Is my configuration uploaded anywhere?

No — js-yaml runs entirely in your browser, so secrets in your config files never leave your device.

What happens to YAML comments and anchors?

Anchors and aliases are resolved into their actual values. Comments are dropped — JSON has no comment syntax to carry them.

Does it support multi-document YAML files?

Yes — documents separated by --- are converted into a JSON array, with a note telling you how many were found.

How are syntax errors reported?

YAML errors include the exact line and column from the parser; JSON errors surface the position from the engine — so you can jump straight to the problem.

YAML ↔ JSON Converter

Convert YAML to JSON and back, live as you type. Validation reports the exact line and column of any syntax error, multi-document YAML files become JSON arrays, and the output respects your indentation and key-sorting preferences — all in your browser.

How to use YAML ↔ JSON Converter

Pick the direction (YAML → JSON or JSON → YAML) and paste your document — conversion is instant.
Adjust the indent (2/4 spaces, or minified JSON) and toggle key sorting if you want stable ordering.
Copy the result, or hit Swap to feed the output back in the opposite direction.

Frequently asked questions

Is my configuration uploaded anywhere?: No — js-yaml runs entirely in your browser, so secrets in your config files never leave your device.
What happens to YAML comments and anchors?: Anchors and aliases are resolved into their actual values. Comments are dropped — JSON has no comment syntax to carry them.
Does it support multi-document YAML files?: Yes — documents separated by --- are converted into a JSON array, with a note telling you how many were found.
How are syntax errors reported?: YAML errors include the exact line and column from the parser; JSON errors surface the position from the engine — so you can jump straight to the problem.

More Programmer & Developer Tools

Code Beautifier — Automatically format your JavaScript, CSS, and HTML with customizable indentation and style rules.
Minifier — Reduce bundle sizes by removing whitespace, comments, and optimizing code structure for production.
JSON Diff — Compare two JSON objects structurally to spot added, removed, and changed keys — or switch to line and word mode for plain text and code.
JSON Validator — Validate, parse, and prettify JSON data. Identifies syntax errors with precise line number reporting.
RegEx Tester — Build and test regular expressions in real-time with syntax highlighting and match group visualization.
Base64 Converter — Quickly encode and decode strings or files to Base64 format for safe data transmission.
Cron Generator — Generate cron job expressions using a human-friendly interface. Includes execution schedule preview.
JWT Debugger — Decode and inspect JSON Web Tokens. Verify signatures and view payload data without exposing secrets.