JSON Patch RFC 6902 (and diff) implementation for JavaScript.
See jsonpatch.com for more information about JSON Patch.
JSON8 Patch passes the entire json-patch-tests suite; see Tests
npm install json8-patch
var ooPatch = require('json8-patch');or
<script src="node_modules/json8-patch/JSON8Patch.js"></script>var ooPatch = window.JSON8PatchFor performance concerns JSON8 Patch may mutate target document; if you want it to use its own copy use:
var oo = require('json8')
var myDocument = {foo: 'bar'}
var doc = oo.clone(myDocument)See clone.
JSON8 Patch never mutates patches.
doc = ooPatch.apply(doc, patch).doc;ooPatch.apply (and other ooPatch methods) returns an object with a doc property because per specification a patch can replace the original root document.
The operation is atomic, if any of the patch operation fails, the document will be restored to its original state and an error will be thrown.
Alias for apply method.
If the patch or apply method is called with a third argument {reversible: true} it will return an additional value in the form of a revert property.
The revert object can be used to revert a patch on a document.
// apply the patch with the reversible option
var applyResult = ooPatch.apply(doc, patch, {reversible: true});
doc = applyResult.doc
// revert the patch
doc = ooPatch.revert(doc, applyResult.revert).doc;
// doc is strictly identical to the originalSee also buildRevertPatch which offers more flexibility.
Builds a valid JSON Patch from the result of a reversible apply operation. You can then use this patch with apply method to revert a previously applied patch.
// apply the patch
var applyResult = ooPatch.apply(doc, patch, {reversible: true});
doc = applyResult.doc
// revert the patch
var revertPatch = ooPatch.buildRevertPatch(applyResult.revert) // this is a valid JSON Patch
doc = ooPatch.apply(doc, revertPatch).doc
// doc is strictly identical to the originalBecause buildRevertPatch + apply offers more flexibility over revert it is preferred.
- use pack/unpack with the result of
buildRevertPatchmaking it ideal for storage or transport - reverse a revert (and so on...) with
{reversible: true} - diff between reverts
- merge multiple reverts into one
- rebase reverts
Returns a diff in the form of a JSON Patch for 2 JSON values.
ooPatch.diff(true, false)
// [{"op": "replace", "path": "", "value": "false"}]
ooPatch.diff([], [])
// []
ooPatch.diff({}, {"foo": "bar"})
// [{"op": "add", "path": "/foo", "value": "bar"}]Returns true if the patch is valid, false otherwise.
This method only check for JSON Patch semantic. If you need to verify the patch is JSON valid, use oo.valid
ooPatch.valid({}) // false
ooPatch.valid([{}] // false
ooPatch.valid([{op: "foo", path: null, value: undefined}]) // false
ooPatch.valid([{op: "add", path: "/foo"}]) // false
ooPatch.valid([]) // true
ooPatch.valid([{op: "add", path: "/foo", value: "bar"}]) // trueConcats multiple patches into one.
var patch1 = [{op: "add", value: "bar", path: "/foo"}]
var patch2 = [{op: "remove", path: "/foo"}]
var patch = ooPatch.concat(patch1, patch2)
// patch is
[
{op: "add", value: "bar", path: "/foo"},
{op: "remove", path: "/foo"}
]add, copy, replace, move, remove, test operations return an object of the form {doc: document, previous: value}
docis the patched documentpreviousis the previous/replaced value
doc = ooPatch.add(doc, '/foo', 'foo').doc;doc = ooPatch.remove(doc, '/foo').doc;doc = ooPatch.replace(doc, '/foo', 'foo').doc;doc = ooPatch.move(doc, '/foo', '/bar').doc;doc = ooPatch.copy(doc, '/foo', '/bar').doc;doc = ooPatch.test(doc, '/foo', 'bar').doc;Those are not part of the standard and are only provided for convenience.
ooPatch.get(doc, '/foo');
// returns value at /fooooPatch.has(doc, '/foo');
// returns true if there is a value at /fooPer specification patches are pretty verbose. JSON8 provides pack and unpack methods to reduce the size of patches and save memory/space/bandwidth.
Size (in bytes) comparaison for the following patch file
[
{"op": "add", "path": "/a/b/c", "value": ["foo", "bar"]},
{"op": "remove", "path": "/a/b/c"},
{"op": "replace", "path": "/a/b/c", "value": 42},
{"op": "move", "from": "/a/b/c", "path": "/a/b/d"},
{"op": "copy", "from": "/a/b/c", "path": "/a/b/e"},
{"op": "test", "path": "/a/b/c", "value": "foo"}
]| format | size (in bytes) |
|---|---|
| unpacked | 313 |
| unpacked gzip | 148 |
| packed | 151 |
| packed gzip | 99 |
In pratice I'd recommand to use pack/unpack if
- data compression cannot be used on the transport of the patch
- keeping a large amount of patches in memory/on disk
var patch = [
{"op": "add", "path": "/a/b/c", "value": ["foo", "bar"]},
{"op": "remove", "path": "/a/b/c"},
{"op": "replace", "path": "/a/b/c", "value": 42},
{"op": "move", "from": "/a/b/c", "path": "/a/b/d"},
{"op": "copy", "from": "/a/b/c", "path": "/a/b/e"},
{"op": "test", "path": "/a/b/c", "value": "foo"}
];
var packed = ooPatch.pack(patch);Here is what packed looks like
[
[0, "/a/b/c", ["foo", "bar"]],
[1, "/a/b/c"],
[2, "/a/b/c", 42],
[3, "/a/b/d", "/a/b/c"],
[4, "/a/b/e", "/a/b/c"],
[5, "/a/b/c", "foo"],
]var patch = ooPatch.unpack(packed);
// [{...}, {...}, ...]npm install mocha browserify
npm test
See CONTRIBUTING.md
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