YAML to JSON Converter

YAML is the default configuration format for a huge share of developer tooling: Docker Compose files, Kubernetes manifests, GitHub Actions and most other CI pipeline definitions, Ansible playbooks, and countless application config files. It's chosen over JSON in these contexts specifically because it supports comments and reads more like plain text — genuinely useful for hand-edited config, though that same flexibility is also where its sharper edges come from.

Almost always indentation. Unlike JSON, where whitespace is cosmetic and braces/brackets define structure explicitly, YAML uses indentation itself to define nesting — mixing tabs and spaces, or being off by even one space, changes what a block belongs to or breaks parsing outright. This is the single most common source of YAML errors, and this tool reports the exact line and column js-yaml's parser stopped at, rather than a generic "invalid" message, specifically to make that kind of mistake fast to find.

YAML supports anchors (&name) and aliases (*name) to reuse a block of content in more than one place, including merge keys (<<: *name) to mix a reused block into a mapping. JSON has no equivalent concept, so converting to JSON resolves every anchor/alias to its actual final value at the point it's used — the output is correct and complete, but the "this value is reused elsewhere" relationship itself doesn't survive the conversion. This is a one-way simplification specific to that one YAML feature, not a bug.

No. All parsing and conversion happens locally in your browser — nothing is uploaded, logged, or transmitted. This matters more than usual for this tool specifically, since config files often contain real hostnames, ports, and sometimes credentials.