When using CSL-JSON, the input format needs to be specified explicitly:
```
$ pandoc -f csljson mybib.json -s -o formatted-bibliography.html
```

It won't work without the `-f csljson`.  It will still work without that 
flag when the bibliography input format is CSL-YAML or BibLaTeX though, 
since the former is read as Markdown and the latter's format is guessed 
using its extension (.bib).

I hope that helps.

As a side note, perhaps including a more descriptive warning/error message 
might be helpful.  For .y{a}ml input files, the warning says:

[WARNING] Could not deduce format from file extension .y{a}ml
  Defaulting to markdown

Regards,
Pranesh

On Saturday, 21 November, 2020 at 5:52:30 am UTC+5:30 John MacFarlane wrote:

> "jmuc...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" <jmuc...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > This isn't working for me with json input (from Zotero). bib (also from 
> > Zotero) works just fine. I'm getting this error with the json:
> >
> > ```JSON parse error: Error in $: mempty``` 
> >
> > even with a json file with only one entry that json_verify is happy 
> with. 
> > The pandoc command is barfing on it. The old, nocite way works fine 
> still.
>
> Post it here; maybe it's a bug?
>
> > PS A side note: the new method with --citeproc generates html spans 
> every 
> > place the bib has double curly brackets to preserve cases in title. 
> Seems 
> > unnecessary.
>
> True, but also pretty harmless. We could get rid of them but
> there might be some performance penalty.
>

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