Skip to content

YAML to JSON Converter

Convert YAML to JSON in your browser. Parse errors report the exact line and column; multi-document files are refused instead of guessed.

Paste YAML

Indentation

JSON result

Paste YAML, then convert.

The JSON appears here after conversion.

Limit for uploaded files: 10 MB. Pasted text is not truncated by the tool — your browser’s memory is the ceiling.

Your file is never sent to a server. It is read and processed by your own browser, and the results are not stored.

How to use it

  1. Paste YAML, or choose a .yaml / .yml file.
  2. Pick the indentation for the JSON output.
  3. Convert, then copy the JSON or download it.

Limits worth knowing

  • Single document only; multi-document YAML is refused with the document count.
  • Comments cannot survive because JSON has no comment syntax.
  • Alias and anchor references are resolved once; cyclic graphs are an error, not a hang.
  • Files above 10 MB are refused to keep the tab responsive.

Where YAML goes wrong

Almost every YAML failure is a whitespace or quoting problem: a tab where a space should be, a value like "on" that YAML reads as a boolean, or a list item at the wrong indentation. This tool reports the parser’s own line and column rather than reformatting around the error.

YAML is commonly used for configuration that a system applies verbatim; a silently different file is worse than a loud error.

Booleans and other YAML surprises

Under the core schema, yes/no/on/off are booleans and 123 is a number. That is correct for well-written YAML; if your values are meant to be strings, quote them in the source and the JSON will agree.

Frequently asked questions

Does YAML to JSON Converter upload my files to any server?

No. YAML to JSON Converter runs in your browser, and the file is read there rather than sent to a server for processing. Our host still sees ordinary page-request metadata, which is described on the privacy page.

Is YAML to JSON Converter free to use?

Yes, YAML to JSON Converter is free, with no paid tier, no account, and no watermark added to your output. The limits are technical rather than commercial: file size, page count and supported formats are listed on this page.

What file formats and sizes are supported?

YAML to JSON Converter supports .yaml, .yml, .txt files up to 10MB directly in your browser.

Is the YAML execution-safe?

Yes. The parser runs in safe mode — no code is evaluated from tags. Your YAML is read strictly as data.

What about files with several documents (---)?

This tool converts a single document. If your file has several, split it first or use the per-document count in the error message to know how many there are.

Which YAML version is supported?

YAML 1.2 core schema, which is what Kubernetes, GitHub Actions and most modern tooling produce. Duplicate keys are reported rather than silently overwritten.

Does it keep comments?

No. JSON has no comment syntax, so comments cannot survive the conversion. Keep the YAML file if you need them.