YAML to JSON Converter — YAML is the format you will find in Kubernetes manifests, GitHub Actions workflows, Ansible playbooks, Docker Compose files, and most modern configuration. It is more human-friendly than JSON but harder to read once it gets past a few levels of nesting.
Parsing runs locally in your browser. Your YAML never leaves the page.
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YAML to JSON Converterとは？
YAML is the format you will find in Kubernetes manifests, GitHub Actions workflows, Ansible playbooks, Docker Compose files, and most modern configuration. It is more human-friendly than JSON but harder to read once it gets past a few levels of nesting.
This tool takes YAML and renders it as pretty-printed JSON, so you can see the actual structure (objects, arrays, scalar values) at a glance. It also flags common YAML errors with the line and column where they occurred, so you can fix typos before committing.
使い方
-
Paste your YAML
Drop a YAML document into the input.
-
Read the JSON
The output updates as you type. Click any key in the tree preview to collapse the rest.
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Copy or download
Use Copy for the clipboard, or Download to save as a .json file.
使用例
Service manifest
A Kubernetes-style service definition as YAML, parsed to JSON.
apiVersion: v1
kind: Service
metadata:
name: web
spec:
ports:
- port: 80
targetPort: 8080 結果： { "apiVersion": "v1", "kind": "Service", "metadata": { "name": "web" }, "spec": { "ports": [{ "port": 80, "targetPort": 8080 }] } }
GitHub Actions workflow
A minimal CI workflow as YAML, parsed to JSON.
name: CI
on: [push]
jobs:
test:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- run: npm test 結果： { "name": "CI", "on": ["push"], "jobs": { "test": { "runs-on": "ubuntu-latest", "steps": [{"uses": "actions/checkout@v4"}, {"run": "npm test"}] } } }
よくある質問
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Last reviewed: 2026-09-25