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fast-json-patch

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fast-json-patch

Fast implementation of JSON-Patch (RFC-6902) with duplex (observe changes) capabilities

  • 3.1.1
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  • npm
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What is fast-json-patch?

The fast-json-patch package allows for the observation of changes to a JSON document, generating JSON Patch documents to capture these changes, and applying such patches to JSON documents. It is useful for efficiently synchronizing JSON data between clients and servers or among components of an application.

What are fast-json-patch's main functionalities?

Generating patches

This feature allows for the observation of a JSON document and the generation of a JSON Patch document representing the changes made to the observed document.

const jsonpatch = require('fast-json-patch');
const document = { firstName: 'Albert', contact: { phone: '123' } };
const observer = jsonpatch.observe(document);
document.firstName = 'Joachim';
document.contact.phone = '456';
const patches = jsonpatch.generate(observer);

Applying patches

This feature applies a JSON Patch document to a JSON document, modifying the target document according to the operations described in the patch.

const jsonpatch = require('fast-json-patch');
const document = { firstName: 'Albert', contact: { phone: '123' } };
const patches = [{ op: 'replace', path: '/firstName', value: 'Joachim' }, { op: 'replace', path: '/contact/phone', value: '456' }];
jsonpatch.applyPatch(document, patches);

Validating a sequence of operations

This feature validates a sequence of operations against a JSON document to ensure they can be applied without errors, providing a way to check patches for correctness before application.

const jsonpatch = require('fast-json-patch');
const document = { firstName: 'Albert', contact: { phone: '123' } };
const patches = [{ op: 'replace', path: '/firstName', value: 'Joachim' }, { op: 'add', path: '/lastName', value: 'Wagner' }];
const validationResult = jsonpatch.validate(patches, document);

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Package last updated on 24 Mar 2022

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