Developer Tools
YAML ⇄ JSON Converter
Convert YAML to JSON and JSON to YAML in both directions, with validation and exact error locations. Handles anchors, multi-line strings and deeply nested structures — perfect for Kubernetes manifests, Docker Compose and CI configs. Everything runs in your browser; your data is never uploaded.
Move between YAML and JSON without losing structure
YAML is friendly for humans — Kubernetes, GitHub Actions, Docker Compose and Ansible all speak it — while JSON is what most APIs and programs expect. Converting between them by hand is fiddly and easy to get wrong with indentation. This converter does it instantly, both ways, and tells you exactly where the syntax breaks.
What it handles
- Both directions — YAML → JSON and JSON → YAML with one toggle.
- Full YAML — anchors, aliases, flow and block styles, multi-line scalars, typed values.
- Validation — clear errors with the failing line and column.
- Clean output — configurable indent and optional alphabetical key sorting for stable diffs.
- Private — everything runs locally; manifests and secrets never leave your browser.
Frequently asked questions
How do I convert YAML to JSON?
Paste your YAML on the left with YAML → JSON selected and the JSON appears instantly. The converter parses your YAML (including anchors, aliases, multi-line blocks and typed scalars), then serializes it as pretty-printed JSON you can copy or download.
How do I convert JSON to YAML?
Switch the toggle to JSON → YAML and paste your JSON. The tool parses it and emits clean, indented YAML. You can choose the indent width and optionally sort keys alphabetically for stable diffs.
Does it validate my YAML or JSON?
Yes. Invalid input is reported with a clear message and, for YAML, the line and column where parsing failed — so you can fix a stray tab, bad indent or duplicate key quickly.
Is my data uploaded anywhere?
No. Parsing and conversion run entirely in your browser with JavaScript. Your YAML and JSON never leave your device, so it is safe for Kubernetes manifests, CI configs and other private files.
Why do YAML comments disappear after converting?
JSON has no concept of comments, so converting YAML → JSON necessarily drops them. Converting back JSON → YAML cannot restore comments either. Keep the original YAML if you need its comments.