Convert YAML files to any format

YAML shows up everywhere in modern software — Kubernetes manifests, GitHub Actions workflows, Docker Compose files, application config, CI/CD pipelines, and API specs. It's readable and easy to hand-edit, but almost every tool downstream of it expects something else: a JSON payload, an XML document, a spreadsheet, a config file in a different dialect, or a typed object in your codebase. That gap is exactly what YAMLTool closes. This is a free, online YAML converter that runs entirely in your browser, so you can convert YAML to JSON, XML, CSV, TOML, Properties, INI, TypeScript, JavaScript, Markdown, or HTML without installing anything, writing a script, or uploading a file anywhere.

Convert YAML to JSON online

YAML to JSON is the single most common conversion developers need, and it's also the simplest to get right — both formats describe the same tree of maps, lists, and scalars, just with different syntax. This YAML to JSON converter online tool preserves your data's original types (strings, numbers, booleans, and null) and pretty-prints the result so it's easy to diff or paste into another tool. If you'd rather do the yaml to json conversion in code, Python's PyYAML combined with the built-in json module handles it in a couple of lines — but for a one-off conversion, this free YAML to JSON converter online is usually faster than opening an editor.

Convert YAML to XML

YAML to XML is a less obvious mapping, since XML has no single standard way to represent a YAML list or an oddly-named key. This converter uses clear, documented conventions — list items repeat their parent tag, and invalid tag names get sanitized automatically — and calls out any assumptions it made in a conversion-notes panel. Whether you'd otherwise reach for PyYAML with xml.etree.ElementTree in Python, or SnakeYAML with Java's XML APIs, this tool gives you the same well-formed XML instantly, in the browser.

Convert YAML to TOML

YAML to TOML conversion comes up constantly when migrating configuration for Rust, Python (pyproject.toml), or any CLI tool that has adopted TOML's table-based syntax. Nested YAML mappings become [section.subsection] tables, and arrays of mappings become TOML's array-of-tables syntax automatically.

Convert YAML to CSV

YAML to CSV conversion works best when your YAML is a flat list of records — think a list of users, products, or log entries. The converter collects every key it sees across the whole list to build the header row, so records with slightly different fields still export cleanly instead of breaking the conversion. It's a direct browser-based alternative to writing a short Python script with PyYAML and the csv module.

Convert YAML to Properties

YAML to Properties conversion flattens nested YAML into the dot-notated key=value pairs used by Java .propertiesfiles and many .env-style loaders — the same shape you'd get from SnakeYAML plusjava.util.Properties in a Java project, produced here without setting one up.

Convert YAML to TypeScript and JavaScript

For developers working in a JS or TS codebase, YAML to TypeScript inference turns a config or fixture file into a ready-to-use interface or type alias, including nested object types and union types for arrays with mixed item shapes. YAML to JavaScript conversion goes one step further and outputs a complete export default object literal you can drop straight into a module — no runtime YAML parser required.

Convert YAML to Markdown and HTML tables

YAML to Markdown conversion turns a list of records into a GitHub-flavored Markdown table, ready to paste into a README or pull request.YAML to HTML conversion does the same thing as semantic, accessible HTML — a proper <table> with <thead> and<tbody> that you can preview instantly and paste into a page. One clarification worth making: this is a generic YAML-to-table converter, not a Swagger or OpenAPI documentation renderer — if you're trying to turn an OpenAPI spec into interactive API docs, a dedicated tool like Swagger UI or Redoc is built specifically for that job.

Why convert YAML online instead of writing a script?

For a repeated, automated conversion in a build pipeline, a script or library is still the right call. But for the far more common case — a one-off YAML to JSON conversion while debugging, checking what a Kubernetes manifest looks like as XML, or turning a quick YAML list into a CSV for a spreadsheet — opening a terminal, installing a package, and writing a script is a lot of overhead for a task that takes two seconds in a browser. That's the gap this site fills: every converter above works entirely client-side, supports both the .yaml and .yml extensions, and never uploads your file or pasted text anywhere, so it's just as safe to use on production config as it is on a toy example.

Every conversion tool on this site is free to use, with no account required and no artificial usage quota. Pick a format above, drop in your YAML, and get a correct, well-formatted result back immediately.