Choose JSON for
- REST and web APIs
- Browser and JavaScript applications
- Strict data exchange
- Compact automated payloads
JSONversusYAML
JSON vs YAML: Which Format Should You Use?
Compare JSON and YAML for APIs, configuration files, CI/CD pipelines and human-readable data before choosing a format.
Quick decision
Choose JSON for APIs, strict machine exchange and broad library support. Choose YAML for human-edited configuration where readability matters.
Feature comparison
Feature
JSON
YAML
Primary strength
Predictable machine-readable structure
Readable configuration syntax
Comments
Not supported by the standard
Supported with # comments
Syntax
Braces, brackets and quoted keys
Indentation-based
Common usage
APIs, web apps and data exchange
DevOps and application configuration
Parsing risk
Usually explicit and consistent
Indentation and implicit types require care
Choose YAML for
- Kubernetes manifests
- CI/CD pipelines
- Docker Compose
- Human-maintained configuration
Related tools
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Frequently asked questions
Is YAML a replacement for JSON?
Not universally. YAML is convenient for human-edited configuration, while JSON remains a predictable choice for APIs, browsers and machine-generated data.
Does converting JSON to YAML change the data?
A careful conversion should preserve objects, arrays and scalar values, but date-like strings, large numbers, null values and special characters deserve verification because YAML parsers may apply implicit typing rules.
Which format is safer for automated APIs?
JSON is usually safer for public APIs because its syntax and data model are narrower and consistently supported. YAML is more often used for files maintained by people.
Why can valid YAML still fail in an application?
The file may be syntactically valid but violate the application's expected schema, field names, value types or indentation conventions. Validate against the target tool, not only a generic parser.