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json-logic extended with json-ng paths

5 starsPython

JSON-logic-path – JSON logic with jsonpath multi-value resolution

by anax32·Apr 18, 2026·2 points·0 comments
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AI Analysis

●●SolidNiche GemBig Brain

JSONPath `vars` operator handles array queries when standard JsonLogic only does scalar lookups.

Strengths
  • •JSONPath `vars` enables fan-in gates across parallel workflow step outputs
  • •Backward compatible—existing `var` rules work without modification
  • •Python 3.11+ update revives unmaintained json-logic-py reference implementation
Weaknesses
  • •Niche audience—JsonLogic itself isn't widely adopted in modern stacks
  • •No TypeScript or Go implementations limits cross-language workflow adoption
Target Audience

Backend developers building workflow engines or rule-based systems

Similar To

json-logic-py · json-logic-js · JSONata

Post Description

The reference Python implementation (nadirizr/json-logic-py) hadn't been updated for modern Python. We forked it to fix that, then added a vars operator backed by JSONPath for multi-value resolution -- useful when branch conditions need to evaluate model outputs or array-valued fields.

Not part of the standard; the var operator is unchanged so existing rules work without modification.

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