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Gathering detailed insights and metrics for json-logic-engine

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Gathering detailed insights and metrics for json-logic-engine

json-logic-engine - 5.0.1 | npmpackage.info

json-logic-engine

Construct complex rules with JSON & process them.

5.0.1

MIT

JavaScript

358.97 kB

3.1

Installations

npm install json-logic-engine

Developer Guide

BETA

Typescript

Yes

Module System

ESM

Min. Node Version

>=12.22.7

Pull Requests

Open

3

Total

25

Closed

1

Merged

21

Issues

Open

1

Total

22

Closed

21

Releases

v5.0.0

5.0.0

Updated on May 26, 2025

View All 1 releases

Languages

JavaScript

JavaScript (100%)

Developer

TotalTechGeek

Download Statistics

Total Downloads

Last Day

Last Week

Last Month

Last Year

GitHub Statistics

MIT License

66 Stars

356 Commits

12 Forks

3 Watchers

4 Branches

8 Contributors

Updated on Jun 30, 2025

Maintainers

View All 8 Contributors

Package Meta Information

Latest Version

5.0.1

Package Id

json-logic-engine@5.0.1

Unpacked Size

358.97 kB

Size

65.43 kB

File Count

Published on

Jun 11, 2025

Total Downloads

Cumulative downloads

Total Downloads

NaN

Last Day

NaN

Compared to previous day

Last Week

NaN

Compared to previous week

Last Month

NaN

Compared to previous month

Last Year

NaN

Compared to previous year

Weekly Downloads

Monthly Downloads

Yearly Downloads

Dev Dependencies

coveralls cross-env eslint eslint-config-standard eslint-plugin-import eslint-plugin-node eslint-plugin-promise jest nyc rollup run-script-os standard typescript

JSON Logic Engine

Logo

Fast, Powerful, and Persistable Logic

Have you ever needed the ability to write a custom set of logic or set of rules for a particular customer? Or needed to be able to configure a piece of logic on the fly?

JSON Logic might be your solution! Designed with a lisp-like syntax, JSON Logic makes it easy to write safe instructions that can be persisted into a database, and shared between the front-end and back-end.

Check out our Documentation Here.

The engine supports both synchronous & asynchronous operations, and can use function compilation to keep your logic performant at scale.

Examples:

The premise is the logic engine traverses the document you pass in, and each "object" is interpreted as an instruction for the engine to run.

1logic.run({
2    '+': [1,2,3,4,5]
3}) // 15

If you wanted to start factoring variables, you can pass a data object into it, and reference them using the "var" instruction:

1logic.run({
2    '+': [11, { var: 'a' }]
3}, {
4    'a': 17
5}) // 28

The engine will also allow you to reference variables that are several layers deep:

1logic.run({
2    '+': [{ var: 'a.b.c' }, 5]
3}, {
4    a: { b: { c: 7 } }
5}) // 12

Let's explore some slightly more complex logic:

1logic.run({
2    'reduce': [{ var: 'x' }, { '+': [{ var: 'current' }, { var: 'accumulator' }] }, 0]
3}, {
4    'x': [1,2,3,4,5]
5}) // 15

In this example, we run the reduce operation on a variable called "x", and we set up instructions to add the "current" value to the "accumulator", which we have set to 0.

Similarly, you can also do map operations:

1logic.run({
2    'map': [[1,2,3,4,5], { '+': [{ var: '' }, 1] }]
3}) // [2,3,4,5,6]

If var is left as an empty string, it will assume you're referring to the whole variable that is accessible at the current layer it is looking at.

Example of a map accessing variables of the objects in the array:

1logic.run({
2    'map': [{var : 'x'}, { '+': [{ var: 'a' }, 1] }]
3},
4{
5    'x': [{ a: 1 }, { a: 2 }, { a: 3 }, { a: 4 }]
6}) // [2,3,4,5]

You can easily nest different operations in each other, like so:

1logic.run({
2    max: [200, {
3        '*': [12, {var: 'a' }]
4    }]
5}, {
6    a: 16
7}) // 200

The engine also supports Handlebars-esque style traversal of data when you use the iterative control structures.

For example:

1logic.run({
2    'map': [{var : 'x'}, { '+': [{ var: 'a' }, { var: '../../adder'}] }]
3},
4{
5    'x': [{ a: 1 }, { a: 2 }, { a: 3 }, { a: 4 }],
6    'adder':  7
7}) // [8, 9, 10, 11]

This library was developed to be (for the most part) a drop-in replacement for the popular npm module json-logic-js.

The intention of the library is to keep the functionality very similar to the original, while adding a few useful utilities.

No vulnerabilities found.

10

Dangerous-Workflow

Determines if the project's GitHub Action workflows avoid dangerous patterns.

10

Binary-Artifacts

Determines if the project has generated executable (binary) artifacts in the source repository.

10

License

Determines if the project has defined a license.

6

Maintained

Determines if the project is "actively maintained".

0

Code-Review

Determines if the project requires human code review before pull requests (aka merge requests) are merged.

0

SAST

Determines if the project uses static code analysis.

0

Token-Permissions

Determines if the project's workflows follow the principle of least privilege.

0

Pinned-Dependencies

Determines if the project has declared and pinned the dependencies of its build process.

0

CII-Best-Practices

Determines if the project has an OpenSSF (formerly CII) Best Practices Badge.

0

Fuzzing

Determines if the project uses fuzzing.

0

Branch-Protection

Determines if the default and release branches are protected with GitHub's branch protection settings.

0

Security-Policy

Determines if the project has published a security policy.

0

Vulnerabilities

Determines if the project has open, known unfixed vulnerabilities.

Score

3.1

/10

Last Scanned on 2025-07-07

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