YAML to JSON Converter
Paste YAML or YML and get clean, readable JSON instantly — free, private, and entirely in your browser.
Multi-document YAML works too: if your file separates documents with ---, every document is parsed and the result comes back as a JSON array.
Your YAML never leaves this page. Parsing happens in your browser, so nothing is uploaded, logged, or stored.
How to Use the YAML to JSON Converter
- Paste your YAML or .yml content into the input box, or click "Load example" to try a sample docker-compose file.
- Pick the JSON output format: 2 spaces for everyday reading, 4 spaces for wider config files, or minified when you need the smallest possible payload.
- Click "Convert to JSON". Valid YAML becomes JSON immediately; anything the parser rejects is reported with the exact line and column so you can fix the indentation.
- If your file contains several documents separated by ---, the converter returns a JSON array with one entry per document.
- Use "Copy result" to grab the JSON, or "Clear" to start again with a fresh file.
What Is a YAML to JSON Converter?
YAML is the configuration language behind Kubernetes manifests, docker-compose files, GitHub Actions workflows, OpenAPI specs, and Ansible playbooks. It is pleasant to write by hand because indentation replaces braces and quotes, but almost every runtime, test fixture, and HTTP API ultimately wants JSON. A YAML to JSON converter bridges that gap: it reads the indentation-based structure and emits the equivalent object, array, string, number, boolean, or null.
This converter parses your input with the strict JSON schema, so values map cleanly onto JSON types instead of picking up YAML-only tags. Multi-document files — the ones where --- separates several manifests in a single .yml — are parsed document by document and returned as a JSON array, which is exactly what you need when a Kubernetes bundle has to be fed into a script. When the YAML is malformed, you get the parser's reason together with the line and column rather than a silent failure, which usually means a tab character or a mis-aligned list item. Because everything happens client-side, the same page works offline once it has loaded, and configuration that would never be allowed near a third-party server can still be converted in seconds on a locked-down laptop.
Working in the other direction? The JSON to YAML converter turns JSON back into readable YAML. Once you have JSON, the JSON formatter will pretty-print or restructure it, and the JSON validator will confirm the output is syntactically sound before you commit it.
Frequently Asked Questions (FAQ)
How do I convert YAML to JSON online?
Paste your YAML into the input box and click "Convert to JSON". The converter parses the document in your browser and prints the JSON result straight away, with no upload step and no account.
Is this YAML to JSON converter free?
Yes, it is completely free with no signup, no quota, and no watermark. Every conversion runs locally in your browser, so there is no server cost to pass on to you.
Can I convert a .yml file to JSON?
.yml and .yaml are the same format, only the extension differs. Open the file in any editor, copy the contents into the input box, and convert it exactly as you would any other YAML snippet.
How does the tool handle multi-document YAML?
Documents separated by --- are each parsed independently. If the file holds more than one document, the converter returns a JSON array where every element is one document, preserving the original order.
Why does my YAML fail to parse?
The two usual culprits are tab characters (YAML only allows spaces for indentation) and list items that are not aligned with their parent key. The error message names the line and column so you can jump straight to the problem.
Do YAML comments survive the conversion?
No. JSON has no comment syntax, so anything after a # is dropped during parsing. Keep the original YAML if the comments matter, and treat the JSON as a machine-readable export.
Is every YAML file valid JSON once converted?
Structurally yes for ordinary configuration files, because JSON is a subset of YAML. Exotic features such as anchors, custom tags, or non-string mapping keys have no JSON equivalent and may be rejected or flattened.
Is my YAML kept private?
Yes. Parsing happens entirely in your browser using client-side JavaScript. ToolGenie never uploads, stores, or logs the configuration you paste on this page.
Tips for Converting YAML to JSON
- Tip 1: Replace every tab with spaces before you convert. Tabs are the single most common reason a YAML file refuses to parse, and editors often insert them silently.
- Tip 2: Quote version numbers and anything that looks like a date or a boolean. Unquoted 3.10 becomes the number 3.1, and unquoted yes becomes true in many YAML dialects.
- Tip 3: Pick minified output when you are pasting the result into an environment variable, a curl body, or a CI secret; pick 2 spaces when a human has to review the diff.
- Tip 4: Round-trip your config to check nothing was lost: convert here, then use the JSON to YAML converter to go back, and compare the two versions with the text diff checker or tidy the result in the JSON formatter.