condense-json 1.0: One Library, Eighteen Months, Zero Drama
condense-json 1.0 is a Python library that compresses deeply nested JSON into a shorter, still-readable form for pasting into LLM prompts or logs.
What it is
condense-json is a small Python library by Simon Willison for collapsing verbose, deeply nested JSON structures into a more compact representation, first released about a year and a half ago and now stable at 1.0.
What it does
It takes a JSON document and produces a condensed form that preserves structure and meaning while cutting the token count, useful before pasting API responses or logs into a prompt or a terminal. The 1.0 release applies sensible, non-disruptive fixes rather than a rewrite.
Why it matters
Instead of manually truncating or reformatting bulky JSON before feeding it to an LLM, this gives you a drop-in way to shrink it without losing the shape of the data, which matters when every extra token costs money and context window space.
How to use it
Install it as a Python dependency (via pip or uv) and call its condense function on any JSON-serializable object or string before logging it or including it in a prompt.
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