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prismjs-fold-json

v1.0.9

Published

plugin for prism to fold json/js

Vulnerabilities

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

Links

Git

Maintainers

xyty007xyty007

Keywords

prismpluginfoldjsonjs

Readme

Prism.js JSON Folding Plugin

A Prism.js plugin that adds code folding support for JSON objects and arrays. Demo
The algorithm should work for any C-like language. JSON/JavaScript/Java are supported by default. You can add more languages by setting the PRISM_FOLD_HOOK_LANGUAGES environment variable.

How It Works

This plugin processes Prism tokens and wraps {} and [] blocks in <details> tags to enable folding functionality.

It implements two Prism hooks:

  1. after-tokenize handler: Identifies punctuation tokens ({ and [), converting the flat token list into nested structures for folding
  2. wrap handler: Adds <details> and <summary> tags before final HTML output

Key Differences from Similar Solutions

this implementation:

  • Inspired by prism-js-fold, uses semantic HTML <details> without JavaScript event handlers
  • Leverages Prism's low-level highlight function through hook integration, therefore works transparently with direct calls to Prism.highlight()
  • Processes tokens split by Prism's native parser instead of relying on regular expressions

Setup

Node.js Installation

Install via npm:

npm install prismjs-fold-json

Import after Prism:

const Prism = require('prismjs');
require('prismjs-fold-json');

// Example usage
const html = Prism.highlight(
  JSON.stringify({ a: [1, 2] }, null, 4),
  Prism.languages.json,
  "json"
);

Note: For Vue/React projects, import CSS in your entry file:

import 'prismjs-fold-json/main.css';

CDN Usage

<!DOCTYPE html>
<html lang="en">
<head>
    <link rel="stylesheet" 
          href="https://unpkg.com/[email protected]/themes/prism-coy.min.css">
    <!-- Required CSS -->
    <link rel="stylesheet" 
          href="https://unpkg.com/[email protected]/main.css">
</head>
<body>
    <script src="https://unpkg.com/[email protected]/components/prism-core.min.js"></script>
    <script src="https://unpkg.com/[email protected]/plugins/autoloader/prism-autoloader.min.js"></script>
    <!-- Plugin script (load after Prism) -->
    <script src="https://unpkg.com/[email protected]/index.js"></script>
</body>
</html>

Known Issues

Browser-specific <details> tag behavior:

  • Chromium ≥128: Creates new lines
  • Other browsers: Adds extra indentation spaces

The implementation handles these differences through adaptive logic. If issues persist, try setting the PRISM_IN_CHROME_LIKE environment variable with these values:
auto (default) | new | old | none