Free · No Signup · Runs in Your Browser

Convert YAML to JSON
in Seconds — Free Online Tool

Paste or upload any YAML file and get clean, formatted JSON instantly. Handles nested data, anchors & aliases, and multi-line strings. Runs 100% in your browser — your data never leaves your device.

100% Private & Offline Anchors & Aliases Multi-line Strings Kubernetes & Docker No Signup

Choose an example dataset:

Select an example and click "Convert Example".


          
        

      

      
      
    

  






  

    

      
How It Works

      
Convert YAML to JSON in 3 Easy Steps

      
No software to install. No registration. Works in any web browser.

    

    

      
Paste or Upload Your YAML
Drag and drop a .yaml or .yml file, paste YAML text directly, or load an example. Supports nested maps, lists, anchors, and comments.

      
Convert to JSON Instantly
Click "Convert to JSON" and get a pretty-printed, syntax-highlighted result. Aliases are resolved and multi-line strings are preserved.

      
Copy or Download Your JSON
Copy the JSON to your clipboard or download it as a .json file. Ready for APIs, config, or JavaScript.

    

  






  

    

      
Features

      
Why Choose Our Free YAML to JSON Converter?

      
Built for developers, DevOps engineers, and anyone who needs fast, secure YAML to JSON conversion.

    

    

      
100% Client-Side Privacy
Your YAML is parsed entirely in your web browser. Zero server uploads, zero logs, zero privacy risks.

      
Instant Conversion
No queues, no waiting. Converts large YAML files to JSON in milliseconds, right in your browser.

      
Anchors & Aliases Resolved
YAML & anchors and * aliases are expanded automatically so your JSON output is complete and valid.

      
Comments & Multi-line Strings
Block scalars (| and >) and folded strings are handled correctly. Comments are dropped, since JSON has no comment syntax.

      
Kubernetes & Docker Ready
Convert Kubernetes manifests, Helm values, and Docker Compose files to JSON — including multi-document YAML.

      
Works Offline
After the page loads, conversion runs locally. No active connection needed to convert YAML to JSON.

    

  






  

    

      
Why Use Our Tool

      
Why Convert YAML to JSON?

      
Whether you need a free YAML to JSON converter to inspect a config file or a reliable way to convert YAML to JSON online, this browser tool does it instantly — no installs, no signups, no limits.

    

    

      
⎈ Kubernetes YAML to JSON
Need a Kubernetes YAML to JSON converter? Paste any manifest and get JSON you can feed to kubectl, APIs, or tests. Multi-document manifests are supported.

      
🐳 Docker Compose to JSON
Easily turn a Docker Compose YAML to JSON file. Great for tooling, validation, and inspecting your service definitions as plain data.

      
📋 Paste YAML, Convert to JSON
This is a simple paste YAML, convert to JSON tool. No account, no upload — just convert YAML to JSON in your browser and copy the result.

      
🛡️ YAML to JSON Converter with Error Checking
Our YAML to JSON converter with error checking shows specific, human-readable messages for tabs, bad indentation, and unclosed quotes — not a generic error.

    

  






  

    

      
FAQ

      
Frequently Asked Questions

    

    

      
How do I convert a YAML file to JSON online? 
Paste your YAML in the box, or upload a .yaml/.yml file. It converts to JSON instantly, right in your browser.

      
Is this YAML to JSON converter free to use? 
Yes — it is a YAML to JSON converter free of charge, with no signup and no usage limits.

      
Is my YAML data uploaded to a server? 
No. Conversion happens entirely in the browser using JavaScript. Nothing is uploaded and nothing is logged.

      
Why am I getting an "invalid YAML" error? 
The most common causes are mixing tabs and spaces, inconsistent indentation, or an unclosed quote. The error message points to the exact line.

      
Does this tool support multi-line strings in YAML? 
Yes. Both literal (|) and folded (>) block scalars are converted correctly into JSON strings.

      
Does this tool support YAML anchors and aliases (& / *)? 
Yes. Aliases are resolved and expanded, so the JSON output contains the full referenced value instead of the alias.

      
Can I convert a Kubernetes YAML manifest to JSON? 
Yes. It works for Kubernetes manifests, Helm values, and other YAML, including multi-document files separated by ---.

      
Can I convert a Docker Compose file to JSON? 
Yes. Paste or upload your docker-compose.yml and get the equivalent JSON structure.

      
What's the difference between YAML and JSON? 
YAML uses indentation and supports comments; JSON uses braces and brackets and has no comment syntax. YAML is technically a superset of JSON.

      
Can I upload a .yml or .yaml file instead of pasting text? 
Yes. Use drag-and-drop or click to browse — the upload YAML file to JSON path accepts both extensions.

      
Does the converter keep comments from my YAML file? 
No. JSON has no comment syntax, so all YAML comments are dropped during conversion.

      
How do I convert YAML to JSON in Python or another language? 
In Python use yaml.safe_load() from PyYAML then json.dumps(). In Node.js use js-yaml — the same library this page uses.