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YAML vs JSON: Which Should You Use?

Compare YAML and JSON for configuration files, APIs, and data serialization. Learn when to choose each format.

March 8, 2024·6 min read

Overview

Both YAML and JSON are popular data formats, but they serve different purposes and have different strengths.

JSON Advantages

  • Universal support - Every language has a JSON parser
  • Strict syntax - Less ambiguous, easier to validate
  • API standard - REST APIs almost always use JSON
  • JavaScript native - Direct use in browser/Node.js

YAML Advantages

  • Human readable - Much easier to read and write by hand
  • Comments supported - # This is a comment
  • Multi-line strings - Easy block scalars
  • No brackets - Cleaner for config files

Same Data, Different Format

JSON:

{
  "database": {
    "host": "localhost",
    "port": 5432,
    "name": "mydb"
  }
}

YAML:

database:
  host: localhost
  port: 5432
  name: mydb

When to Use Each

  • API responses → JSON
  • Config files (docker-compose, Kubernetes, CI/CD) → YAML
  • Data storage → JSON
  • Human-edited files → YAML

Convert between formats: JSON to YAML | YAML to JSON

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