Pasting an OpenAPI / k8s / docker-compose YAML into a tool that needs JSON. Converting an API response (JSON) into YAML for a config file. Auditing a YAML file's actual structure when ambiguous indentation makes parentage unclear.

The "Norway problem". YAML 1.1 coerced NO , YES , ON , OFF into booleans. YAML 1.2 doesn't, but downstream parsers may. Quote ambiguous strings to be safe. Multi-document YAML ( --- separators) — only the first document is converted. Custom tags ( !!python/object , !Ref , etc.) violate strict YAML 1.2. CloudFormation YAML and PyYAML pickle dumps will fail; clean tags first. Anchors and aliases get expanded on YAML→JSON. JSON has no references, so *ref nodes inline. Round-tripping gives a value-equivalent but textually-larger YAML. Numbers vs strings. Unquoted YAML 3.14 is a float; "3.14" is a string.

YAML ↔ JSON Konverter

Konvertiere zwischen YAML und JSON in beide Richtungen. Für Kubernetes-Manifeste, CI-Configs und OpenAPI-Specs.

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What is this for?

YAML and JSON describe the same things — nested maps, lists, primitives — but trade off readability vs strictness. YAML is friendlier for humans (Kubernetes manifests, GitHub Actions, OpenAPI, most CI configs); JSON is what APIs and machine-readable formats ship. This converter flips between them losslessly for the structures both can express. YAML uses js-yaml (YAML 1.2); JSON uses the native API. Both directions run in your browser.

When to use it

Pasting an OpenAPI / k8s / docker-compose YAML into a tool that needs JSON.
Converting an API response (JSON) into YAML for a config file.
Auditing a YAML file's actual structure when ambiguous indentation makes parentage unclear.

Common gotchas

The "Norway problem". YAML 1.1 coerced NO, YES, ON, OFF into booleans. YAML 1.2 doesn't, but downstream parsers may. Quote ambiguous strings to be safe.
Multi-document YAML (--- separators) — only the first document is converted.
Custom tags (!!python/object, !Ref, etc.) violate strict YAML 1.2. CloudFormation YAML and PyYAML pickle dumps will fail; clean tags first.
Anchors and aliases get expanded on YAML→JSON. JSON has no references, so *ref nodes inline. Round-tripping gives a value-equivalent but textually-larger YAML.
Numbers vs strings. Unquoted YAML 3.14 is a float; "3.14" is a string.