What is Code Formatter & Validator?
Ultitools Code Formatter & Validator is a unified dual-pane browser IDE for beautifying, minifying, and syntax-validating JSON, JavaScript, TypeScript, HTML, CSS, and Markdown. It uses in-memory Prettier AST engines with zero data transmission to external servers.
How to Use Code Formatter & Validator in 3 Simple Steps
No software installation, registration, or cloud file upload required.
Paste or Upload Code
Paste code snippets or drag text files into the left editor pane.
Format & Validate
Select your language, indentation preferences, and run the Prettier formatter.
Inspect & Copy
Review highlighted syntax errors, copy beautified output, or export to file.
Technical Specifications & Quality Architecture
Machine-readable specifications verified under our Studio Master Quality Standard.
| Specification Property | Engine Configuration / Standard |
|---|---|
| Formatting Engine | In-Browser Prettier AST Engine |
| Languages | JSON, JavaScript, TypeScript, HTML, CSS, Markdown |
| Validation | Instant Line/Column Syntax Error Reporting |
| Indentation | 2-space, 4-space, tabs, and compact minification |
| Privacy | 100% Private Client-Side Sandbox |
| Studio Developer | Aug27 Studio |
Frequently Asked Questions
Clear, direct answers regarding privacy, performance, and features.
Yes. Formatting runs 100% inside your browser using client-side Prettier. No code is ever sent to any remote server or logged.
It supports JSON, JavaScript, TypeScript, HTML, CSS, SCSS, Markdown, and YAML with custom indentation settings.
Yes. The AST parser flags exact line-and-column errors, missing brackets, unclosed strings, and malformed syntax tokens.