JSON to YAML Converter
JSON (JavaScript Object Notation) and YAML (YAML Ain't Markup Language) are both widely used data serialization formats. JSON is compact and universally supported in APIs and web applications, while YAML is more human-readable with its indentation-based syntax — making it the format of choice for configuration files in tools like Docker, Kubernetes, and GitHub Actions.
This converter handles bidirectional transformation: paste JSON and get clean, properly indented YAML output, or paste YAML and receive valid, formatted JSON. Both directions include error detection so you can immediately spot malformed input. No data leaves your browser — the conversion happens entirely client-side.
How it works
JSON → YAML: parse the JSON string into a JavaScript object, then serialize it using YAML dump with 2-space indentation. YAML → JSON: load the YAML string into a JavaScript object, then serialize it using JSON.stringify with 2-space indentation.
Use cases
- Converting JSON API responses into YAML configuration files for CI/CD pipelines
- Transforming Kubernetes or Docker Compose YAML configs to JSON for programmatic processing
- Migrating application configs between frameworks that prefer different formats
- Validating YAML or JSON syntax and quickly spotting formatting errors
- Preparing data payloads for REST APIs that require JSON from YAML source files
Frequently asked questions
What is the difference between JSON and YAML?
JSON uses braces, brackets, and quotes to delimit data, while YAML relies on indentation and is generally easier for humans to read and edit. YAML also supports comments (lines starting with #), which JSON does not. JSON remains the standard for APIs and web applications, whereas YAML dominates configuration files in Docker, Kubernetes, and CI/CD tools.
How do I convert JSON to YAML?
Paste your JSON into the input field and the tool parses it into an object, then serializes it as YAML with 2-space indentation. Keys, nesting, arrays, and data types are preserved exactly. Malformed JSON triggers an error message so you can spot and fix the problem immediately.
Can I convert YAML back to JSON?
Yes, the converter works in both directions. Paste YAML and it is loaded into a JavaScript object, then serialized with JSON.stringify using 2-space indentation. This is useful for turning Kubernetes or Docker Compose configs into JSON for programmatic processing.
Why do Kubernetes and Docker use YAML instead of JSON?
Configuration files are written and reviewed by humans, and YAML's indentation-based syntax is less noisy than JSON's braces and quotes. YAML also allows inline comments, which are essential for documenting configuration decisions. Since YAML is a superset of JSON for most practical purposes, valid JSON can usually be dropped into a YAML file unchanged.
Is the conversion done locally in my browser?
Yes. Both directions run entirely client-side — no data leaves your browser and nothing is uploaded or stored on a server. That makes the tool safe for configuration files containing secrets references, internal hostnames, or other sensitive values.