condense-json 1.1

Simon Willison released condense-json 1.1, adding support for non-string replacement values and object-based merge operations to the JSON compression tool. The update also includes round-trip tests using the Hypothesis property-based testing library.

Release: condense-json 1.1 https://github.com/simonw/condense-json/releases/tag/1.1 After shipping condense-json 1.0 https://simonwillison.net/2026/Aug/2/condense-json/ 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 https://github.com/simonw/condense-json/blob/1.1/tests/test properties.py using the Hypothesis https://hypothesis.readthedocs.io/ property-based Python testing library. Tags: json https://simonwillison.net/tags/json