Home › Tools › Developer Tools › YAML to JSON Converter

YAML to JSON Converter — Convert YAML Online Free

Convert YAML to formatted JSON instantly. Paste your Kubernetes manifest, Ansible playbook, or any YAML config and get clean, indented JSON output.

Processed on our server — your YAML is never stored or logged.

About YAML to JSON Converter

YAML to JSON Converter parses any valid YAML input and returns clean, formatted JSON. Paste a Kubernetes manifest, an Ansible playbook, a Helm values file, or any YAML configuration block — the converter processes it on the server and returns pretty-printed JSON with 2-space indentation, unescaped slashes, and full Unicode support. Nothing is stored or logged.

Why convert YAML to JSON

YAML is the dominant format for infrastructure configuration — Kubernetes manifests, Docker Compose files, GitHub Actions workflows, and Ansible playbooks all use it. JSON is the standard for APIs, schema validators, and programmatic tooling. Converting between the two is a daily task for DevOps engineers: verify a Kubernetes ConfigMap against a JSON Schema validator, pass a Helm values file to an API endpoint that only accepts JSON, or debug a nested structure by viewing it as JSON. This tool handles the conversion in one step without installing a library or running a script.

Multi-document YAML

YAML files can contain multiple documents separated by ---. A single Kubernetes manifest file often bundles a Deployment, a Service, and a ConfigMap as three YAML documents in one file. The converter handles multi-document input: each document is parsed and the result is returned as a JSON array, one element per document. Single-document input returns a plain JSON object (not wrapped in an array).

Processing and privacy

Your YAML is sent to the server only for the duration of the conversion request and is discarded immediately after. No data is written to disk, logged, or shared. The conversion uses PHP's native YAML extension (yaml_parse_all()) where available, with Spyc as a pure-PHP fallback — both support the same YAML 1.1 and 1.2 features including anchors, aliases, block and flow styles, and multi-line strings.

Common use cases

Validating Kubernetes manifests against JSON Schema — A platform engineer needs to validate a Kubernetes Deployment manifest against a JSON Schema definition. Paste the YAML manifest here, convert to JSON, then paste the JSON into a JSON Schema validator. The structure and field names are preserved exactly.
Converting Helm values for API payloads — A DevOps engineer needs to pass Helm chart values to a CI/CD API endpoint that only accepts JSON. Paste the values.yaml content, convert to JSON, and POST the result directly to the API.
Debugging Ansible playbooks — A systems engineer debugging a complex Ansible playbook with deeply nested variables finds JSON easier to read than YAML for large structures. Convert the playbook YAML to JSON to inspect the parsed structure and verify variable scoping.
Bundled Kubernetes manifests (multi-document) — A developer has a multi-document YAML file bundling a Deployment, Service, and ConfigMap with --- separators. Each document is parsed and returned as an element in a JSON array — making it easy to inspect each resource's structure independently.
CI/CD pipeline config inspection — A developer wants to verify the parsed structure of a GitHub Actions workflow or a GitLab CI YAML file. Converting to JSON makes it immediately clear how nested keys, anchors, and aliases are resolved — especially for complex matrix build configurations.

Frequently asked questions

How do I convert YAML to JSON online?

Paste your YAML into the input panel and click "Convert to JSON". The tool parses your YAML on the server and returns pretty-printed JSON with 2-space indentation. You can also upload a .yaml or .yml file directly (max 1 MB).

What is the difference between YAML and JSON?

YAML is a human-readable format designed for configuration files — it uses indentation for structure and is easier to write by hand. JSON uses explicit braces and brackets and is the standard for APIs and data exchange. YAML is a superset of JSON and supports additional features like comments, anchors, and aliases that JSON does not.

Does the converter support multi-document YAML (--- separator)?

Yes. If your file contains multiple YAML documents separated by ---, each document is parsed and the result is returned as a JSON array — one element per document.

Can I convert a large YAML file to JSON?

Yes. The maximum input size is 1 MB, which covers virtually all real-world YAML configuration files including large Kubernetes manifests and Helm chart values. If your file is larger, split it into separate documents before converting.

Is my YAML data uploaded to a server?

Your YAML is sent to our server only to process the conversion and is discarded immediately after. Nothing is stored, logged, or shared. The conversion uses PHP's native YAML extension where available, with Spyc as a pure-PHP fallback.

Does this work on large files?

Yes — all processing runs on AT USE's server infrastructure, not in your browser. YAML files up to 1 MB are supported. Browser-only tools cannot process large inputs or files at this scale.

How is this different from browser-only tool sites?

Unlike browser-only tools — which can't handle large YAML files and often crash on complex manifests — AT USE's converter runs entirely on our servers using PHP's native YAML parser. Server-side processing handles multi-document YAML, deeply nested structures, and anchors without browser memory limits.

Base64-encode secret values for Kubernetes Secret YAML data blocks, or decode base64 values in Helm chart outputs and ConfigMap entries.

Open tool