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Expensico

YAML to JSON Converter

Convert YAML configuration to formatted JSON, with clear error messages for invalid YAML. Supports multi-document files. Runs locally.

Runs in your browser. Your files are processed on your device and are never uploaded.

How to use the YAML to JSON Converter

  1. Choose or drop your YAML file.
  2. Select Convert. Conversion happens instantly in your browser.
  3. Preview the result and download your JSON file.

About this YAML to JSON converter

Convert YAML files to JSON for APIs, scripts and tools that don't understand YAML. Multi-document YAML (separated by ---) becomes a JSON array.

How YAML to JSON conversion works

  1. The YAML is parsed with a YAML 1.2 parser in your browser.
  2. Anchors and aliases are resolved, and the data is written as indented JSON.

Conversion quality: Exact. Data is preserved exactly. YAML comments are not part of JSON.

When to convert YAML to JSON

  • Feeding configuration into JSON-only tools
  • Debugging how a YAML file is actually interpreted

Limitations to be aware of

  • Comments are dropped because JSON doesn't support them.
  • Custom YAML tags are not supported.

YAML vs JSON

YAML. YAML is a human-friendly data format that uses indentation instead of brackets. It is widely used for configuration files (Docker Compose, Kubernetes, CI pipelines).

JSON. JSON (JavaScript Object Notation) is the most common format for exchanging structured data between web services. It supports nested objects and arrays, strings, numbers, booleans and null.

Frequently asked questions

Why does my YAML fail to parse?

The most common causes are tabs used for indentation and inconsistent indentation levels. The error message shows the line and column.

Are my files uploaded?

No. This tool reads and processes files directly in your web browser. Nothing is sent to Expensico's servers, and the data is discarded when you close or reload the page.