotes}

\usepackage[backend=biber, style=authoryear]{biblatex}
\usepackage{hyperref}

\DeclareFieldFormat{doi}{%
  \href{https://doi.org/#1}{\mkbibacro{DOI}}}

\DeclareFieldFormat{url}{%
  \href{#1}{\mkbibacro{URL}}}

\addbibresource{biblatex-examples.bib}

\begin{document}
Lorem \autocite{sigfridsson,ctan}

\printbibliography
\end{document}