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jev-json-builder

eortizs/jev-json-builder

Typed JSON from natural language via TypeSafe Jev, no generative LLM.

Automated README summary

Automatically summarized from the README on 27 Sept 2026; not a run by jevbooks. Run instructions and author-reported outcomes still need verification.

What it is

Express middleware that turns raw text into strictly-typed JSON payloads using TypeSafe Jev (System One). For developers who want typed NL→JSON without a generative LLM or MCP middleware.

How it uses Jev

Jev answers typed questions (Choice/Score/Noul) over the input text and schema-defined fields. Results are returned as calibrated probabilities, which JJB uses to select enum values, extract integers, and populate optional fields into a typed payload.

Primitives:choicescorenoul

Technique worth stealing

Schema DSL with per-field questions; Jev returns probabilities used to select values.

Try it

npm install && npm run demo, then open http://localhost:3000/playground

View on GitHub

Start using Jev: API key and your first request →

Model judgments from README excerpts

Project signals use repository metadata, an existing summary and the first 700 README characters, not the full project. “Not found” means not detected in that material; it does not establish absence. These are the original judgments with recorded models and dates, not source audits or run results.

Models & evaluation dates

Inclusion gate
jev-1.13.0
Project signals
jev-1.13.0
Category
jev-1.13.0
Pattern tags
jev-1.13.0

Evidence

These signals use repository metadata, an existing summary and at most 700 cleaned README characters. ≥ 0.60 means reported in that excerpt; ≤ 0.40 means not found there. The middle band is inconclusive. None is a source-code audit or a test result. The runnable-tool question excludes research experiments; the recommendation question asks for a learning shortlist, not a quality verdict.

  • Jev is core to the projectFound in material0.74
  • Shows a System One patternnot found in the excerpt0.11
  • Describes handling uncertaintynot found in the excerpt0.05
  • Reports measured numbersFound in material0.81
  • Is a runnable toolFound in material0.98
  • Top-10 learning shortlist signalunclear0.52
  • Is a replica of the modelnot found in the excerpt0.19
  • Solves a common problem (0–2)score on a 0–2 scale1.24 / 2
  • About JevFound in material0.97
Signals
Jev is core to the project0.74Shows a System One pattern0.11Describes handling uncertainty0.05Reports measured numbers0.81Is a runnable tool0.98Top-10 learning shortlist signal0.52Is a replica of the model0.1900.51Solves a common problem (0–2)1.24 / 2012

no-judgment band (0.40–0.60)

Design patterns
Questionnaire0.56Inspection0.55Menu0.39Question bank0.2900.51

no-judgment band (0.40–0.60)

The Jev model and date for each judgment stage are listed above. Card written by DeepSeek V4.1 Flash from the README on 27 Sept 2026.