Edit and View YAML is a small browser-side workspace for people who need to write configuration and inspect the same document at the same time. The left side is the editable YAML source; the right side renders a syntax-colored view using the same lightweight browser-side highlighting approach used by the YAML tool family. The interface is deliberately simple: type, review structure, validate when needed, and copy or download the source.
The live preview is not a replacement for validation. A YAML document can be highlighted even when it contains a syntax error because syntax coloring is a visual operation. The Validate button therefore runs the supported parser separately and reports success or a line/column error. Keeping the two views separate is useful while learning YAML: you can see what the text looks like while also learning which indentation or mapping change makes it parse successfully.
Load Sample gives a representative configuration containing nested objects, sequences, comments, different scalar types, and a small inline collection. It is intentionally more useful than a two-line hello-world example because it demonstrates the forms that frequently appear in application settings and deployment files. Clear empties the editor and preview so you can start a new document without stale state.
The statistics row is designed as a quick orientation aid. It reports line count and character count for the source, and after validation it reports structural counts such as keys, arrays, and scalar values. These are not a schema check and should not be interpreted as proof that a deployment file is correct. They simply confirm that the parser saw the broad shape you expected.
Copy source copies the raw YAML, which is the form you normally want to paste into another editor or configuration system. Download source writes the same raw YAML to a local .yaml file. The preview itself is not downloaded as a rendered HTML snapshot because the tool is positioned as an editor/viewer rather than a screenshot exporter. This keeps the action names and results unambiguous.
The editor treats user input as untrusted text. Preview HTML is generated only after escaping source characters, and the implementation does not use eval or inject pasted content as executable markup. No runtime package or external API is needed. That makes the tool useful for internal configuration snippets where keeping the text within the current browser context is preferable to uploading it to a third-party editor.
For beginners, the workflow offers a practical way to learn indentation. Start with the sample, change one indentation level, and press Validate. The resulting error location shows how YAML structure depends on leading spaces. Then restore the sample and experiment with lists, nested mappings, strings that look like numbers, and comments. This is more instructive than memorizing isolated syntax rules because the editor lets you immediately observe the structural effect of each change.
For experienced developers, the tool is useful for quick inspection of small configuration fragments. It is not designed to compete with a full IDE and intentionally omits project-wide schema completion, file trees, version control, and language-server features. The scope is a focused, dependency-free YAML scratchpad that works directly in the page.
Large files are possible within browser limits, but the preview is regenerated from the text as it changes, so very large documents can become less responsive. For a massive production manifest, use a dedicated editor or command-line validator and use this tool for smaller excerpts, demonstrations, and review snippets. The implementation makes that trade-off explicit rather than claiming unlimited editor performance.
A productive learning exercise is to make one controlled change at a time. Add a nested key, move a list item, quote a scalar, or change a boolean, then validate. This lets you connect indentation and scalar spelling with parser behavior. For editing real configuration, keep the original file in your normal version-control workflow and use this page for focused inspection or quick corrections. The browser editor is deliberately lightweight, so the file remains understandable without editor-specific metadata or hidden state. For a repeatable review, keep the original file outside the page and use this editor as a disposable workspace; that way a refresh or accidental clear does not become the only copy of an important configuration document.