json-patch

A JavaScript implementation of the JSON Media Type for partial modifications: http://tools.ietf.org/html/rfc6902

npm install json-patch
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jsonpatch-js

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Library to apply JSON Patches in JavaScript

jsonpatch-js works as in the browser as a script, as a Node module and as an AMD module.

Install

Bower

bower install json-patch

NPM

npm install json-patch

Note: at this time, all operations are applied in-place.

Methods

jsonpatch.apply(document, patch)

Applies a patch to the document

jsonpatch.compile(patch)

Compiles a patch and returns a function that takes a document to apply the patch to.

Patch Operations

Add

Patch syntax: {op: 'add', path: <path>, value: <value>}

// Add property, result: {foo: 'bar'}
jsonpatch.apply({}, [{op: 'add', path: '/foo', value: 'bar'}]);

// Add array element, result: {foo: [1, 2, 3]}
jsonpatch.apply({foo: [1, 3]}, [{op: 'add', path: '/foo/1', value: 2}]);

// Complex, result: {foo: [{bar: 'baz'}]}
jsonpatch.apply({foo: [{}]}, [{op: 'add', path: '/foo/0/bar', value: 'baz'}]);

Remove

Patch syntax: {op: 'remove', path: <path>}

// Remove property, result: {}
jsonpatch.apply({foo: 'bar'}, [{op: 'remove', path: '/foo'}]);

// Remove array element, result: {foo: [1, 3]}
jsonpatch.apply({foo: [1, 2, 3]}, [{op: 'remove', path: '/foo/1'}]);

// Complex, result: {foo: [{}]}
jsonpatch.apply({foo: [{bar: 'baz'}]}, [{op: 'remove', path: '/foo/0/bar'}]);

Replace

Patch syntax: {op: 'replace', path: <path>, value: <value>}

// Replace property, result: {foo: 1}
jsonpatch.apply({foo: 'bar'}, [{op: 'replace', path: '/foo', value: 1}]);

// Repalce array element, result: {foo: [1, 4, 3]}
jsonpatch.apply({foo: [1, 2, 3]}, [{op: 'replace', path: '/foo/1', value: 4}]);

// Complex, result: {foo: [{bar: 1}]}
jsonpatch.apply({foo: [{bar: 'baz'}]}, [{op: 'replace', path: '/foo/0/bar', value: 1}]);

Move

Patch syntax: {op: 'move', from: <path>, path: <path>}

// Move property, result {bar: [1, 2, 3]}
jsonpatch.apply({foo: [1, 2, 3]}, [{op: 'move', from: '/foo', path: '/bar'}]);

Copy

Patch syntax: {op: 'copy', from: <path>, path: <path>}

// Copy property, result {foo: [1, 2, 3], bar: 2}
jsonpatch.apply({foo: [1, 2, 3]}, [{op: 'copy', from: '/foo/1', path: '/bar'}]);

Test

Patch syntax: {op: 'test', path: <path>, value: <value>}

// Test equality of property to value, result: true
jsonpatch.apply({foo: 'bar'}, [{op: 'test', path: '/foo', value: 'bar'}]

Error Types

JSONPatchError

Base error type which all patch errors extend from.

InvalidPointerError

Thrown when the pointer is invalid.

InvalidPatchError

Thrown when the patch itself has an invalid syntax.

PatchConflictError

Thrown when there is a conflic with applying the patch to the document.

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