YAML to JSON converter

YAML is the configuration language of Kubernetes, Docker Compose, GitHub Actions, GitLab CI and Ansible. Under the hood, YAML is a superset of JSON, and many tools convert it to JSON before using it. Converting YAML to JSON shows you exactly how a parser interprets your file, which is the quickest way to debug indentation and type problems.

How to use it

1. Paste YAML.
2. Read the JSON output, which updates live, and any parse errors.

Example

Input:

defaults: &defaults
  retries: 3
  timeout: 30s
service:
  <<: *defaults
  name: api
  ports: [80, 443]
  description: |
    Public API
    behind the load balancer

Output (with single quotes here):

{ 'defaults': { 'retries': 3, 'timeout': '30s' },
  'service': { 'retries': 3, 'timeout': '30s', 'name': 'api',
    'ports': [80, 443], 'description': 'Public API\nbehind the load balancer\n' } }

The anchor &defaults and merge key <<: *defaults are expanded, and the block scalar | keeps line breaks.

YAML gotchas the JSON reveals

• The Norway problem: in YAML 1.1 parsers, unquoted NO, yes, on and off become booleans. Quote country codes and flags.
• Version numbers: version: 1.10 becomes the number 1.1. Quote it.
• Leading zeros: zip: 01234 may be read as an octal or plain number.
• Indentation: a list item indented one space too few moves to a different parent.
• Tabs are not allowed for indentation.