— Data & developer

YAML to JSON Converter

Paste YAML and get clean, pretty-printed JSON — nested maps, sequences, quoted scalars and comments, all in your browser.

Drop a file here or click to choose — it never leaves your browser
— What it does

The YAML to JSON Converter is a free tool that parses a practical subset of YAML into pretty JSON entirely in your browser. It supports indentation-based nested maps, dash-marked sequences, scalars (string, number, boolean, null), single- and double-quoted strings, inline hash comments, and blank-line skipping. Advanced YAML such as anchors, aliases, tags, multi-document streams, and block scalars is not supported and is reported with a clear message instead of crashing.

  • Indentation-based nested maps and dash-marked sequences.
  • Scalars with type inference plus single- and double-quoted strings and inline comments.
  • Friendly errors for unsupported YAML instead of silent failures or crashes.
  • Runs entirely in your browser — your YAML is never uploaded to a server.

How to use it

1

Paste your YAML

Paste YAML using maps, sequences, and scalars (or drop a .yaml file) into the input box.

2

Review the JSON

The parser converts your YAML to pretty-printed JSON as you type and flags anything in the unsupported subset.

3

Copy or download

Copy the JSON to your clipboard or download it as a .json file.

Frequently asked

Is my YAML uploaded anywhere?
No. Parsing runs entirely in your browser with JavaScript. Your data never leaves the page, so it is safe for configs and secrets.
Which YAML features are supported?
Indentation-based nested maps, sequences with the dash marker, plain and quoted scalars with type inference (string, number, boolean, null), inline hash comments, and blank lines. Anchors, aliases, tags, multi-document streams, and block scalars are not supported.
What happens with unsupported YAML?
Instead of crashing, the converter shows a friendly error describing the construct it could not parse, so you can simplify the input or fix the indentation.
How are scalar types decided?
Unquoted true, false, null (and ~), and numeric-looking values are converted to the matching JSON types. Quoted values always stay strings, so "true" or "007" round-trip as text.

Related tools

JSON to YAML Converter

Paste JSON and get readable, correctly-quoted YAML — nested maps, sequences, and multiline strings, all in your browser.

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JSON Formatter & Validator

Paste JSON to beautify or minify it, validate the syntax, and pinpoint errors — instantly and entirely in your browser.

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CSV to JSON Converter

Paste CSV or drop a file and get a clean JSON array of objects — quoted fields, custom delimiters, headers and type inference, all in your browser.

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← All free tools

— Built by saavos

These tools are free. So is the first version of your agent.

saavos is the AI agent that lives on your website — themed to match your design, answering visitors from your own content, and telling you what they actually want to know. Paste your URL and see it answer, before you install anything.

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