Add json.js

json.js.md

@@ -0,0 +1,31 @@
+```javascript
+import { jsonQuery, jsonPatch, tokenizePath } from './json.js';
+```
+
+## jsonQuery(model, path, ?default) → mixed
+
+Lookup a key, or an array of keys from the structure in `model`. The path uses a simplified syntax to select the nodes:
+
+- `.foo` - the node **foo** in the root.
+- `.items[].description` - an array of the the **description** values from each of the items in the items array.
+- `.users[0].username` - the username of the first item in the array users.
+
+```json
+let model = { foo: true, bar: 42, baz: "hello" };
+let bar = jsonQuery(model, '.bar', 43);
+// bar = 42
+```
+
+## jsonPatch(model, path, value) → object
+
+Patch a key in the model with the provided value.
+
+```json
+let model = { foo: true, bar: 42, baz: "hello" };
+let updated = jsonPatch(model, '.baz', 'hello world');
+// updated = { foo: true, bar: 42, baz: "hello world" }
+```
+
+## tokenizePath(path) → array
+
+This is used internally to parse paths, but it may be useful for some other purpose. There is no backward compatibility promise for this function however.