# Svelte Diff vs diff2html Git-Patch HTML Generator vs Reactive Svelte 5 Component ## Overview diff2html turns unified diff text — git patches — into polished, GitHub-style side-by-side or line-by-line HTML. It is the right tool for visualizing patches, and the wrong shape for comparing two strings inside a Svelte app: it needs pre-generated diff text as input and renders via an HTML string or imperative DOM wrapper plus a global stylesheet, rather than a Svelte component. - **Svelte Diff site:** https://diff.svelte.page - **Svelte Diff npm:** https://www.npmjs.com/package/%40humanspeak%2Fsvelte-diff - **Svelte Diff slug:** svelte-diff - **Category:** Git diff HTML renderer - **Approach:** Convert unified diff / patch text into pre-styled HTML - **Website:** https://diff2html.xyz - **GitHub:** https://github.com/rtfpessoa/diff2html - **npm:** https://www.npmjs.com/package/diff2html ## Feature comparison | Feature | @humanspeak/svelte-diff | diff2html | Notes | | --- | --- | --- | --- | | Input | Two plain strings | Unified diff / git patch text | To compare two strings with diff2html you must generate patch text first (e.g. jsdiff createPatch) | | Ready-to-use Svelte component | Svelte 5 component | No — HTML generator | diff2html generates or inserts HTML; it is not a Svelte component | | Inline character-level diff | Yes | Within changed lines | | | Side-by-side file view | No | Yes | | | Git patch awareness (files, hunks, headers) | No | Yes | | | Custom rendering | Svelte snippets | Template + CSS overrides | | | Output | Real DOM via Svelte | HTML string or imperative DOM injection + stylesheet | | | Expected patterns (ignore dynamic regions) | Named regex capture groups | No | | | Semantic cleanup | cleanupSemantic prop | No | | | TypeScript support | Yes | Yes | | ## Svelte Diff strengths - Ready-to-use Svelte 5 component — pass two strings, get a rendered diff - Svelte 5 runes-native — reactive to prop changes, no manual recompute - Semantic and efficiency cleanup built in (readable diffs, not character noise) - Expected patterns — mark dynamic regions (dates, names, versions) as "expected" with named regex capture groups instead of showing them as diffs - Full rendering control via Svelte snippets (remove / insert / equal / expected / lineBreak) or plain CSS classes - TypeScript-first with typed props, timing stats, and diff results - Configurable timeout guard for large text comparisons ## diff2html strengths - Polished GitHub-style diff UI out of the box - Side-by-side and line-by-line view modes - Understands real git patches — files, hunks, renames - Framework-agnostic and maintained, with less frequent releases ## Svelte Diff limitations - Smaller community (newer project) - Character-level diffing with cleanup — no word / line / sentence granularity modes - A Svelte component — not for diffing data in Node scripts or CLIs - No side-by-side or per-file patch view ## diff2html limitations - Requires unified diff text as input — comparing two strings means generating a patch first - Renders via an HTML string or imperative DOM wrapper and a global stylesheet, not components - Customization is CSS overrides, not your own markup - Heavier payload than a single-purpose component ## Verdict Choose diff2html to display git patches — PR-style file views with side-by-side layout. Choose @humanspeak/svelte-diff to compare two strings inline in a Svelte app, without generating patch text as an intermediate step. ## Keywords diff2html svelte, svelte git diff view, diff2html vs svelte-diff, svelte diff viewer, svelte side by side diff