pretty-print-json
TypeScript icon, indicating that this package has built-in type declarations

3.0.0 • Public • Published

pretty-print-json

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Pretty-print JSON data into HTML to indent and colorize (written in functional TypeScript)

License:MIT npm Size Hits Build

Screenshot

A) Try It Out

Interactive online tool to format JSON:
https://pretty-print-json.js.org

B) Setup

1. Web browser

Load from the jsdelivr.com CDN:

<link rel=stylesheet href=https://cdn.jsdelivr.net/npm/pretty-print-json@2.1/dist/css/pretty-print-json.css>
...
<script src=https://cdn.jsdelivr.net/npm/pretty-print-json@2.1/dist/pretty-print-json.min.js></script>

The minified JS file is 2 KB.

For dark mode, replace pretty-print-json.css with pretty-print-json.dark-mode.css in the <link> tag.

Or to automatically sense dark mode based on the prefers-color-scheme CSS media feature, use pretty-print-json.prefers.css instead.

2. Node.js server

Install package for node:

$ npm install pretty-print-json

Import into your application:

import { prettyPrintJson } from 'pretty-print-json';

C) Usage

1. API

const html = prettyPrintJson.toHtml(data, options?);

2. Example

HTML:
<pre id=account class=json-container></pre>
JavaScript:

Pass data into prettyPrintJson.toHtml(data, options) and display the results.

const data = { active: true, mode: '🚃', codes: [48348, 28923, 39080], city: 'London' };
const elem = document.getElementById('account');
elem.innerHTML = prettyPrintJson.toHtml(data);

3. Options

Name (key) Type Default Description
indent integer 3 Number of spaces for indentation.
lineNumbers boolean false Wrap HTML in an <ol> tag to support line numbers.*
linkUrls boolean true Create anchor tags for URLs.
linksNewTab boolean true Add a target=_blank attribute setting to anchor tags.
quoteKeys boolean false Always double quote key names.
trailingCommas boolean true Append a comma after the last item in arrays and objects.

*When setting lineNumbers to true, do not use the <pre> tag as the white-space: pre; styling is applied to each line (<li>).

Screenshot

D) TypeScript Declarations

See the TypeScript declarations at the top of the pretty-print-json.ts file.

Customize the output of the function prettyPrintJson.toHtml(data: unknown, options?: FormatOptions) using the options parameter.

The options parameter is a FormatOptions object:

type FormatOptions = {
   indent?:         number,   //number of spaces for indentation
   lineNumbers?:    boolean,  //wrap HTML in an <ol> tag to support line numbers
   linkUrls?:       boolean,  //create anchor tags for URLs
   linksNewTab?:    boolean,  //add a target=_blank attribute setting to anchor tags
   quoteKeys?:      boolean,  //always double quote key names
   trailingCommas?: boolean,  //append a comma after the last item in arrays and objects
   };

Example TypeScript usage with explicit types:

import { prettyPrintJson, FormatOptions } from 'pretty-print-json';

const data = { active: true, mode: '🚃', codes: [48348, 28923, 39080], city: 'London' };
const options: FormatOptions = { linkUrls: true };
const html: string = prettyPrintJson.toHtml(data, options);

E) Build Environment

Check out the runScriptsConfig section in package.json for an interesting approach to organizing build tasks.

CLI Build Tools for package.json

  • 🎋 add-dist-headerPrepend a one-line banner comment (with license notice) to distribution files
  • 📄 copy-file-utilCopy or rename a file with optional package version number
  • 📂 copy-folder-utilRecursively copy files from one folder to another folder
  • 🪺 recursive-execRun a command on each file in a folder and its subfolders
  • 🔍 replacer-utilFind and replace strings or template outputs in text files
  • 🔢 rev-web-assetsRevision web asset filenames with cache busting content hash fingerprints
  • 🚆 run-scripts-utilOrganize npm package.json scripts into named groups of easy to manage commands
  • 🚦 w3c-html-validatorCheck the markup validity of HTML files using the W3C validator


To see some example HTML results, run npm install, npm test, and then node spec/examples.js.

Feel free to submit questions at:
github.com/center-key/pretty-print-json/issues

MIT License | Blog post

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npm i pretty-print-json

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Version

3.0.0

License

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  • dpilafian