JSON to YAML Converter

Convert JSON data into readable, indentation-based YAML. Free, instant, and no signup required.

From

→

Input (JSON)

Output (YAML)

About JSON to YAML conversion

JSON is the format most HTTP APIs speak by default — compact, ubiquitous in JavaScript environments, and readable by virtually every language's standard library, though it has no comment syntax and no native date type. YAML is the format of choice for configuration — Kubernetes manifests, Docker Compose, GitHub Actions, Ansible playbooks — it supports comments and multi-document files that JSON doesn’t.

This is close to a lossless round-trip — YAML is a superset of JSON’s data model, so every JSON value maps directly onto a YAML value. The visible difference is indentation-based block style replacing JSON’s braces, brackets, and commas.

How to convert JSON to YAML

Paste your JSON into the left editor, or click sample above it to try example data.
Click Convert. The YAML result appears on the right instantly.
Click copy to copy the result, or download to save it as a file.

Example

Input (JSON):

{
  "name": "Ada Lovelace",
  "role": "Mathematician",
  "active": true,
  "skills": ["math", "programming"]
}

Output (YAML):

name: Ada Lovelace
role: Mathematician
active: true
skills:
  - math
  - programming

Frequently asked questions

Does converting JSON to YAML lose anything? Essentially no — YAML is a superset of JSON's data model, so every JSON value (object, array, string, number, boolean, null) maps directly to an equivalent YAML value. The only real change is visual: indentation-based blocks instead of braces and commas.

Do I need to create an account? No. There's no signup, login, or account required — paste your data and click Convert.

Is there a file size limit? There's no hard-coded limit, but very large inputs (multi-megabyte files) can slow down or briefly freeze the tab while converting. For big files, converting in smaller chunks works better.

Why did my conversion fail? Check the status line under the Convert button — it reports the exact line and column where the parser stopped, and the input editor highlights that line in red so you can jump straight to it.