A JavaScript text differencing implementation. Try it out in the online demo.

Based on the algorithm proposed in "An O(ND) Difference Algorithm and its Variations" (Myers, 1986).

npm install diff --save

In an environment where you can use imports, everything you need can be imported directly from diff. e.g.

ESM:

import {diffChars, createPatch} from 'diff';

CommonJS

const {diffChars, createPatch} = require('diff');

If you want to serve jsdiff to a web page without using a module system, you can use dist/diff.js or dist/diff.min.js. These create a global called Diff that contains the entire JsDiff API as its properties.

jsdiff's diff functions all take an old text and a new text and perform three steps:

1. Split both texts into arrays of "tokens". What constitutes a token varies; in diffChars, each character is a token, while in diffLines, each line is a token.

2. Find the smallest set of single-token insertions and