jwadhams/json-logic-js

Health v2 · maintenance only

Adoption not part of the score

1479 stars · 145 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A JavaScript implementation of the JsonLogic format for building complex rules, serializing them as JSON, and executing them against data. It enables sharing the same rule logic between front-end and back-end code or storing rules in a database.

Use cases

• evaluate business rules stored as JSON in a database
• share validation rules between frontend and backend
• build a rules engine without writing a DSL parser
• apply conditional logic to user data in JavaScript
• serialize decision logic as portable JSON
• implement feature gating or eligibility checks with data-driven rules

When to choose

• you need rules that are serializable as JSON and portable across languages
• you want to evaluate logic against a data object in JavaScript
• you need to store rules alongside records in a database

When to avoid

• you need high-performance expression evaluation over large datasets
• you need a full programming language or scripting engine inside your app
• your rules require operations JsonLogic does not support and you cannot add custom operators

Facets

library · maturity stable

parser serialization developer-tools web-development browser rules-engine logic business-rules rule-evaluation automation nodejs javascript

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