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syntax-json

v1.0.1

Published

Minimal JSON syntax highlighter. Single-pass, zero dependencies, <1KB.

Vulnerabilities

Powered byPowered by Snyk
  • 0High
  • 0Medium
  • 0Low

Links

Git

Maintainers

anvmeanvme

Keywords

jsonsyntaxhighlighthighlighterminimalcss-highlight-apizero-dependency

Readme

syntax-json

Minimal JSON syntax highlighter. Single-pass, zero dependencies, <1 KB.

  • < 600 bytes brotli, ~900 bytes minified
  • < 0.1 ms parse time — single-pass character scan
  • Zero dependencies
  • Zero DOM mutations — uses CSS Highlight API
  • Dark mode via prefers-color-scheme, Bootstrap, or CSS class
  • Auto-initializes — just add the script tag

Live Demo

Install

npm install syntax-json
import syntaxJSON from 'syntax-json';

CDN

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/syntaxjson.min.js" crossorigin="anonymous"></script>

Usage

<pre><code class="json">{
  "name": "example",
  "value": 42,
  "active": true
}</code></pre>

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/syntaxjson.min.js" crossorigin="anonymous"></script>

That's it. The script auto-highlights all <pre><code class="json"> elements on page load.

How It Works

  1. Single-pass character scanner identifies strings, numbers, and keywords
  2. Creates StaticRange objects for each token
  3. Registers ranges with the CSS Highlight API (CSS.highlights)
  4. Injects theme-aware styles via CSSStyleSheet

No innerHTML. No DOM mutations. No reflows.

Dark Mode

Auto-adapts via prefers-color-scheme. Force theme with:

<html data-bs-theme="dark">   <!-- Bootstrap 5.3 -->
<div class="dark">              <!-- CSS class -->

API

syntaxJSON(element)

Parse a <code> element and return highlight ranges.

const ranges = syntaxJSON(document.querySelector('code.json'));
// { s: [StaticRange...], n: [StaticRange...], k: [StaticRange...] }

| Key | Token | Light | Dark | |-----|-------|-------|------| | s | Strings | #22863a | #a5d6ff | | n | Numbers | #005cc5 | #79c0ff | | k | Keywords (true, false, null) | #d73a49 | #ff7b72 |

License

MIT