About the Config Converter
YAML, JSON, and TOML describe roughly the same data model, so converting between them is mostly mechanical — but the places where they disagree are exactly the places that break deployments. This converter translates between the three formats and shows the result immediately, so you can see what survived the trip.
Two things never survive. Comments are not part of any of these data models, so a YAML file rewritten as JSON and back loses every explanatory comment in it. YAML anchors and aliases are resolved during parsing, so a document that used an anchor to avoid repetition comes back with the repetition expanded inline. Neither is a bug, but both surprise people who expected a round trip.
Conversion runs entirely in your browser, which matters because these files are usually deployment configuration and frequently contain hostnames, credentials, or internal topology.
Frequently asked questions
Why did my YAML value change type after conversion?
Unquoted YAML scalars are type-inferred, and the inference is more aggressive than people expect. The word no becomes a boolean under YAML 1.1, a version string like 1.10 becomes the number 1.1 and loses the trailing zero, and a value like 08 can error as an invalid octal. Quote any scalar whose exact text matters — particularly versions, country codes, and anything that looks like a number but is really an identifier.
Does converting to JSON lose my comments?
Yes, always. JSON has no comment syntax and comments are not part of the parsed data model in the first place, so there is nothing to carry across. Convert in the direction that matters and keep the commented file as the source of truth — never treat a JSON round trip as a safe reformat of a documented YAML file.
What happens to YAML anchors and aliases?
They are resolved at parse time and disappear. A document using an anchor to define a block once and reference it three times converts to output with that block written out three times. The result is semantically identical and considerably longer, and any later edit now has to be made in three places.
Why does TOML reject my nested structure?
TOML is deliberately flatter than the others and expresses nesting through table headers rather than arbitrary indentation. Deeply nested or heterogeneous arrays that are natural in YAML often have no clean TOML equivalent. TOML suits flat application configuration; it is a poor target for something like a Kubernetes manifest.
Is JSON always valid YAML?
For YAML 1.2, essentially yes — the specification was explicitly aligned so that JSON is a subset. Under YAML 1.1 parsers, which are still widespread, there are edge cases around duplicate keys and certain number formats. Relying on the subset property is fine for hand inspection and unwise as a production assumption.
Need this managed for you, not just automated?
We're also a hands-on DevOps consultancy — Kubernetes, CI/CD, and cloud infrastructure.