27th March 2026 - Link Blog
We Rewrote JSONata with AI in a Day, Saved $500K/Year. Bit of a hyperbolic framing but this looks like another case study of vibe porting, this time spinning up a new custom Go implementation of the JSONata JSON expression language - similar in focus to jq, and heavily associated with the Node-RED platform.
As with other vibe-porting projects the key enabling factor was JSONata's existing test suite, which helped build the first working Go version in 7 hours and $400 of token spend.
The Reco team then used a shadow deployment for a week to run the new and old versions in parallel to confirm the new implementation exactly matched the behavior of the old one.
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This is a link post by Simon Willison, posted on 27th March 2026.
go 51 json 146 ai 1934 generative-ai 1715 llms 1681 agentic-engineering 34 vibe-porting 7Monthly briefing
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