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eval-json-path

v1.0.3

Published

Evaluate and query json object value at given path

Downloads

399

Readme

eval-json-path

Evaluate/Query the value of json object at given path

JavaScript Style Guide

Commonly js object variable can be accessed by property name or index. This module allow to access by path/steps given by a string

Usage


const evalJsonPath = require('eval-json-path')

const value = evalJsonPath(obj, 'prop.subprop[prett-prop][3].lastprop')

const sameValue = obj.prop.subprop['prett-prop'][3].lastprop

The evaluation is done by each step, which is null-safe, any not-existing step will result undefined or fallback

API

evalJsonPath(obj, path, fallback)

  • obj: The object should has sub property
  • path: A string represent the path/steps
  • fallback: A optional fallback for any not-existing step

More Examples

const obj = {
  step1: {
    step2: {
      'pretty.nice-step': [
        {},
        {step3: 4}
      ]
    }
  }
}

evalJsonPath(null, 'step1'); // undefined

evalJsonPath(undefined, 'step1'); // undefined

evalJsonPath(3, 'step1'); // undefined

evalJsonPath(false, 'step1'); // undefined

evalJsonPath(obj, 'step1'); // same as obj.step1

evalJsonPath(obj, 'step1.step2'); // same as obj.step1.step2

evalJsonPath(obj, 'step1.step2[pretty.nice-step]'); // obj.step1.step2['pretty.nice-step'])

evalJsonPath(obj, 'step1.step2[pretty.nice-step][1].step3'); // obj.step1.step2['pretty.nice-step'][1].step3)

evalJsonPath(obj, 'step1.xxxxx[pretty.nice-step][1].step3'); // any non-exist step result undefined