json-diff-kit
v1.0.30
Published
A better JSON differ & viewer.
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JSON Diff Kit
A better JSON differ & viewer library written in TypeScript. Try it out in the playground!
Install
You can install json-diff-kit
via various package managers.
# using npm
npm i json-diff-kit --save
# using yarn
yarn add json-diff-kit
# using pnpm
pnpm add json-diff-kit
Quick Start
To generate the diff data:
import { Differ } from 'json-diff-kit';
// or if you are using vue, you can import the differ only
import Differ from 'json-diff-kit/dist/differ';
// the two JS objects
const before = {
a: 1,
b: 2,
d: [1, 5, 4],
e: ['1', 2, { f: 3, g: null, h: [5], i: [] }, 9],
m: [],
q: 'JSON diff can\'t be possible',
r: 'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.',
s: 1024,
};
const after = {
b: 2,
c: 3,
d: [1, 3, 4, 6],
e: ['1', 2, 3, { f: 4, g: false, i: [7, 8] }, 10],
j: { k: 11, l: 12 },
m: [
{ n: 1, o: 2 },
{ p: 3 },
],
q: 'JSON diff is possible!',
r: 'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed quasi architecto beatae incididunt ut labore et dolore magna aliqua.',
s: '1024',
};
// all configs are optional
const differ = new Differ({
detectCircular: true, // default `true`
maxDepth: Infinity, // default `Infinity`
showModifications: true, // default `true`
arrayDiffMethod: 'lcs', // default `"normal"`, but `"lcs"` may be more useful
});
// you may want to use `useMemo` (for React) or `computed` (for Vue)
// to avoid redundant computations
const diff = differ.diff(before, after);
console.log(diff);
You can use your own component to visualize the diff
data, or use the built-in viewer:
import { Viewer } from 'json-diff-kit';
import type { DiffResult } from 'json-diff-kit';
import 'json-diff-kit/dist/viewer.css';
interface PageProps {
diff: [DiffResult[], DiffResult[]];
}
const Page: React.FC<PageProps> = props => {
return (
<Viewer
diff={props.diff} // required
indent={4} // default `2`
lineNumbers={true} // default `false`
highlightInlineDiff={true} // default `false`
inlineDiffOptions={{
mode: 'word', // default `"char"`, but `"word"` may be more useful
wordSeparator: ' ', // default `""`, but `" "` is more useful for sentences
}}
/>
);
};
The result is here:
Other Version of Viewer
Here is an experimental Vue version of the Viewer
component.
More Complex Usages
Please check the playground page, where you can adjust nearly all parameters and see the result.
CLI Tool
You can use the CLI tool to generate the diff data from two JSON files. Please install the package terminal-kit
before using it.
pnpm add terminal-kit # or make sure it's already installed in your project
# Compare two JSON files, output the diff data to the terminal.
# You can navigate it using keyboard like `less`.
jsondiff run path/to/before.json path/to/after.json
# Output the diff data to a file.
# Notice there will be no side-by-side view since it's not a TTY.
jsondiff run path/to/before.json path/to/after.json -o path/to/result.diff
# Use a custom configuration file and output the diff data to a file.
jsondiff run path/to/before.json path/to/after.json -c path/to/config.json -o path/to/result.diff
# Print the help message.
jsondiff --help
jsondiff run --help
Algorithm Details
Please refer to the article JSON Diff Kit: A Combination of Several Simple Algorithms.
Features & Roadmap
- [x] Provide a
Differ
class and aViewer
component - [x] Merge "remove & add" at the same place as a modification
- [x] Support inline diffing by word instead of by character
- [x] Generate code directly in the demo page (covered by playground)
- [x] Optimise
Viewer
performance by adding virtual scrolling - [x] Add CLI tool
- [x] Provide a Vue version of
Viewer
- [ ] Improve unit tests
License
MIT