A complete implementation of JSON Pointer (RFC 6901) for nodejs and modern browsers.
The json-ptr npm package provides utilities for working with JSON Pointers (RFC 6901) and JSON References (RFC 6901). It allows you to create, parse, and resolve JSON Pointers and References, making it easier to navigate and manipulate JSON data structures.
Creating JSON Pointers
This feature allows you to create JSON Pointers from a string path. The example demonstrates creating a JSON Pointer for the path '/foo/bar'.
const ptr = require('json-ptr');
const pointer = ptr.create('/foo/bar');
console.log(pointer.toString()); // '/foo/bar'Resolving JSON Pointers
This feature allows you to resolve a JSON Pointer against a JSON document to retrieve the value at the specified path. The example shows how to get the value 'baz' from the path '/foo/bar' in the given document.
const ptr = require('json-ptr');
const document = { foo: { bar: 'baz' } };
const value = ptr.get(document, '/foo/bar');
console.log(value); // 'baz'Parsing JSON Pointers
This feature allows you to parse a JSON Pointer into its component parts. The example demonstrates parsing the pointer '/foo/bar' into an array of its segments.
const ptr = require('json-ptr');
const parsed = ptr.parse('/foo/bar');
console.log(parsed); // ['foo', 'bar']Handling JSON References
This feature allows you to resolve JSON References within a document. The example shows how to resolve a reference to the path '#/foo/bar' and retrieve the value 'baz'.
const ptr = require('json-ptr');
const document = { foo: { bar: 'baz' }, ref: { '$ref': '#/foo/bar' } };
const value = ptr.resolve(document, document.ref);
console.log(value); // 'baz'The jsonpointer package provides similar functionality for resolving JSON Pointers. It allows you to get and set values in a JSON document using JSON Pointers. Compared to json-ptr, jsonpointer is more focused on basic get and set operations and may not have as extensive support for JSON References.
The json-ref package focuses on resolving JSON References within a document. It provides utilities for dereferencing JSON References and is useful for working with JSON schemas. Compared to json-ptr, json-ref is more specialized in handling JSON References and may not provide as much functionality for working with JSON Pointers.
The jsonpath package provides a way to query JSON documents using JSONPath expressions, which are more powerful and flexible than JSON Pointers. While jsonpath offers more advanced querying capabilities, it is not directly focused on JSON Pointers or References like json-ptr.
A complete implementation of JSON Pointer (RFC 6901) for nodejs and modern browsers.
I wrote this a few years back when I was unable to find a complete implementation of RFC 6901. It turns out that I now use the hell out of it.
npm install json-ptr
import { JsonPointer, create } from 'json-ptr';
There are many uses for JSON Pointers, here's one we encountered when we updated a public API and suddenly had clients sending two different message bodies to our APIs. This example is contrived to illustrate how we supported both new and old incoming messages:
// examples/versions.ts
import { JsonPointer } from 'json-ptr';
export type SupportedVersion = '1.0' | '1.1';
interface PrimaryGuestNamePointers {
name: JsonPointer;
surname: JsonPointer;
honorific: JsonPointer;
}
const versions: Record<SupportedVersion, PrimaryGuestNamePointers> = {
'1.0': {
name: JsonPointer.create('/guests/0/name'),
surname: JsonPointer.create('/guests/0/surname'),
honorific: JsonPointer.create('/guests/0/honorific'),
},
'1.1': {
name: JsonPointer.create('/primary/primaryGuest/name'),
surname: JsonPointer.create('/primary/primaryGuest/surname'),
honorific: JsonPointer.create('/primary/primaryGuest/honorific'),
}
};
interface Reservation extends Record<string, unknown> {
version?: SupportedVersion;
}
/**
* Gets the primary guest's name from the specified reservation.
* @param reservation a reservation, either version 1.0 or bearing a `version`
* property indicating the version.
*/
function primaryGuestName(reservation: Reservation): string {
const pointers = versions[reservation.version || '1.0'];
if (!pointers) {
throw new Error(`Unsupported reservation version: ${reservation.version}`);
}
const name = pointers.name.get(reservation) as string;
const surname = pointers.surname.get(reservation) as string;
const honorific = pointers.honorific.get(reservation) as string;
const names: string[] = [];
if (honorific) names.push(honorific);
if (name) names.push(name);
if (surname) names.push(surname);
return names.join(' ');
}
// The original layout of a reservation (only the parts relevant to our example)
const reservationV1: Reservation = {
guests: [{
name: 'Wilbur',
surname: 'Finkle',
honorific: 'Mr.'
