Beautify HTML code with proper indentation using js-beautify.
Paste your minified JSON, messy code, or messy CSS/HTML into the formatter. It works with any supported format — objects, arrays, nested data, stylesheets, markup.
The tool instantly prettifies your content with proper indentation. Syntax errors are highlighted in red with line numbers so you can pinpoint exactly where something is broken.
For JSON, expand and collapse nested objects and arrays. Click any value to copy it. The tree view makes navigating large data structures easy.
Use the minify button to compress content back to a single line. The validate button checks syntax without reformatting — useful for quick sanity checks.
The HTML Beautifier is part of LaiUse's growing collection of developer tools, programming, code formatter, json tools, regex. Like every tool on LaiUse, it runs entirely in your browser — meaning your data, files, and inputs stay on your device throughout the entire process.
LaiUse offers Developer tools alongside json formatter, json path query, cron expression parser. The entire platform is free to use with no signup required, making it a popular choice for developers, designers, and everyday users who need a quick tool without the overhead of a SaaS subscription.
Whether you need the html beautifier for a one-off task or as part of your regular workflow, LaiUse is designed to be fast, reliable, and private. Bookmark this page to come back anytime, or explore the rest of the Developer category for related tools.
No. The JSON formatter runs entirely in your browser. Your data stays on your device, making it safe to format sensitive API responses or configuration files.
Full JSON spec compliance including nested objects, arrays, numbers, strings, booleans, null, escape sequences, and UTF-8 unicode characters.
Yes. The tool handles JSON files up to several megabytes. For files over 10MB, you may experience a slight delay depending on your device.