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We Rewrote JSONata with AI in a Day, Saved $500K/Year

We Rewrote JSONata with AI in a Day, Saved $500K/Year | Reco

reco.ai

March 26, 2026

8 min read

Summary

Reco utilized AI to rewrite JSONata in one day, resulting in a cost savings of $500,000 per year. The process involved using an existing specification and test suite to guide the AI in implementing the code until all tests passed.

Key Takeaways

  • Reco developed gnata, a pure-Go implementation of JSONata 2.x, in seven hours using AI, resulting in a $500K annual cost savings.
  • The previous JSONata implementation in JavaScript incurred approximately $300K per year in compute costs due to RPC overhead.
  • The new gnata implementation eliminates the need for RPC calls, reducing latency and improving performance for evaluating JSON expressions.
  • The project involved porting the official JSONata test suite to Go and achieving 1,778 passing test cases with a total token cost of $400.

Community Sentiment

Mixed

Positives

  • The use of AI to rewrite JSONata in Go significantly reduced operational costs, saving approximately $500K annually, which highlights the potential for AI to optimize software development.
  • Transitioning from a JavaScript-based architecture to Go not only improved performance but also streamlined the deployment process, indicating a successful application of AI in enhancing system efficiency.

Concerns

  • Concerns arise about the long-term maintenance of the AI-translated code, especially given the existing open issues and pull requests, which could impact its reliability and sustainability.
  • The high operational costs of $300K per year for running JSONata in a Node.js environment raise questions about the efficiency of their previous architecture and whether AI was truly necessary for the rewrite.
Read original article

Source

reco.ai

Published

March 26, 2026

Reading Time

8 minutes

Relevance Score

61/100

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