In the general case, there is not enough information in a diff file (in isolation) to be able to give such context - because in the general case there is no guarantee that unchanged entries such as the id will appear in the context lines. Because of that there is unlikely to be a general-purpose module available for this.

In your specific case, maybe it is possible - if the JSON is guaranteed to be short enough that the id and timestamp will always appear in the context lines. In that case, a hand-rolled parser for the diff chunks should be easy to construct and use; you may be able to get a leg-up by finding something that already parses diff files (such as the inline "Patch" class in patch, part of PerlPowerTools), but it may well be overkill for your needs.

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.