Convert JSON to YAML Online — json2yaml Converter
Paste or upload JSON and the converter parses it, then emits a YAML document with clean 2-space indentation that mirrors the original tree. Nested objects become YAML maps, arrays become block sequences, and every JSON primitive type is mapped to the equivalent YAML scalar so the data round-trips faithfully.
This is the tool for turning a JSON API response into a readable config file, generating Kubernetes or Docker Compose YAML from a programmatic source, converting OpenAPI JSON to its YAML variant, or porting fixtures from one format to another for a codebase that prefers YAML. It is also useful for code review — YAML is often easier to read in a PR than the equivalent JSON blob.
Edge cases are handled sensibly: strings that contain special characters (colons, dashes, leading numbers, YAML reserved words like yes/no/on/off) are quoted automatically, multi-line strings use the literal block style, null becomes an explicit null, and deeply nested structures stay aligned without drift. If your JSON root is a primitive rather than an object or array, a type warning surfaces so you know the output is a single scalar.
All parsing and emission runs in your browser — the JSON never leaves the tab and no server sees your data.
About JSON to YAML conversion
Transform JSON data into clean, human-readable YAML. Perfect for creating configuration files from JSON API responses or converting between data formats.
- Clean 2-space indentation
- Handles nested objects, arrays, and all JSON types
- Primitive values converted with type warnings
- Upload JSON files directly
100% client-side. Your inputs never leave your browser. Ads via AdSense (consent required).
Frequently asked questions
How do I convert JSON to YAML?
Paste JSON and the converter emits YAML 1.2 with proper indentation, block-style mappings and sequences by default. Types are preserved: numbers, booleans and nulls are written in YAML's native syntax (true/false/null, not quoted), strings are quoted only when necessary. You can tweak indent width and choose between block and flow style for compact arrays. The output is ready to drop into Kubernetes, Ansible or any YAML-aware tool.
Is the JSON to YAML converter free?
Yes, fully free with no signup, no size cap beyond browser memory. Convert as often as you need — it's common to run JSON to YAML repeatedly when iterating on Helm values or GitHub Actions workflows. JSONCraft has no premium tier; every converter is open at full capability, including this one.
Does the converter upload my JSON?
No. Parsing and YAML emission run entirely in your browser. Nothing is sent to a server — relevant when your JSON is an API response, a secrets bundle or a deployment config. You can safely convert sensitive payloads; there is no history, no account and no logging.
How are strings with special characters handled?
Strings containing YAML-significant characters (colons, dashes, hashes at start, multiline content) are automatically quoted or block-escaped so the output remains valid. Keys that look numeric or boolean are quoted to avoid accidental retyping when re-parsed. Control characters and non-printable bytes are escaped. The result round-trips through the YAML to JSON converter cleanly.
When should I use YAML over JSON for config?
YAML wins when humans maintain the file: it allows comments, is less punctuation-heavy and reads cleanly at depth. JSON wins when machines exchange it: it's unambiguous, universally supported, and has no surprising type coercion (YAML famously parses 'no' as false). Use this converter when you have machine-generated JSON that a human now needs to edit, or the reverse.