condense-json 1.1
<p><strong>Release:</strong> <a href="https://github.com/simonw/condense-json/releases/tag/1.1">condense-json 1.1</a></p> <p>After shipping <a href="https://simonwillison.net/2026/Aug/2/condense-json/">condense-json 1.0</a> I started integrating it into LLM, and found there were some desirable new features already:</p> <blockquote> <ul> <li>Replacements object can now include values other than strings. These will be identified and used as structural replacements by <code>condense_json()</code> and <code>uncondense_json()</code>. <a href="https://github.com/simonw/condense-json/pull/8">#8</a></li> <li>Objects can be used as the basis for merge operations. <code>condense_json()</code> will identify if there are objects that are a close match and will store instructions for keys to update or delete. <code>uncondense_json()</code> can then apply these merges.</li> </ul> </blockquote> <p>I also added <a href="https://github.com/simonw/condense-json/blob/1.1/tests/test_properties.py">some round-trip tests</a> using the <a href="https://hypothesis.readthedocs.io/">Hypothesis</a> property-based Python testing library.</p> <p>Tags: <a href="https://simonwillison.net/tags/json">json</a></p>
Release: condense-json 1.1
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3rd August 2026
Release
condense-json 1.1 — Python function for condensing JSON using replacement strings
After shipping condense-json 1.0 I started integrating it into LLM, and found there were some desirable new features already:
Replacements object can now include values other than strings. These will be identified and used as structural replacements by condense_json() and uncondense_json(). #8
Objects can be used as the basis for merge operations. condense_json() will identify if there are objects that are a close match and will store instructions for keys to update or delete. uncondense_json() can then apply these merges.
I also added some round-trip tests using the Hypothesis property-based Python testing library.
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