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jpath-query's Introduction

What is this?

This is a very simple set of functions that allows you to write simple queries against json payloads. You can install it via npm.

npm install jpath-query

What does it do, exactly?

Let's say you have a json payload from a web service that looks like this:

{ items: [ { name: 'hello', kind: 'message' },
           { name: 'world', size: 20 },
           { kind: 'notice', date: '2008-12-20T13:00:00.132Z' } ],
  messages: { 'error': [ ],
              'quota': '5 remaining calls' } }

If you want to get the items, you'd have to write a nested if/else loop to make sure the key existed and that it had data an everything else.

For example, if you assigned that json to var data, and you wanted to get the kind of the 3rd dictionary in the items keys you might do somthing like this:

if (data.items && data.items.length >= 2) {
  if (data.items[2]) {
     return data.items[2].kind;
  }
}

Or you could use jpath-query. Which turns that nested if into this:

var query = require('jpath-query');
console.log(query.jpath('/items/2/kind',data));

You can even specify a default return value if the query you send doesn't find anything.

var default = 'I found nothing';
console.log(query.jpath('/items/2/kind/missing',data,default));

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