Free Online YAML to JSON Converter
Convert Kubernetes manifests, Docker Compose files, OpenAPI specs, and YAML configs into clean, valid JSON — 100% client-side with zero uploads.
YAML Input
JSON Output
Quick answer
To convert YAML to JSON online, paste or upload your `.yaml` or `.yml` file into the KaviForge YAML to JSON Converter and click "Convert to JSON". It validates your YAML indentation and outputs pretty-printed JSON locally in your browser.
YAML is the standard for Kubernetes manifests, Helm charts, GitHub Actions, Docker Compose, and OpenAPI specifications, while REST APIs, `jq`, and JavaScript applications expect JSON.
This converter uses `js-yaml` directly in your browser to parse complex YAML features—including multi-line strings, comments, anchors/aliases, and nested lists—into clean, formatted JSON without uploading sensitive infrastructure configs.
How to Convert YAML to JSON Online
- 1Paste your YAML configuration into the left editor or upload a `.yaml` / `.yml` file.
- 2Select your desired JSON indentation (2, 3, 4, or 5 spaces).
- 3Click "Convert to JSON" to parse the YAML and generate formatted JSON.
- 4Copy the JSON output or click Download to save `output.json`.
Features
Full YAML 1.2 Support
Handles nested mappings, sequences, multi-line strings (`|` and `>`), comments, and YAML anchors.
Instant YAML Validation
Pinpoints indentation errors or invalid syntax before converting to JSON.
Custom JSON Indentation
Format the resulting JSON with 2, 3, 4, or 5 spaces.
Upload .yaml / .yml Files
Open local YAML files and download `.json` output in one click.
Bidirectional Mode Switcher
Switch between YAML to JSON, JSON to YAML, and YAML Formatter anytime.
100% Private for DevOps Secrets
Kubernetes manifests, Helm values, and CI/CD secrets never leave your browser tab.
When to Use the YAML to JSON Converter
Convert OpenAPI / Swagger YAML to JSON
Turn an `openapi.yaml` specification into `openapi.json` for API gateways and SDK generators.
Debug Kubernetes & Helm YAML
Inspect how YAML indentation and anchors resolve by viewing the exact equivalent JSON structure.
Use YAML configs with jq or REST APIs
Convert YAML configuration files into JSON payloads for HTTP requests or `jq` scripts.
How YAML to JSON Conversion Works
YAML is a superset of JSON designed for human readability using indentation instead of braces. When converting YAML to JSON, comments are stripped, YAML sequences (`- item`) become JSON arrays (`["item"]`), and key-value mappings become JSON objects.
Because everything runs locally in your browser, you can safely convert production `docker-compose.yml` files, Kubernetes ConfigMaps, and GitHub Actions workflows without exposing internal endpoints or credentials.
YAML to JSON Converter FAQs
How do I convert a .yaml or .yml file to JSON?
Click "Upload YAML" (or paste your YAML into the left editor) and click "Convert to JSON". You can copy the JSON or download it as `output.json`.
What happens to YAML comments when converting to JSON?
Standard JSON does not support comments (`#`), so comments are automatically stripped during conversion while all data keys and values are preserved.
Is my YAML file uploaded to any server?
No. Parsing and conversion happen 100% inside your browser.
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