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Bi-directional conversion · Kubernetes, Docker, CI/CD

JSON ↔ YAML Converter

Convert between JSON and YAML in both directions. Perfect for working with Kubernetes manifests, GitHub Actions workflows, Docker Compose files, OpenAPI specs, and any tool that accepts either format.

Input JSON
Output YAML 
Converted output will appear here
JSON vs YAML: when to convert

JSON vs YAML: when to convert

JSON and YAML are both popular ways to represent structured data — they share the same underlying model of keys, values, lists, and nested objects. The difference is presentation. JSON uses braces and brackets and double quotes (machine-friendly); YAML uses indentation and minimal punctuation (human-friendly).

You'll encounter both in any modern infrastructure stack. Kubernetes accepts both but documentation is mostly YAML. GitHub Actions, GitLab CI, and CircleCI all use YAML. Docker Compose uses YAML. AWS CloudFormation accepts both. OpenAPI specs come in both. Helm charts are YAML. Ansible playbooks are YAML.

If you're working programmatically — generating configs, validating against schemas, transforming data — JSON is usually easier because every language has fast native JSON support, and JSON Schema tooling is more mature. If you're hand-editing — writing a CI workflow, tweaking a deployment, reviewing a code review — YAML is often less typing and more scannable.

This converter lets you have it both ways. Generate JSON programmatically, convert to YAML for hand-editing. Or hand-write YAML, convert to JSON for programmatic processing. Either direction works.

How to convert JSON to YAML (and back)

How to convert JSON to YAML (and back)

The conversion is straightforward:

  1. Choose the direction — JSON to YAML or YAML to JSON.
  2. Paste your input into the left panel.
  3. The converter runs automatically — output appears on the right.
  4. Copy the result with one click.

JSON → YAML is straightforward because JSON's data model is a strict subset of YAML's. Everything in JSON can be expressed in YAML without information loss. YAML → JSON works in reverse but loses YAML-specific features that JSON can't represent (comments, anchors, custom tags, multi-line string folding markers).

Where JSON ↔ YAML conversion is most useful

Where JSON ↔ YAML conversion is most useful

☸ Kubernetes manifests

K8s YAML files are easier to edit by hand. But when you're generating manifests with templating tools or validating them against the OpenAPI spec, working in JSON is often simpler.

⚙ GitHub Actions / GitLab CI

Workflow files are always YAML. If you're generating them from a JSON template (common in monorepos with many similar pipelines), this converter is the bridge.

🐳 Docker Compose

docker-compose.yml is YAML. Convert from a JSON config exported by your application or generated by a deployment tool.

📋 OpenAPI / Swagger

OpenAPI specs are valid in both formats. Some tools (Stoplight, Postman) prefer one; some prefer the other. Convert as needed.

⚓ Helm charts

Helm values.yaml files configure Helm-templated YAML. When testing values, JSON conversion lets you use JSON-only validators and transformers.

📦 AWS / GCP / Azure configs

CloudFormation, Terraform's output, deployment manifests — all support both formats. Convert to whichever your downstream tool expects.

Common questions

FAQ — Json To Yaml

What's the difference between JSON and YAML?
Both represent the same data model (keys, values, lists, nested objects) but with different syntax. JSON uses braces, brackets, and double quotes; YAML uses indentation and minimal punctuation. YAML is easier to write by hand; JSON is easier to generate programmatically. The two formats can represent essentially the same data — though YAML has features (comments, anchors, custom tags) that JSON lacks.
Is YAML a superset of JSON?
YAML 1.2 is essentially a superset of JSON — any valid JSON document is also a valid YAML 1.2 document. This is by design, so YAML parsers can be drop-in replacements for JSON parsers. YAML 1.1 (older spec) had some incompatibilities, but most modern YAML libraries default to 1.2.
Will YAML comments be preserved when converting to JSON?
No. JSON has no comment syntax, so any comments in your YAML are lost when converting to JSON. If you need comments to survive, work directly in YAML or use JSONC (JSON with Comments) — though JSONC isn't standard JSON and our converter doesn't produce it.
How does this handle YAML-specific features like anchors and aliases?
Anchors (&name) and aliases (*name) are resolved during conversion — the referenced value is inlined wherever the alias appears. The resulting JSON has no concept of references, so the conversion is one-way: converting back to YAML won't restore the original anchor/alias structure.
What YAML version is supported?
YAML 1.2, the current spec. Our converter handles the common YAML patterns: nested maps, sequences, scalars, multi-line strings, and basic anchors. We don't support exotic features like custom YAML tags (!!type) or YAML directives (%YAML 1.1).
Can I convert OpenAPI specs?
Yes — OpenAPI is one of the most common use cases. The full spec converts cleanly in both directions because OpenAPI uses only the common subset of YAML features.
Are tabs handled correctly?
YAML requires spaces for indentation — tabs are not allowed in structural positions. If your input YAML has tabs, the converter will report an error. Convert tabs to spaces first (most editors have a single command for this).
What about Helm template syntax in YAML files?
Helm uses {{ .Values.foo }} template syntax that's invalid YAML before rendering. Our converter expects valid YAML; for Helm files, render the template first (helm template) and then convert the rendered YAML.
How big a file can I convert?
Up to about 10 MB comfortably. YAML conversion is slower than pure JSON formatting because YAML parsing is more involved. For larger files, use a command-line tool like yq.
Why does my YAML produce strange JSON?
Most likely the YAML has implicit type coercion you didn't expect. yes becomes true, 1.23e2 becomes 123, and bare strings that look like numbers become numbers. To force a string, wrap in quotes: foo: "yes" stays as the string "yes".
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