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@hyperjump/json-pointer
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This is an implementation of RFC-6901 JSON Pointer. JSON Pointer is designed for referring to data values within a JSON document. It's designed to be URL friendly so it can be used as a URL fragment that points to a specific part of the JSON document.
Includes support for node.js (ES Modules, TypeScript) and browsers.
npm install @hyperjump/json-pointer
import * as JsonPointer from "@hyperjump/json-pointer";
const value = {
"foo": {
"bar": 42
}
};
// Construct pointers
const fooPointer = JsonPointer.append("foo", JsonPointer.nil); // "/foo"
const fooBarPointer = JsonPointer.append(fooPointer, "bar"); // "/foo/bar"
// Get a value from a pointer
const getFooBar = JsonPointer.get(fooBarPointer);
getFooBar(value); // 42
// Set a value from a pointer
// New value is returned without modifying the original
const setFooBar = JsonPointer.set(fooBarPointer);
setFooBar(value, 33); // { "foo": { "bar": 33 } }
// Assign a value from a pointer
// The original value is changed and no value is returned
const assignFooBar = JsonPointer.assign(fooBarPointer);
assignFooBar(value, 33); // { "foo": { "bar": 33 } }
// Unset a value from a pointer
// New value is returned without modifying the original
const unsetFooBar = JsonPointer.unset(fooBarPointer);
setFooBar(value); // { "foo": {} }
// Delete a value from a pointer
// The original value is changed and no value is returned
const deleteFooBar = JsonPointer.remove(fooBarPointer);
deleteFooBar(value); // { "foo": {} }
nil: ""
The empty pointer.
pointerSegments: (pointer: string) => Generator<string>
An iterator for the segments of a JSON Pointer that handles escaping.
append: (segment: string, pointer: string) => string
Append a segment to a JSON Pointer.
get: (pointer: string, subject: any) => any
Use a JSON Pointer to get a value. This function can be curried.
set: (pointer: string, subject: any, value: any) => any
Immutably set a value using a JSON Pointer. Returns a new version of
subject
with the value set. The original subject
is not changed, but the
value isn't entirely cloned. Values that aren't changed will point to
the same value as the original. This function can be curried.
assign: (pointer: string, subject: any, value: any) => void
Mutate a value using a JSON Pointer. This function can be curried.
unset: (pointer: string, subject: any) => any
Immutably delete a value using a JSON Pointer. Returns a new version of
subject
without the value. The original subject
is not changed, but the
value isn't entirely cloned. Values that aren't changed will point to the
same value as the original. This function can be curried.
remove: (pointer: string, subject: any) => void
Delete a value using a JSON Pointer. This function can be curried.
Run the tests
npm test
Run the tests with a continuous test runner
npm test -- --watch
FAQs
An RFC-6901 JSON Pointer implementation
The npm package @hyperjump/json-pointer receives a total of 22,214 weekly downloads. As such, @hyperjump/json-pointer popularity was classified as popular.
We found that @hyperjump/json-pointer demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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