}, {
name: 'Wanda',
surname: 'Finkle',
honorific: 'Mrs.'
}, {
name: 'Wilma',
surname: 'Finkle',
honorific: 'Miss',
child: true,
age: 12
}]
// ...
};
// The new layout of a reservation (only the parts relevant to our example)
const reservationV1_1: Reservation = {
version: '1.1',
primary: {
primaryGuest: {
name: 'Wilbur',
surname: 'Finkle',
honorific: 'Mr.'
},
additionalGuests: [{
name: 'Wanda',
surname: 'Finkle',
honorific: 'Mrs.'
}, {
name: 'Wilma',
surname: 'Finkle',
honorific: 'Miss',
child: true,
age: 12
}]
// ...
}
// ...
};
console.log(primaryGuestName(reservationV1));
console.log(primaryGuestName(reservationV1_1));
The API documentation is generated from code comments by typedoc and hosted on github. Read the docs.
We welcome new issues if you have questions or need additional documentation.
We're maintaining near 100% test coverage. Visit our circleci build page and drill down on a recent build's build and test step to see where we're at. It should look something like:
=============================== Coverage summary ===============================
Statements : 100% ( 270/270 )
Branches : 100% ( 172/172 )
Functions : 100% ( 49/49 )
Lines : 100% ( 265/265 )
================================================================================
We use mocha so you can also clone the code and:
$ npm install
$ npm test
Once you've run the tests on the command line you can open up ./tests.html in the browser of your choice.
WARNING! These performance metrics are quite outdated. We'll be updating as soon as we have time.
This repository has a companion repository that makes some performance comparisons between json-ptr, jsonpointer and json-pointer.
All timings are expressed as nanoseconds:
.flatten(obj)
...
MODULE | METHOD | COMPILED | SAMPLES | AVG | SLOWER
json-pointer | dict | | 10 | 464455181 |
json-ptr | flatten | | 10 | 770424039 | 65.88%
jsonpointer | n/a | | - | - |
.has(obj, pointer)
...
MODULE | METHOD | COMPILED | SAMPLES | AVG | SLOWER
json-ptr | has | compiled | 1000000 | 822 |
json-ptr | has | | 1000000 | 1747 | 112.53%
json-pointer | has | | 1000000 | 2683 | 226.4%
jsonpointer | n/a | | - | - |
.has(obj, fragmentId)
...
MODULE | METHOD | COMPILED | SAMPLES | AVG | SLOWER
json-ptr | has | compiled | 1000000 | 602 |
json-ptr | has | | 1000000 | 1664 | 176.41%
json-pointer | has | | 1000000 | 2569 | 326.74%
jsonpointer | n/a | | - | - |
.get(obj, pointer)
...
MODULE | METHOD | COMPILED | SAMPLES | AVG | SLOWER
json-ptr | get | compiled | 1000000 | 590 |
json-ptr | get | | 1000000 | 1676 | 184.07%
jsonpointer | get | compiled | 1000000 | 2102 | 256.27%
jsonpointer | get | | 1000000 | 2377 | 302.88%
json-pointer | get | | 1000000 | 2585 | 338.14%
.get(obj, fragmentId)
...
MODULE | METHOD | COMPILED | SAMPLES | AVG | SLOWER
json-ptr | get | compiled | 1000000 | 587 |
json-ptr | get | | 1000000 | 1673 | 185.01%
jsonpointer | get | compiled | 1000000 | 2105 | 258.6%
jsonpointer | get | | 1000000 | 2451 | 317.55%
json-pointer | get | | 1000000 | 2619 | 346.17%
These results have been elided because there is too much detail in the actual. Your results will vary slightly depending on the resources available where you run it.
It is important to recognize in the performance results that compiled options are faster. As a general rule, you should compile any pointers you'll be using repeatedly.
2020-07-10 — 1.3.0
.unset() function contributed by @chrishalbert, updated dependencies.2019-09-14 — 1.2.0
.concat function contributed by @vuwuv, updated dependencies.2019-03-10 — 1.1.2
2016-07-26 — 1.0.1
2016-01-12 — 1.0.0
.list(obj, fragmentId).2016-01-02 — 0.3.0
.list function.map function2014-10-21 — 0.2.0 Added #list function to enumerate all properties in a graph, producing fragmentId/value pairs.
FAQs
A complete implementation of JSON Pointer (RFC 6901) for nodejs and modern browsers.
The npm package json-ptr receives a total of 241,569 weekly downloads. As such, json-ptr popularity was classified as popular.
We found that json-ptr demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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