How to Convert YAML to JSON

YAML files are excellent for human configuration, but many program runtimes and tools (such as Node.js or Python) parse JSON much faster. Converting YAML structures to JSON is a common step in build and deployment pipelines.

In this guide, we'll look at how to translate YAML properties into standard JSON objects.

Whitespace Parsing

YAML relies on consistent indentation. If there are indent mismatches, parsers will reject the file or format the hierarchy incorrectly.

Input YAML:

app:
  port: 3000
  env: production

Output JSON:

{
  "app": {
    "port": 3000,
    "env": "production"
  }
}

Handling Boolean and Numeric Values

Standard YAML parsers automatically convert values like yes, no, true, and false to booleans, and formats unquoted numbers to numeric types in your output JSON.