What does this tool do?
This tool instantly converts your YAML documents into valid JSON output. It accurately maps YAML's indentation-based structure, key-value pairs, lists and nested objects into JSON. The entire conversion runs in your browser, so your data is never sent to any server.
How to use it
- Paste or type your data into the left field.
- The result is generated instantly on the right.
- Use the Copy button to grab the output.
Why convert YAML to JSON
YAML is loved for human-friendly configuration files, but most APIs, JavaScript runtimes and data pipelines expect JSON. Converting bridges that gap: you can author readable YAML for your CI/CD configs or Kubernetes manifests, then export JSON when a tool or endpoint demands it. JSON is natively parseable in virtually every programming language without an extra dependency, making it the safer choice for machine-to-machine exchange. This converter lets you keep your preferred authoring format while still producing portable, standards-compliant output.
Common conversion pitfalls
YAML requires spaces, never tabs, for indentation, and mixed indentation triggers parse errors. Values like 'yes', 'no' and 'on' may auto-coerce into booleans in some parsers, so quote them if they must stay strings. Because JSON has no comment syntax, any '#' comments in your YAML are dropped from the output. Anchors and aliases get expanded into their resolved values. Keeping these rules in mind helps you predict exactly what the resulting JSON will contain.
Frequently asked questions
Are my YAML comments kept in the JSON output?
No. JSON does not support comments, so every '#' comment line in your YAML is stripped during conversion. Only the actual data is carried over into the JSON result.
Can I convert a multi-document YAML file?
YAML files split by the '---' separator contain several documents that cannot map directly to a single JSON object. You would convert each document separately or treat the set as a JSON array of objects.
Is the output pretty-printed or minified?
By default the tool produces indented, readable JSON. You can copy the result and minify it in your application, or paste it straight into your config file as is.
Is YAML → JSON free?
Yes. YAML → JSON and all 300+ tools on MagmaNex are completely free with no signup or account required.
Is my data safe?
Yes. Everything runs locally in your browser. The data you enter is never sent to a server, stored, or shared.
Does it work on mobile?
Yes. YAML → JSON works on phones, tablets and desktops — no app download needed.
🔒 Privacy: everything runs in your browser, your data is never sent to a server.