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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

Loading parser…

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.

Features

Spec-compliant parser

Uses js-yaml (YAML 1.2), so anchors, multiline strings, and typing resolve correctly.

Clear error reporting

Invalid YAML returns the parser's message so you can find the problem line.

100% private

Conversion runs locally — your YAML never reaches a server.

Example

Input

name: Zerethon
tools:
  - json
  - yaml
active: true

Output

{
  "name": "Zerethon",
  "tools": ["json", "yaml"],
  "active": true
}

Common use cases

  1. 1

    Feed YAML config to a JSON API

    Convert a hand-written YAML file into JSON your tooling can ingest.

  2. 2

    Validate YAML syntax

    If it converts cleanly, the YAML is well-formed; if not, the error points at the issue.

  3. 3

    Compare configs

    Normalize YAML to JSON to diff two configs without indentation noise.

Summary

Zerethon's YAML to JSON converter parses YAML 1.2 in your browser with the js-yaml parser and emits equivalent JSON, mapping mappings, sequences, and scalars onto JSON objects, arrays, and values. Malformed input is reported with parser error messages. Everything runs client-side — nothing is uploaded.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

References

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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