Verdict: JSON wins for data exchange — every API and language parses it natively, and its strict brackets leave no room for ambiguity. YAML wins for human-written configuration — cleaner to read, with comments. Payloads and APIs go JSON; hand-edited config goes YAML.
| Criterion | JSON | YAML |
|---|---|---|
| Primary use | APIs and data interchange | Config files (CI, Kubernetes, apps) |
| Readability | Noisy brackets and quotes | Clean, minimal, indentation-based |
| Comments | Not allowed by the standard | Supported with # |
| Parsing | Built into every language | Needs a YAML library |
| Strictness | Strict and unambiguous | Forgiving, but indentation errors bite |
| Best for | Machine-to-machine data | Human-maintained configuration |
Every tool below runs entirely in your browser — your files never leave your device.
Standard JSON forbids comments, which is why config often moves to YAML or JSONC/JSON5. If your tooling accepts JSONC, that is a middle ground — otherwise convert to YAML.
Effectively yes — valid JSON parses as YAML 1.2 in most parsers. That makes JSON-to-YAML conversion safe and mechanical.
Almost always tabs-for-indentation or a stray colon in an unquoted string. Use spaces only, quote strings containing colons or leading special characters, and validate after editing.
Yes — the linked converters run entirely in your browser, so API keys and config values never leave your device.