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YAML to JSON Converter — Free Online Parser with Error Reports

Convert YAML to JSON in your browser. Catches syntax errors with parser messages.

Free No signup Client-side Privacy friendly Updated

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How to use

  1. 1 Paste valid YAML.
  2. 2 Toggle pretty print for indented JSON, off for compact.
  3. 3 Copy or download.

Why use this tool

  • Powered by js-yaml — handles anchors, aliases, multi-document streams.
  • Validation catches syntax errors with line numbers.
  • Pretty mode for readability, compact mode for storage / transmission.
  • Pure client-side.

Frequently asked questions

How are dates and booleans converted?

js-yaml uses YAML 1.2 — dates become ISO strings, true/false as booleans. "yes"/"no" stay strings (1.2 spec).

What about multi-document YAML (--- separators)?

Only the first document is converted. To handle multiple, split on `---` first.

Can it handle YAML anchors and aliases?

Yes — anchors (&) and aliases (*) are resolved on parse, producing duplicated data in JSON.

What is YAML to JSON Converter?

A YAML to JSON Converter is a tool that parses YAML input and emits the equivalent JSON, mapping YAML mappings, sequences, and scalars onto JSON objects, arrays, and values. When the source is malformed, it reports syntax errors with parser messages so problems can be located and fixed. The conversion runs entirely in the browser, processing the input client-side without uploading it to a server.

Summary

YAML to JSON Converter is a free developer utility by Zerethon Tools. Convert YAML to JSON in your browser. Catches syntax errors with parser messages. Runs entirely in the browser — no signup, no upload.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

Privacy

Your data never leaves your browser unless explicitly stated. YAML to JSON Converter runs entirely client-side — no server upload, no logging, no tracking of your input.

Compare

JSON vs YAML YAML vs XML

Learn the basics

What is YAML?

How-to guides

How to convert json to yaml

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