About this tool

JSON to YAML Converter

Convert JSON objects and arrays into readable YAML.

The JSON to YAML Converter rewrites a JSON object or array as block-style YAML, using two spaces per nesting level and quoting only the strings that would otherwise be misread by a YAML parser. Values that contain characters like a colon, hash, dash or brace, or that begin or end with a space, are wrapped in double quotes; numbers, booleans and null are left bare. It is for anyone hand-editing a config that wants YAML but whose source of truth arrived as JSON.

How to use JSON to YAML Converter

1. 1

   Open JSON to YAML Converter on AltFTool — it loads instantly in your browser.

2. 2

   Paste your code or data sample into the workspace.

3. 3

   Pick the format, conversion, or analysis you need.

4. 4

   Copy the polished result straight back into your project.

Why use JSON to YAML Converter

• Quotes only where it matters

  Strings containing YAML-significant characters or edge whitespace are quoted; everything else stays unquoted and readable.

• Block style, not flow style

  Nested objects and lists are expanded across lines with two-space indents rather than collapsed into inline braces and brackets.

• Errors surface as you type

  The conversion re-runs on every keystroke and shows the JSON parser's own message the moment the input stops being valid.

Common use cases

• You exported a settings object as JSON and need it as YAML to drop into a docker-compose, GitHub Actions or Kubernetes manifest.
• A colleague pasted a JSON API example into a ticket and your docs use YAML code blocks, so you need the same data in the other notation.
• You are checking whether a string in your data — a timestamp, a version range, a value starting with a dash — needs quoting before it breaks the YAML parser.

Frequently asked questions