Skip to content
Conversion Hub

json → yaml

Convert JSON to YAML Online

Convert JSON to clean YAML, with indentation you control and instant validation.

  • No uploads, ever
  • Converts in milliseconds
  • Works offline
  • Batch support

YAML is a superset of JSON, and for configuration files it is far easier to read: no braces, no quotes around every key, and comments that are actually allowed. This converter turns JSON into tidy YAML as you type, with a choice of two- or four-space indentation to match whichever convention your project follows. Everything runs locally, so configuration containing credentials never leaves your machine.

100% client-side — your files never leave your device

Conversion runs locally in your browser using Canvas and WebAssembly. There is no upload step, no server processing and no file storage. Disconnect from the internet and this page still works.

Loading converter…

Step by step

How to convert JSON to YAML online

  1. Add your .json file

    Drag and drop your file into the box above, or click it to browse your device. Add several at once and they convert together as a batch.

  2. Choose your output settings

    Pick 2 or 4 space indentation to match your project’s convention. The output updates as you type.

  3. Download the .yaml

    Click Download to save the result straight to your device. The whole process took a fraction of a second because nothing was uploaded or downloaded.

Side by side

JSON vs YAML

Here is how the two formats differ. Use it to decide whether converting is worth it, and which one to pick if you have a choice.

Comparison of JSON (JavaScript Object Notation) and YAML (YAML Ain’t Markup Language)
AttributeJSON.jsonYAML.yaml
Full nameJSON (JavaScript Object Notation)YAML (YAML Ain’t Markup Language)
CompressionText-basedText-based
TransparencyNoNo
Browser supportUniversalUniversal
File sizeTextText
Best forAPIs, configs and web appsReadable config and CI pipelines

The guide

Getting the most out of JSON to YAML conversion

Why prefer YAML for configuration

A JSON config is dense and unforgiving: one missing comma invalidates the whole file, and every string needs quotes. YAML removes the punctuation entirely, so a deployment config reads like the structure it describes. It also supports comments, multi-line block scalars, anchors and environment-specific merges — none of which JSON can express. The trade-off is that YAML has a meaningful subset of edge cases where different parsers disagree, so round-tripping through a strict parser such as the one used here is worth doing before you commit.

How YAML represents JSON types

YAML has richer types than JSON: null, booleans, integers, floats, dates and strings are all inferred from unquoted scalars. This converter quotes strings where ambiguity could arise, so a value like `"yes"` or `"123"` survives the round trip as a string rather than becoming a boolean or a number. Multi-line strings are emitted as block scalars, which keeps certificates, keys and long descriptions readable instead of turning them into a single unwieldy line.

Converting back without surprises

Because YAML is a superset of JSON, the reverse conversion is lossless for the JSON subset. The one thing to watch is ordering: YAML preserves the order in which keys appear, and so does the JSON output, so you will not see your object reshuffled. If you need alphabetically sorted keys for a stable diff, enable the sort option and the output becomes deterministic.

Common questions

Frequently asked questions

Everything about how this converter handles your files, and how to get the best result.

Is the conversion lossless?
Yes, for the JSON subset of YAML. Objects, arrays, strings, numbers, booleans and null all round-trip unchanged. YAML additionally supports richer types such as dates and anchors, which JSON cannot express.
Which indentation should I choose?
Two spaces is the most common convention and is what Kubernetes, Ansible and most cloud tooling expect. Choose four spaces if your project or editor is configured that way. The setting applies to every nested level.
Will my strings stay strings?
Yes. Values that YAML would otherwise misinterpret as another type, such as "yes", "no", "on", "123" or a date, are quoted automatically so they survive the round trip as strings.
Do you store my configuration data?
Nothing is stored, because nothing is transmitted. The conversion runs in your browser tab, so a config containing API keys or database URLs stays entirely local.