free_tool
YAML to JSON Converter
Paste YAML and read it back as JSON, or flip the toggle and go the other way. The conversion is live, the JSON is pretty-printed, and a parse error shows you the line instead of failing silently. It runs in your browser, so nothing you paste leaves the page.
Config drift between YAML manifests and JSON APIs is where small typos turn into 2am incidents. I review the schemas, CI checks and defaults so your config is validated before it ships, not after it breaks.
Tighten up your config: book a callFull YAML 1.2: nested maps, sequences, anchors, multi-line scalars and typed values all round-trip. JSON output is 2-space indented. Everything is parsed locally in your browser.
same_data_two_shapes
One source of truth, two formats
YAML reads well for humans and config files; JSON is what most APIs and tools actually consume. You end up translating between the two constantly, and a single mis-indented line or an unquoted yes read as a boolean is enough to break a deploy.
Converting both ways side by side makes those surprises obvious before they ship. Watch how on, 3.0 and null come across, confirm the nesting is what you meant, then copy the result straight into your manifest or request body.
faq
Questions & answers
- How do I convert YAML to JSON online?
- Paste your YAML and the tool parses it and shows the equivalent JSON live as you type. It converts in both directions, so you can paste JSON to get YAML back, and any parse error is shown clearly so you can fix the input.
- Does it support full YAML 1.2, including anchors and multi-line strings?
- Yes. It uses the yaml library, which implements the full YAML 1.2 spec, so anchors and aliases, block and folded multi-line scalars, and the standard tag set all parse correctly rather than tripping up a simplified converter.
- Why is my YAML invalid?
- The most common causes are tabs used for indentation, which YAML forbids in favor of spaces, and inconsistent indentation levels within a block. A colon without a following space, or an unquoted value that contains a special character, will also fail. The error message points at where the parser gave up so you can correct that line.
- Can it convert JSON back to YAML?
- Yes. Conversion is bidirectional, so paste JSON and it emits the equivalent YAML. Because all valid JSON is valid YAML, this direction is reliable and is handy for turning an API response or config into more readable YAML.
- Does it preserve my YAML comments?
- No. Comments are dropped on a round-trip, because JSON has no concept of comments, so anything after a # is lost once the document is converted. If your comments matter, keep the original YAML rather than relying on the converted output.
- Is my config uploaded anywhere?
- No. Parsing and conversion run entirely in your browser, so the YAML or JSON you paste, including any internal config, is never sent to a server or stored.
Config that breaks in production?
Untyped manifests, silent defaults, drift between YAML and the API that consumes it. I'll add the schema validation and CI checks that catch bad config before it ships. Book a call, or leave your email.
Prefer proof first? See how this plays out in real case studies →