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JSON-Patch

A leaner and meaner implementation of JSON-Patch. Small footprint. High performance.

With JSON-Patch, you can:

• apply patches (arrays) and single operations on JS object
• validate a sequence of patches
• observe for changes and generate patches when a change is detected
• compare two objects to obtain the difference

Tested in Firefox, Chrome, Edge, Safari, IE11, Deno and Node.js

Why you should use JSON-Patch

JSON-Patch (RFC6902) is a standard format that allows you to update a JSON document by sending the changes rather than the whole document. JSON Patch plays well with the HTTP PATCH verb (method) and REST style programming.

Mark Nottingham has a nice blog about it.

Install

Download as ZIP or install the current version using a package manager (and save it as a dependency):

# NPM
npm install fast-json-patch --save

Adding to your project

In a web browser

Load the bundled distribution script:

<script src="dist/fast-json-patch.min.js"></script>

In browsers that support ECMAScript modules, the below code uses this library as a module:

<script type="module">
  import * as jsonpatch from 'fast-json-patch/index.mjs';
  import { applyOperation } from 'fast-json-patch/index.mjs';
</script>

In Node.js

In Node 12+ with --experimental-modules flag, the below code uses this library as an ECMAScript module:

import * as jsonpatch from 'fast-json-patch/index.mjs';
import { applyOperation } from 'fast-json-patch/index.mjs';

In Webpack (and most surely other bundlers based on Babel), the below code uses this library as an ECMAScript module:

import * as jsonpatch from 'fast-json-patch';
import { applyOperation } from 'fast-json-patch';

In standard Node, the below code uses this library as a CommonJS module:

const { applyOperation } = require('fast-json-patch');
const applyOperation = require('fast-json-patch').applyOperation;

Directories

Directories used in this package:

• dist/ - contains ES5 files for a Web browser
• commonjs/ - contains CommonJS module and typings
• module/ - contains ECMAScript module and typings
• src/ - contains TypeScript source files

API

function applyPatch<T>(document: T, patch: Operation[], validateOperation?: boolean | Validator<T>, mutateDocument: boolean = true, banPrototypeModifications: boolean = true): PatchResult<T>

Applies patch array on obj.

• document The document to patch
• patch a JSON-Patch array of operations to apply
• validateOperation Boolean for whether to validate each operation with our default validator, or to pass a validator callback
• mutateDocument Whether to mutate the original document or clone it before applying
• banPrototypeModifications Whether to ban modifications to __proto__, defaults to true.

An invalid patch results in throwing an error (see jsonpatch.validate for more information about the error object).

It modifies the document object and patch - it gets the values by reference. If you would like to avoid touching your patch array values, clone them: jsonpatch.applyPatch(document, jsonpatch.deepClone(patch)).

Returns an array of OperationResult objects - one item for each item in patches, each item is an object {newDocument: any, test?: boolean, removed?: any}.

• test - boolean result of the test
• remove, replace and move - original object that has been removed
• add (only when adding to an array) - index at which item has been inserted (useful when using - alias)

• ** Note: It throws TEST_OPERATION_FAILED error if test operation fails. **

• ** Note II: the returned array has newDocument property that you can use as the final state of the patched document **.

• ** Note III: By default, when banPrototypeModifications is true, this method throws a TypeError when you attempt to modify an object's prototype.

• See Validation notes.

Example:

var document = { firstName: "Albert", contactDetails: { phoneNumbers: [] } };
var patch = [
  { op: "replace", path: "/firstName", value: "Joachim" },
  { op: "add", path: "/lastName", value: "Wester" },
  { op: "add", path: "/contactDetails/phoneNumbers/0", value: { number: "555-123" }  }
];
document = jsonpatch.applyPatch(document, patch).newDocument;
// document == { firstName: "Joachim", lastName: "Wester", contactDetails: { phoneNumbers: [{number:"555-123"}] } };

function applyOperation<T>(document: T, operation: Operation, validateOperation: boolean | Validator<T> = false, mutateDocument: boolean = true, banPrototypeModifications: boolean = true, index: number = 0): OperationResult<T>

Applies single operation object operation on document.

