jevrecipes

Recipe catalog / field-select

Select a field value

Which supplied candidate is the value of field in document?

You need to select which supplied candidate expresses a field value in a document.

Explore this recipe interactively ยท Source and implementation guide

Use field-select in TypeScript

Install with npm install jev-recipes. Requires Node.js 22.9 or newer and ES modules. Set TYPESAFE_API_KEY in your server environment for live calls, which send input to TypeSafe and use API quota. See the installation guide.

import { fieldSelect } from 'jev-recipes/field-select';

const result = await fieldSelect({
  "field": "Invoice reference",
  "document": "Invoice INV-2026-A. Purchase order PO-77.",
  "candidates": [
    {
      "id": "invoice",
      "text": "INV-2026-A"
    },
    {
      "id": "purchase-order",
      "text": "PO-77"
    }
  ]
});
console.log(result);

Input contract

FieldTypeNeeded
fieldstringRequired
documentstringRequired
candidatesarrayRequired
minConfidencenumberOptional
Full input and result schemas
{
  "input": {
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "type": "object",
    "properties": {
      "field": {
        "type": "string"
      },
      "document": {
        "type": "string"
      },
      "candidates": {
        "minItems": 1,
        "maxItems": 50,
        "type": "array",
        "items": {
          "type": "object",
          "properties": {
            "id": {
              "type": "string"
            },
            "text": {
              "type": "string"
            }
          },
          "required": [
            "id",
            "text"
          ]
        }
      },
      "minConfidence": {
        "type": "number",
        "minimum": 0,
        "maximum": 1
      }
    },
    "required": [
      "field",
      "document",
      "candidates"
    ]
  },
  "result": {
    "$schema": "https://json-schema.org/draft/2020-12/schema",
    "type": "object",
    "properties": {
      "model": {
        "type": "string"
      },
      "usage": {
        "type": "object",
        "properties": {
          "input_tokens": {
            "type": "integer",
            "minimum": 0,
            "maximum": 9007199254740991
          },
          "output_tokens": {
            "type": "integer",
            "minimum": 0,
            "maximum": 9007199254740991
          }
        },
        "required": [
          "input_tokens",
          "output_tokens"
        ],
        "additionalProperties": false
      },
      "status": {
        "type": "string",
        "enum": [
          "ready",
          "review"
        ]
      },
      "verdict": {
        "type": "string",
        "enum": [
          "matched",
          "none",
          "ambiguous"
        ]
      },
      "selection": {
        "type": [
          "string",
          "null"
        ]
      },
      "suggestedSelection": {
        "type": [
          "string",
          "null"
        ]
      },
      "confidence": {
        "type": "number",
        "minimum": 0,
        "maximum": 1
      },
      "probabilities": {
        "type": "object",
        "properties": {
          "candidates": {
            "type": "object",
            "propertyNames": {
              "type": "string"
            },
            "additionalProperties": {
              "type": "number",
              "minimum": 0,
              "maximum": 1
            }
          },
          "none": {
            "type": "number",
            "minimum": 0,
            "maximum": 1
          },
          "ambiguous": {
            "type": "number",
            "minimum": 0,
            "maximum": 1
          }
        },
        "required": [
          "candidates",
          "none",
          "ambiguous"
        ],
        "additionalProperties": false
      }
    },
    "required": [
      "model",
      "usage",
      "status",
      "verdict",
      "selection",
      "suggestedSelection",
      "confidence",
      "probabilities"
    ],
    "additionalProperties": false
  }
}

Saved example result

This hand-authored response demonstrates the contract. It is not a model accuracy measurement. Run it without an API key: npx jev-recipes demo field-select.

{
  "model": "demo-fixture",
  "usage": {
    "input_tokens": 0,
    "output_tokens": 0
  },
  "status": "ready",
  "verdict": "matched",
  "selection": "invoice",
  "suggestedSelection": "invoice",
  "confidence": 0.96,
  "probabilities": {
    "candidates": {
      "invoice": 1,
      "purchase-order": 0
    },
    "none": 0,
    "ambiguous": 0
  }
}

Evaluation evidence

Earlier-evaluator measurement

jev-1.13.0 / 2026-09-27 / 40 held-out cases

Scoring revision 1.

100%All-case accuracy
10Sent for review
0Failed calls / cases

30 ready decisions, with 100% accuracy among those decisions.

95% case-level interval: 91% to 100%. Related synthetic cases are correlated.

Measured on these synthetic cases

This measurement uses an earlier or unverified recipe or evaluator version. Rerun with the current recipe and evaluator before treating these numbers as current.

Full report and missesDataset and labels

Use the evaluation guide to measure this decision on your own labeled cases.

Limitations

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