Biblatex: Get rid of ISSN, URLs and DOIs in references

Assuming you are using standard styles, use biblatex package options doi=false,isbn=false,url=false,eprint=false. For example,

\usepackage[doi=false,isbn=false,url=false,eprint=false]{biblatex}

The manual describes these as 'style-specific' options, as they do depend on the bibliography style in use.

Alternatively, if you want biblatex not to see these fields at all, use Biber and see section 4.5.3 of the biblatex manual. You are now able to filter out arbitrary fields (and map them to other fields) before biblatex even sees the data with so-called source maps.

\documentclass[british]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{babel}
\usepackage{csquotes}

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

\DeclareSourcemap{
  \maps[datatype=bibtex]{
    \map{
      \step[fieldset=issn, null]
    }
  }
}

\addbibresource{biblatex-examples.bib}

\begin{document}
\cite{sarfraz}
\printbibliography
\end{document}