• document The document to patch
• operation The operation to apply
• validateOperation Whether to validate the operation, or to pass a validator callback
• mutateDocument Whether to mutate the original document or clone it before applying
• banPrototypeModifications Whether to ban modifications to __proto__, defaults to true.
• index The index of the operation in your patch array. Useful for better error reporting when that operation fails to apply.

It modifies the document object and operation - it gets the values by reference. If you would like to avoid touching your values, clone them: jsonpatch.applyOperation(document, jsonpatch.deepClone(operation)).

Returns an OperationResult object {newDocument: any, test?: boolean, removed?: any}.

• ** Note: It throws TEST_OPERATION_FAILED error if test operation fails. **

• ** Note II: By default, when banPrototypeModifications is true, this method throws a TypeError when you attempt to modify an object's prototype.

• See Validation notes.

Example:

var document = { firstName: "Albert", contactDetails: { phoneNumbers: [] } };
var operation = { op: "replace", path: "/firstName", value: "Joachim" };
document = jsonpatch.applyOperation(document, operation).newDocument;
// document == { firstName: "Joachim", contactDetails: { phoneNumbers: [] }}

jsonpatch.applyReducer<T>(document: T, operation: Operation, index: number): T

Ideal for patch.reduce(jsonpatch.applyReducer, document).

Applies single operation object operation on document.

Returns the a modified document.

Note: It throws TEST_OPERATION_FAILED error if test operation fails.

Example:

var document = { firstName: "Albert", contactDetails: { phoneNumbers: [ ] } };
var patch = [
  { op:"replace", path: "/firstName", value: "Joachim" },
  { op:"add", path: "/lastName", value: "Wester" },
  { op:"add", path: "/contactDetails/phoneNumbers/0", value: { number: "555-123" } }
];
var updatedDocument = patch.reduce(applyReducer, document);
// updatedDocument == { firstName:"Joachim", lastName:"Wester", contactDetails:{ phoneNumbers[ {number:"555-123"} ] } };

jsonpatch.deepClone(value: any): any

Returns deeply cloned value.

jsonpatch.escapePathComponent(path: string): string

Returns the escaped path.

jsonpatch.unescapePathComponent(path: string): string

Returns the unescaped path.

jsonpatch.getValueByPointer(document: object, pointer: string)

Retrieves a value from a JSON document by a JSON pointer.

Returns the value.

jsonpatch.observe(document: any, callback?: Function): Observer

Sets up an deep observer on document that listens for changes in object tree. When changes are detected, the optional callback is called with the generated patches array as the parameter.

Returns observer.

jsonpatch.generate(document: any, observer: Observer, invertible = false): Operation[]

If there are pending changes in obj, returns them synchronously. If a callback was defined in observe method, it will be triggered synchronously as well. If invertible is true, then each change will be preceded by a test operation of the value before the change.

If there are no pending changes in obj, returns an empty array (length 0).

Example:

var document = { firstName: "Joachim", lastName: "Wester", contactDetails: { phoneNumbers: [ { number:"555-123" }] } };
var observer = jsonpatch.observe(document);
document.firstName = "Albert";
document.contactDetails.phoneNumbers[0].number = "123";
document.contactDetails.phoneNumbers.push({ number:"456" });
var patch = jsonpatch.generate(observer);
// patch  == [
//   { op: "replace", path: "/firstName", value: "Albert"},
//   { op: "replace", path: "/contactDetails/phoneNumbers/0/number", value: "123" },
//   { op: "add", path: "/contactDetails/phoneNumbers/1", value: {number:"456"}}
// ];

Example of generating patches with test operations for values in the first object:

var document = { firstName: "Joachim", lastName: "Wester", contactDetails: { phoneNumbers: [ { number:"555-123" }] } };
var observer = jsonpatch.observe(document);
document.firstName = "Albert";
document.contactDetails.phoneNumbers[0].number = "123";
document.contactDetails.phoneNumbers.push({ number:"456" });
var patch = jsonpatch.generate(observer, true);
// patch  == [
//   { op: "test", path: "/firstName", value: "Joachim"},
//   { op: "replace", path: "/firstName", value: "Albert"},
//   { op: "test", path: "/contactDetails/phoneNumbers/0/number", value: "555-123" },
//   { op: "replace", path: "/contactDetails/phoneNumbers/0/number", value: "123" },
//   { op: "add", path: "/contactDetails/phoneNumbers/1", value: {number:"456"}}
// ];

jsonpatch.unobserve(document, observer)

jsonpatch.unobserve(document: any, observer: Observer): void

type JsonableObj = { [key:string]: Jsonable };
type JsonableArr = Jsonable[];
type Jsonable = JsonableArr | JsonableObj | string | number | boolean | null;

Destroys the observer set up on document.

