HTML Formatter for API Responses

About This Tool

Working with REST APIs, GraphQL endpoints, and webhooks means constantly processing HTML response data. Raw API responses are typically minified — stripped of all whitespace and line breaks to minimize payload size — making them virtually impossible to read without formatting. This tool transforms those compact responses into well-structured, readable output that reveals the data hierarchy and makes it easy to locate specific values. Paste a response from Postman, cURL, browser DevTools Network tab, or any API client, and instantly see the formatted result. The tool validates the response structure during processing, catching malformed responses that might cause subtle bugs in your application. For developers debugging production issues, this immediate visibility into API data structures is invaluable.

What is HTML Formatter?

An HTML formatter transforms unformatted or single-line HTML into cleanly indented markup with proper nesting, line breaks, and consistent indentation. It recognizes HTML elements, self-closing tags (br, img, input, etc.), and nesting levels to produce visually clear code structure. Properly formatted HTML is easier to read, debug, and maintain. It helps developers quickly identify nesting errors, missing closing tags, and structural issues. The formatter processes the HTML in a single pass, tracking indent levels as tags open and close, producing clean output that follows common HTML coding conventions.

How to Use This Tool

1. Paste your HTML.
2. Click Format HTML.
3. View properly indented output.
4. Copy the formatted code.

Common Use Cases

• Formatting raw API response bodies for debugging
• Processing webhook payloads for analysis
• Cleaning up GraphQL query responses
• Inspecting third-party API data structures

Explore More Variations