How to Convert YAML to JSON Online
Many APIs and tools require JSON, but your config is in YAML. Converting by hand is slow and error-prone. Here's how to do it instantly.
Quick Answer
Paste your YAML into the YAML to JSON converter at dotsapps.com. It parses the YAML and outputs valid, formatted JSON. Free, instant, and runs in your browser.
Why Convert YAML to JSON?
YAML and JSON store the same kind of data but in different formats. YAML is easier to read and write by hand. JSON is what most APIs, databases, and programming languages expect.
Here are the most common reasons to convert:
- API requests: REST APIs almost always accept JSON, not YAML.
- JavaScript/TypeScript: JSON.parse() works natively. YAML needs a library.
- Validation tools: Many JSON schema validators don't accept YAML.
- Cross-tool compatibility: Some CI/CD tools output YAML configs that need to be consumed as JSON elsewhere.
YAML vs JSON Syntax Differences
Understanding the syntax differences helps you catch conversion issues:
- Indentation vs braces: YAML uses indentation to show nesting. JSON uses curly braces {} and square brackets [].
- Quotes: YAML strings usually don't need quotes. JSON strings always need double quotes.
- Comments: YAML supports comments with #. JSON has no comment syntax, so comments get dropped during conversion.
- Data types: YAML auto-detects types (yes/no becomes boolean). JSON requires explicit true/false.
The biggest gotcha is YAML's type coercion. The value no in YAML becomes false in JSON. The value 3.0 stays a float. If you need the string "no" or "3.0", wrap it in quotes in your YAML.
Convert Kubernetes YAML Configs to JSON
Kubernetes is the #1 reason developers need YAML-to-JSON conversion. K8s config files are written in YAML, but kubectl also accepts JSON. Some tools and APIs around Kubernetes only work with JSON.
A typical Kubernetes deployment YAML can be 50-100 lines. Converting it by hand means adding braces, brackets, commas, and quotes everywhere. One missed comma breaks the whole file.
The YAML to JSON converter at dotsapps.com handles any valid YAML structure. Multi-document YAML files (separated by ---) are supported too. Paste your K8s config, get valid JSON, and use it wherever you need it.
Common YAML to JSON Conversion Errors
If your conversion fails, check these common problems:
- Bad indentation: YAML is strict about spaces. Mixing tabs and spaces causes errors. Use spaces only, and keep levels consistent (2 or 4 spaces).
- Missing colons: Every YAML key needs a colon and a space after it. "key:value" fails — it should be "key: value".
- Special characters in strings: Colons, hashes, and brackets inside values need quotes. Otherwise YAML misreads them.
- Duplicate keys: YAML allows duplicate keys (last one wins). JSON parsers may reject them.
The converter tool shows clear error messages when YAML is invalid. Fix the error in your YAML, then try again.
How to Do It: Step-by-Step
- 1
Open the YAML to JSON converter at dotsapps.com.
- 2
Paste your YAML content into the input field.
- 3
The tool parses the YAML and shows the JSON output instantly.
- 4
Check the output for correctness.
- 5
Copy the JSON or download it as a file.
Frequently Asked Questions
Can I convert YAML to JSON without installing anything?
Yes. Online tools like the one at dotsapps.com work directly in your browser. No installs, no signup. Just paste and convert.
Does YAML to JSON conversion lose any data?
Comments are the only thing lost. YAML supports comments (#) but JSON does not. All actual data — strings, numbers, booleans, arrays, objects — converts perfectly.
How do I convert multi-document YAML to JSON?
Multi-document YAML files use --- as a separator. A good converter handles each document separately and outputs a JSON array containing all documents.
What is the difference between YAML and JSON?
YAML uses indentation and is more human-readable. JSON uses braces and brackets and is more machine-readable. Both store the same data types. YAML supports comments; JSON does not.
Can I convert JSON back to YAML?
Yes. Use the JSON to YAML converter at dotsapps.com to go the other direction. The conversion is lossless both ways (except YAML comments).
Ready to Try It?
YAML to JSON Converter is free, private, and works right in your browser. No sign-up needed.
Open YAML to JSON Converter