HTML to YAML Converter

Converting HTML to YAML parses the markup with the browser's built-in DOM parser and walks the resulting element tree to produce nested YAML keys that mirror the original hierarchy, turning tags, attributes, and text nodes into a hierarchical key-value structure.

Each HTML element becomes a YAML key, and its attributes, direct text content, and child elements nest beneath it in the same order they appear in the source, so the resulting YAML tree mirrors the document structure rather than flattening it. Repeated sibling elements, such as a list of li tags, become an array under their shared parent key.

Attributes can be included or omitted; when included, each one is nested under its element using a configurable prefix, "@" by default, so an element with class="main" produces a key named @class with the value "main". When an element carries both attributes or children and its own direct text, that text is stored under a separate key, "#text" by default, since a plain scalar value cannot hold both a string and nested keys at once.

Indentation defaults to two spaces per nesting level and is adjustable. Array style controls how repeated sibling elements render: block format lists one item per line with a dash prefix, while flow format uses inline bracketed notation. An element with no text content and no children can be rendered as an explicit null value, as an empty string, or omitted from the output entirely, matching whichever convention the target YAML schema expects.

HTML can be pasted directly or loaded from an .html, .htm, or .txt file, and the resulting YAML can be copied to the clipboard or downloaded as a .yaml file.

Transforming HTML into YAML opens up a range of workflows across web development, content management, configuration authoring, and data migration. Below are practical scenarios where this converter adds value.

• Static Site Generation: Extract the structure of an existing HTML page and convert it into a YAML data file that a static site generator such as Jekyll or Hugo can consume. Feed headings, paragraphs, and list items into a content model without manual retyping.
• CMS Migration: Pull HTML content from a legacy content management system export and reshape it into YAML records that match the schema of a new headless CMS. Map element names to content type fields during the import pipeline.
• Configuration Authoring: Convert an HTML form layout into a YAML specification that describes each field's type, label, and default value. Hand the YAML file to a form-rendering engine that dynamically builds the UI from the spec.
• API Documentation: Parse HTML tables that describe API endpoints, parameters, and response codes into YAML structures compatible with OpenAPI or AsyncAPI specification files. Reduce manual transcription errors when documenting RESTful services.
• Template Auditing: Convert email or landing-page HTML templates into YAML trees to inspect nesting depth, attribute usage, and element distribution. Compare two YAML snapshots with a diff tool to spot structural changes between template revisions.
• Accessibility Review: Flatten an HTML page into YAML to quickly scan which elements carry aria attributes, alt text, or role annotations. Filter the YAML output for attribute prefix keys to produce a focused accessibility checklist.
• Educational Reference: Demonstrate how a browser's DOM parser interprets raw HTML by showing the resulting tree in a human-readable YAML format. Students and instructors can compare malformed markup with its parsed output to learn how missing closing tags or misplaced elements are resolved.
• Test Fixture Creation: Generate YAML test fixtures from sample HTML responses returned by web scrapers or HTTP clients. Store the expected parsed structure alongside integration tests so assertions compare YAML snapshots instead of fragile string matches.