JSON to YAML
Convert JSON documents to clean, indented YAML instantly in your browser. Reports the exact line and column of invalid JSON.
Clean, Indented Output
Produces readable YAML with consistent indentation, not a raw dump.
Handles Large Documents
Converts JSON up to 50MB without freezing the page.
Local Processing
Your data never leaves your browser. Privacy first conversion.
How to Convert JSON to YAML
- Paste valid JSON into the input pane — invalid JSON is reported with the exact line and column instead of converting garbage.
- Click Convert.
- Clean block-style YAML appears in the output pane.
- Copy it into your Kubernetes manifest, CI pipeline, or application config.
Example: A Service Config as YAML
Input — JSON
{"service":"payments","replicas":3,"env":{"region":"eu-west-1","debug":false},"ports":[8080,9090]}Output — YAML
service: payments replicas: 3 env: region: eu-west-1 debug: false ports: - 8080 - 9090
Strings stay unquoted when YAML allows it, nesting becomes 2-space indentation, and arrays become dash lists — the style you see in real-world Kubernetes and CI configs.
Types survive the trip
The conversion is data-to-data, not text substitution: numbers stay numbers, booleans stay booleans, and null stays null in the YAML output. Strings that could be misread as other types get quoted automatically by the serializer, so the YAML parses back to exactly the values your JSON contained.
Why convert to YAML at all
Most infrastructure tooling — Kubernetes, GitHub Actions, docker-compose, OpenAPI — is configured in YAML, while most APIs and programs emit JSON. Converting mechanically beats re-typing by hand, where a missed indent level or a forgotten dash produces configs that parse but mean something different.
Frequently Asked Questions
No — a JSON array always becomes a single YAML sequence (a list under one document), never multiple --- separated documents. Multi-document YAML has no equivalent concept in JSON, so this conversion only ever produces one document; the reverse direction (YAML to JSON) does handle multi-document YAML input, converting it into a JSON array, but that is intentionally a one-way capability.
As null, [], and {} respectively — null stays the literal word null, and empty arrays/objects use YAML's compact flow style ([] and {}) rather than being expanded across multiple lines, since there is nothing to indent.
Because the error is caught at the JSON-parsing step, before YAML conversion even starts, and this tool reuses the same precise error-location logic as the JSON tools — locating the exact character the parser failed on rather than reporting a generic message.
No. The conversion runs entirely in your browser — nothing you paste here is ever transmitted anywhere, so it works the same whether you are online or not.
No — JSON is parsed into JavaScript numbers first, which don't distinguish 2 from 2.0, so both convert to the same YAML number. If you need to preserve trailing zeros or specific numeric formatting, that information is lost the moment the JSON is parsed, before conversion even begins.
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