HTML Preview Tool for Config Files
Preview HTML rendering in a sandboxed iframe. Free browser tool — no signup.
Quick Answer
Type or paste HTML to see it rendered live in a sandboxed preview area below the editor.
Preview renders below (sandboxed):
How to Use the HTML Preview Tool for Config Files
- Use the input area to provide your data.
- The tool processes it instantly in your browser.
- Copy or download the result.
Frequently Asked Questions
- Which config files work with this tool?
- Any JSON configuration file: package.json, tsconfig.json, .eslintrc.json, babel.config.json, VS Code settings, AWS CloudFormation templates, and more.
About This Tool
Configuration files are at the heart of modern software development — from package.json and tsconfig.json to VS Code settings and cloud infrastructure templates. This HTML Preview Tool for Config Files is tailored for processing HTML configuration files with the precision and care they require. Configuration files often contain comments (in formats that support them), version-specific settings, and carefully structured hierarchies that must be preserved during formatting. The tool processes these files while maintaining all data integrity, ensuring that indentation reveals the logical structure of configuration sections, nested settings, and conditional values. Whether you are cleaning up auto-generated configuration, merging settings from multiple sources, or preparing config files for documentation, this tool handles the task reliably.
What is HTML Preview Tool?
An HTML preview tool renders HTML code in a sandboxed iframe, giving you a live visual preview of how your markup will look in a browser. The preview is sandboxed for security — scripts are restricted to prevent malicious code execution. This is useful for quickly testing HTML snippets, email templates, CSS styling, and layout experiments without creating a full HTML file or setting up a development server. The preview updates as you type, providing immediate visual feedback. It is particularly valuable for email template development, where different HTML rendering engines require careful testing of markup and inline styles.
How to Use This Tool
- Type or paste HTML in the input area.
- See the live preview below.
- Edit and see changes immediately.
- The preview is sandboxed for security.
Common Use Cases
- Formatting package.json for readability
- Cleaning up tsconfig.json and eslint configs
- Processing VS Code settings.json files
- Normalizing docker compose JSON overrides
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