YAML to JSON Converter

What Is a YAML to JSON Converter?

YAML to JSON conversion is a daily task for DevOps engineers working with Kubernetes manifests, Docker Compose files, GitHub Actions workflows, and Ansible playbooks. YAML's human-readable indentation format is great for writing configuration, but many tools and APIs require JSON input. This converter handles YAML 1.2 syntax including nested structures, arrays, multi-line strings, and automatic type detection.

Example

YAML Input:

user:
  name: Alice
  age: 30
  roles:
    - admin
    - editor

JSON Output:

{"user":{"name":"Alice","age":30,"roles":["admin","editor"]}}

How to Use This Converter

Paste your YAML data into the input panel.
View the converted JSON output — it updates instantly.
Click Copy to copy the result to your clipboard.
Verify the output matches your expectations before using in production.

Developer Tips

YAML treats unquoted values like yes, no, on, off as booleans, not strings. A YAML config with country: no (meaning Norway) converts to {country: false} in JSON. Always quote ambiguous string values in YAML.
YAML supports anchors and aliases for reusing values. JSON has no equivalent - the converter must resolve all references into duplicated values, which can significantly increase file size.
YAML indentation errors are silent - a misindented key creates a different nesting structure than intended. JSON explicit braces make structure errors immediately visible. Always validate YAML structure before converting.

Related Converters

All conversions run entirely in your browser — no data is sent to any server. For the specification, see YAML Specification 1.2.2.

Frequently Asked Questions

Why convert YAML to JSON?

YAML configuration files (Docker Compose, Kubernetes, GitHub Actions, CI/CD pipelines) sometimes need to be consumed by JSON-only tools or APIs. Converting YAML to JSON also helps validate that your YAML is syntactically correct — if it converts cleanly, it parses correctly.

What YAML features are lost in JSON conversion?

JSON does not support comments, anchors/aliases, multi-line strings (block scalars), or custom tags. Comments are stripped, anchors are resolved to their values, and block scalars become regular strings with \n characters.

Is YAML a superset of JSON?

Yes — since YAML 1.2, all valid JSON is also valid YAML. However, the reverse is not true. YAML adds features like comments, anchors, and indentation-based structure that JSON lacks.

How does YAML handle data types differently than JSON?

YAML auto-detects types: 'yes' becomes boolean true, '1.5' becomes a float, '2024-01-01' becomes a date. JSON requires explicit syntax: true, 1.5, "2024-01-01". This auto-typing can cause bugs — 'no' in YAML becomes false, not the string "no".

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