Any remaining changes are delivered synchronously (as in jsonpatch.generate). Note: this is different that ES6/7 Object.unobserve, which delivers remaining changes asynchronously.

jsonpatch.compare(document1, document2, invertible)

jsonpatch.compare(document1: Jsonable, document2: Jsonable, invertible = false): Operation[]

type JsonableObj = { [key:string]: Jsonable };
type JsonableArr = Jsonable[];
type Jsonable = JsonableArr | JsonableObj | string | number | boolean | null;

Compares object trees document1 and document2 and returns the difference relative to document1 as a patches array. If invertible is true, then each change will be preceded by a test operation of the value in document1.

If there are no differences, returns an empty array (length 0).

Example:

var documentA = {user: {firstName: "Albert", lastName: "Einstein"}};
var documentB = {user: {firstName: "Albert", lastName: "Collins"}};
var diff = jsonpatch.compare(documentA, documentB);
//diff == [{op: "replace", path: "/user/lastName", value: "Collins"}]

Example of comparing two object trees with test operations for values in the first object:

var documentA = {user: {firstName: "Albert", lastName: "Einstein"}};
var documentB = {user: {firstName: "Albert", lastName: "Collins"}};
var diff = jsonpatch.compare(documentA, documentB, true);
//diff == [
//   {op: "test", path: "/user/lastName", value: "Einstein"},
//   {op: "replace", path: "/user/lastName", value: "Collins"}
// ];

jsonpatch.validate(patch: Operation[], document?: any, validator?: Function): JsonPatchError

See Validation notes

Validates a sequence of operations. If document parameter is provided, the sequence is additionally validated against the object tree.

If there are no errors, returns undefined. If there is an errors, returns a JsonPatchError object with the following properties:

• name String - short error code
• message String - long human readable error message
• index Number - index of the operation in the sequence
• operation Object - reference to the operation
• tree Object - reference to the tree

Possible errors:

Example:

var obj = {user: {firstName: "Albert"}};
var patches = [{op: "replace", path: "/user/firstName", value: "Albert"}, {op: "replace", path: "/user/lastName", value: "Einstein"}];
var errors = jsonpatch.validate(patches, obj);
if (errors.length == 0) {
 //there are no errors!
}
else {
  for (var i=0; i < errors.length; i++) {
    if (!errors[i]) {
      console.log("Valid patch at index", i, patches[i]);
    }
    else {
      console.error("Invalid patch at index", i, errors[i], patches[i]);
    }
  }
}

OperationResult Type

Functions applyPatch and applyOperation both return OperationResult object. This object is:

{newDocument: any, test?: boolean, removed?: any}

Where:

• newDocument: the new state of the document after the patch/operation is applied.
• test: if the operation was a test operation. This will be its result.
• removed: contains the removed, moved, or replaced values from the document after a remove, move or replace operation.

Validation Notes

Functions applyPatch, applyOperation, and validate accept a validate/ validator parameter:

• If the validateOperation parameter is set to false, validation will not occur.
• If set to true, the patch is extensively validated before applying using jsonpatch's default validation.
• If set to a function callback, the patch is validated using that function.

If you pass a validator, it will be called with four parameters for each operation, function(operation, index, tree, existingPath) and it is expected to throw JsonPatchError when your conditions are not met.

• operation The operation it self.
• index operation's index in the patch array (if application).
• tree The object that is supposed to be patched.
• existingPath the path operation points to.

Overwriting and move Operation

When the target of the move operation already exists, it is cached, deep cloned and returned as removed in OperationResult.

und