YAML ↔ JSON Converter
Bidirectional YAML and JSON conversion with error reporting
About the YAML ↔ JSON Converter
YAML is everywhere in the DevOps world — Kubernetes manifests, GitHub Actions workflows, Docker Compose files, Ansible playbooks, Helm charts, and CI/CD pipeline configs all default to it. JSON is what APIs, debuggers, and most programming language runtimes speak natively. The YAML ↔ JSON Converter lets you translate between the two in real time, in either direction, without switching tools or running a script in your terminal.
Platform engineers paste a Kubernetes deployment manifest to understand its JSON equivalent before writing a validation rule against the Kubernetes API. Node.js developers convert a GitHub Actions workflow YAML into JSON so they can feed it into a JSON schema validator or diff tool. Configuration authors paste a complex nested YAML to verify the parsed structure matches what they intended — catching accidental indentation errors that change the hierarchy without triggering a parser error.
Two tabs handle each direction: "YAML → JSON" and "JSON → YAML". Both sides update in real time as you type. Errors surface with the specific line and column information that js-yaml provides — so "mapping values are not allowed here at line 3, column 5" tells you exactly where to look. The YAML output uses a clean two-space indented format; the JSON output is formatted with two-space indentation as well, ready to read or paste.
How to Use the YAML ↔ JSON Converter
- Select the "YAML → JSON" tab to convert YAML to JSON, or "JSON → YAML" to go the other direction.
- Click "Load example" to pre-fill a sample input if you want to explore the output format before pasting your own data.
- Paste or type your YAML (or JSON) into the left input panel. Conversion happens in real time.
- If there is a syntax error — wrong indentation, a missing colon, or invalid JSON — an error message appears below the input showing the line and description.
- Click "Copy" to send the output to your clipboard.
Why Use ToolForge’s YAML ↔ JSON Converter
- Uses js-yaml, a battle-tested library that supports the full YAML 1.2 spec including multi-line strings, anchors, and aliases — features that simpler parsers miss.
- Real-time conversion means you see the result change as you fix a YAML indentation error, eliminating the slow edit-run-check cycle in a terminal.
- Line-number error reporting pinpoints exactly where a parse failure occurs rather than returning a generic "invalid YAML" message.
- Client-side only — Kubernetes secrets, CI tokens, and database connection strings in config files never leave your browser.
Frequently Asked Questions
Why does my YAML parse without error but the JSON output looks wrong?
YAML is sensitive to indentation — a key indented one space too few or too many becomes a child of a different parent node, changing the structure without triggering a parse error. Compare your indentation carefully: each level should be consistently two (or four) spaces, with no mix of tabs and spaces.
Does the converter handle YAML anchors and aliases?
Yes. js-yaml resolves YAML anchors (&anchor) and aliases (*anchor) during parsing, so the JSON output contains the fully expanded, dereferenced values — the same structure your application would receive at runtime.
Is this tool useful for Kubernetes config files?
Yes, this is a common use case. Paste a Kubernetes YAML manifest to inspect its JSON equivalent — which is what the Kubernetes API Server actually processes. This helps when writing validation webhooks, JSON patch operations, or kubectl --patch arguments that require JSON format.
Is my config file data sent to any server?
No. Conversion runs entirely in your browser using the js-yaml library. Your YAML or JSON — including any secrets, tokens, or connection strings — never leaves your device.
