JSON → YAML
Convert JSON to YAML online
Paste JSON, get clean YAML in one click. Free, private, in-browser converter with support for nested objects, arrays, anchors, and custom indentation.
Last updated:
[object Object]
[object Object]
[object Object]
Open the JSON → YAML converter
Runs entirely in your browser. No signup, no upload.
Launch converter →Example: JSON → YAML
Input (.json)
{
"name": "allonetools",
"version": "1.0.0",
"features": ["formatter", "validator", "converter"],
"deploy": { "env": "production", "replicas": 3 }
}Output (.yaml)
name: allonetools
version: 1.0.0
features:
- formatter
- validator
- converter
deploy:
env: production
replicas: 3How to convert JSON to YAML manually
Prefer scripting this in a pipeline? Here are the most common CLI and library approaches.
Install a CLI locally
npm install -g js-yaml
# or
pip install pyyamlConvert a file with Node.js
import yaml from 'js-yaml';
import fs from 'node:fs';
const data = JSON.parse(fs.readFileSync('in.json', 'utf8'));
fs.writeFileSync('out.yaml', yaml.dump(data));Convert a file with Python
import json, yaml
with open('in.json') as f: data = json.load(f)
with open('out.yaml', 'w') as f: yaml.safe_dump(data, f, sort_keys=False)Frequently asked questions
Is my JSON sent to a server?
No. The conversion runs entirely in your browser using client-side JavaScript. The page never uploads your JSON anywhere — you can verify this by opening DevTools → Network tab and watching that no request fires when you click Convert.
Why does my YAML look different from what the online converter produced?
YAML has multiple valid representations for the same data — block style vs flow style, single vs double quotes, anchors vs repeated values. Our converter uses block style with double-quoted strings where ambiguity would otherwise arise (e.g. strings that look like booleans). Both outputs are semantically identical.
Does it handle JSON with comments (JSONC)?
No, because strict JSON doesn't allow comments. If you have a `tsconfig.json` or `.vscode/settings.json` with `//` comments, strip them first — or paste the result into our JSON Formatter, which tolerates JSONC and emits clean JSON you can then feed here.
What's the file size limit?
There's no hard limit — we've tested the converter with 50 MB JSON files. Performance depends on your device. On a modern laptop, a 10 MB JSON file converts in ~300 ms.
Can I convert YAML back to JSON?
Yes. Use our dedicated /convert/yaml-to-json/ page, or the same underlying JSON Converter tool with the input/output toggles swapped.