JSON ↔ YAML Converter

Bidirectional conversion — runs entirely in your browser

Indent:
100% local
JSON Input
YAML Output
12 lines
148 chars

Secure Client-Side JSON ↔ YAML Converter

Convert JSON to YAML or YAML to JSON instantly in your browser. Powered by the js-yaml library running locally — no server, no uploads, no tracking. Supports nested structures, arrays, and configurable indentation.

How It Works: Local js-yaml Conversion

The converter uses the js-yaml library bundled into the page. JSON is parsed natively and then serialized to YAML, or YAML is parsed and serialized back to pretty-printed JSON — all inside your browser without a network call.

  • Real-time conversion as you type.
  • Supports nested objects, arrays, and all JSON data types.
  • Bidirectional — convert JSON→YAML or YAML→JSON.

Why It's Safe: No Data Transmission

Config files often contain database passwords, API keys, and environment-specific secrets. Pasting them into a server-side converter creates a real risk of exposure. noserver runs entirely locally — your config data never leaves your browser.

  • Safe for docker-compose, Kubernetes, and .env configs.
  • No backend logs your API keys or connection strings.
  • Works offline after first page load.

Frequently Asked Questions

Does NoServer upload my JSON or YAML to a server?
No. Conversion is handled entirely in your browser using the js-yaml library compiled to JavaScript. No data is ever transmitted over the network.
Is it safe to convert production configs or secrets here?
Yes. Your data is processed in local browser memory only. Application secrets, database connection strings, and API keys in your config files never leave your device.
Can I convert YAML back to JSON?
Yes. The tool supports bidirectional conversion. Switch direction to convert YAML input to prettified JSON output with a single click.
Can I use this without an internet connection?
Yes. Once the NoServer application loads in your browser, the converter works entirely offline. The js-yaml library is cached and requires no network access.
What YAML features are supported?
The converter produces clean YAML 1.2 output including nested objects, arrays, multi-line strings, and null/boolean/number types. Anchors and aliases from YAML input are resolved on parse.
Can I control the YAML indentation?
Yes. Choose 2-space or 4-space indentation for the YAML output — useful for matching your team's style guide or target tooling requirements.
Does it handle JSON arrays as top-level input?
Yes. Top-level JSON arrays are converted to YAML sequences correctly, including nested arrays of objects such as Kubernetes resource lists.
How does noserver compare to json2yaml.com?
json2yaml.com sends your input to their backend for conversion. noserver converts JSON to YAML (and vice versa) entirely in your browser — your config files, secrets, and environment variables never leave your device.

Common Use Cases

Kubernetes Manifests

Convert JSON Kubernetes resource definitions from kubectl get -o json into YAML manifests for committing to GitOps repositories.

API Response to Config

Convert JSON API responses into YAML config files for tools like Ansible, Helm, or GitHub Actions workflows without a backend service.

OpenAPI / Swagger

Switch OpenAPI specs between JSON and YAML format to match your documentation tooling requirements — locally, without exposing internal API schemas.

noserver vs json2yaml.com vs transform.tools

json2yaml.com and similar tools pass your configuration data to server-side parsers. For most JSON this is acceptable, but docker-compose files, Kubernetes secrets, and GitHub Actions configs often contain sensitive values. noserver bundles js-yaml directly into the browser bundle — conversion runs 100% locally with no server contact, no logging, and no rate limits. It works offline, handles YAML anchors and aliases correctly, and produces YAML 1.2-compliant output.

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