YAML ↔ JSON Converter

A YAML ↔ JSON Converter lets you instantly translate between YAML (YAML Ain't Markup Language) and JSON (JavaScript Object Notation) — the two most widely-used data serialization formats in modern software development. Whether you're reading a Kubernetes config, writing a GitHub Actions workflow, or transforming an API response, this tool eliminates the tedious manual rewriting.

The UtilsGo YAML ↔ JSON Converter runs entirely inside your browser. Your configuration files, secrets, and API payloads are never transmitted to a server. Conversion is powered by js-yaml, the same parser used in thousands of production Node.js applications, giving you a spec-compliant result every time.

When would you need this?

YAML → JSON is most common when working with infrastructure tooling. Kubernetes manifests, Ansible playbooks, Docker Compose files, and GitHub Actions workflows are all YAML — but most REST APIs, SDKs, and monitoring dashboards consume JSON. Paste your YAML config, click convert, and you have a JSON payload ready to POST.

JSON → YAML is the reverse: API responses and database exports tend to be JSON, while modern CI/CD config files (CircleCI, Buildkite, GitLab CI) are YAML. Converting a long JSON payload into YAML makes it far easier to read, comment, and check into source control.

Key differences at a glance

YAML supports comments (#), uses indentation instead of brackets, and is less verbose — making it ideal for config files. JSON is stricter, universally supported, and required by most REST APIs and tooling. YAML allows loose syntax variants while JSON parsing is exact.

The Flip button lets you immediately use your output as the next input — perfect for round-trip validation.