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JSON ⇔ YAML Converter

Convert and format between JSON and YAML. Choose indentation, view errors, copy and download.

Last updated: 2026/10/16 Developer Feedback & bug reports
Input

How to Use

1

Enter Data

Paste your JSON or YAML into the input box — config files or API responses work as-is.

2

Choose Direction

Click "JSON → YAML" or "YAML → JSON" and the formatted result appears in the output box.

3

Use the Result

Copy to clipboard, or download the result as a .yaml / .json file.

About the JSON ⇔ YAML Converter

A web tool that converts between JSON (JavaScript Object Notation) and YAML (YAML Ain't Markup Language). It bridges YAML-heavy workflows such as Kubernetes, Docker Compose, and CI/CD with JSON, the dominant format for APIs. All processing happens entirely in your browser, so your input is never sent to any server — even sensitive config files stay private.

Features

  • Two-way ConversionJSON→YAML and YAML→JSON, both with a single click.
  • Indent OptionsPick 2 or 4 spaces to match your team conventions.
  • Syntax ErrorsInvalid input shows a clear error so you can fix it fast.
  • Privacy ProtectedPowered by js-yaml in your browser. Data is never sent to servers.

Use Cases

  • Edit Kubernetes manifests and Docker Compose YAML
  • Review GitHub Actions and CI/CD config files
  • Convert API responses (JSON) into readable YAML
  • Standardize config formatting and readability
  • Convert YAML config into JSON for programmatic use

FAQ

Is the JSON ⇔ YAML converter free?
Yes, it is completely free. No registration or installation required.
Is my data sent to a server?
No. All conversion runs locally in your browser (js-yaml) and is never sent or stored externally, so even sensitive config files are safe.
Are YAML comments preserved after conversion?
No. Comments (lines starting with #) are lost when converting YAML to JSON, because JSON has no comment syntax. Keep important notes outside of comments.
Can I change the indentation?
Yes. Choose 2 or 4 spaces for YAML output; the same setting applies to JSON output.
What causes a "syntax error"?
For JSON: trailing commas, single quotes, or comments. For YAML: misaligned indentation, tab characters, or a missing space after a colon. Use the error message to locate the issue.
Can it convert large files?
Yes, within browser memory limits. Files up to several MB are usually handled without problems.

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Related Guides

What Is JSON? A Beginner Guide to Syntax, Writing, and Common Errors Learn what JSON is from the ground up: objects and arrays, the data types you can use, common syntax errors like trailing commas, and practical uses such as formatting, validation, YAML conversion, and diffing. What Is XML? Structure, How It Differs From HTML, Uses, and JSON Comparison Learn what XML is from the ground up: a markup language that expresses hierarchy with tags, the structure of elements, attributes, and text, the well-formed rules, how it differs from HTML, uses such as configuration, data exchange, RSS, and SVG, and a comparison with JSON. JSON vs XML vs YAML: Differences, Syntax, Types, and When to Use Each A clear comparison of JSON, XML, and YAML: their syntax, readability, comment support, and handling of types, plus which fits config files, data exchange, and APIs, how to convert between them, and a simple guide to choosing one.