YAML failures almost never occur where the parser points. A list that silently becomes a map will not error at all, it just changes meaning. Validating the structure is the only way to catch that class of bug.
Paste your YAML and it validates the indentation-based structure and normalizes scalars, lists, and maps. When a config “works” but behaves wrong, the validator often reveals the misnested block.
Try it now: open the free tool, runs 100{b8b7921c843ac9e5edcbca134af59decad3ed340e0e3b2e6c286158f277affea} in your browser.
Bottom line: validate indentation before the stack trace finds it for you.
Your turn: use the tool free here, no signup, nothing leaves your device.
How do you use YAML Validator / Formatter?
Open the YAML Validator / Formatter in your browser (Check and clean YAML). Type or paste your input, adjust the options, and copy the result. Everything runs locally on your device with no account and nothing stored, so the three steps below take seconds even for confidential work.
- Paste the data or snippet you want to process.
- Run the tool and watch the output update.
- Copy the result for use in your own code.
Try YAML Validator / Formatter free. It opens right in your browser.