json-patch

jsonpatch-js

Library to apply JSON Patches in JavaScript

• JSON Patch - http://tools.ietf.org/html/rfc6902
• JSON Pointer - http://tools.ietf.org/html/rfc6901

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}]);
 
// Replace 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'}]

Changed in 0.5.0

The return value is no longer a boolean, but now the the document itself which adheres correctly to the specification. It the test fails, a PatchTestFailed error will be thrown.

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.

PatchTestFailed

Thrown when a test operation is applied and fails.