Convert JSON to YAML online, free. JSON is the dominant data-interchange format for web APIs and config. YAML is an indentation-based superset of JSON favoured for human-edited config. JSON to YAML conversion parses your JSON against the ECMA-404 / RFC 8259 grammar (https://www.rfc-editor.org/rfc/rfc8259), builds an in-memory model of its keys, nested objects and arrays, then re-serializes it as valid YAML following the YAML 1.2.2 conventions. Processing runs in your browser in JavaScript with no upload or server round-trip — no size limit beyond your device's memory, so multi-megabyte documents convert in milliseconds and sensitive payloads never leave your machine. Typical uses include Kubernetes & Docker Compose manifests, CI/CD pipelines and Ansible playbooks.
It maps the full structure of your JSON onto well-formed YAML, following the YAML 1.2.2 conventions. 100% free, no registration, and complete privacy — everything runs locally in your browser, so your data never touches a server.
Paste JSON and convert YAML immediately. Conversion runs client-side, so there is no upload wait and large documents stay fast.
Nested JSON objects, tables and arrays are mapped faithfully onto YAML.
Your JSON never leaves your device — everything is processed locally in JavaScript, with nothing logged or stored.
Unlimited conversions with no account, no quotas, and no watermark. Works on desktop and mobile.
A JSON document and its YAML equivalent:
JSON input:
{
"name": "Alice",
"age": 30,
"email": "[email protected]"
}Output:
name: Alice
age: 30
email: [email protected]Paste your JSON into the editor and press "Convert to YAML". The tool parses it against the ECMA-404 / RFC 8259 grammar, then re-serializes it as YAML following YAML 1.2.2 conventions — instantly and entirely in your browser. You can validate or format the JSON first to be sure it is clean.
JSON already uses objects, arrays and typed scalars, so mapping to YAML is close to one-to-one: objects become nested structures, arrays become lists, and numbers, booleans and null keep their types.
Numbers, booleans and null are preserved as native YAML types wherever YAML supports them, so standard documents convert losslessly and can be read back into the same structure.
JSON (JavaScript Object Notation) (JSON) — JSON is the dominant data-interchange format for web APIs and config. YAML (YAML Ain't Markup Language) (YAML) — YAML is an indentation-based superset of JSON favoured for human-edited config. This converter maps the structure of your JSON onto YAML so you can use it for Kubernetes & Docker Compose manifests.
Yes. Invalid JSON is flagged with a clear error before anything is converted. Common JSON problems to check are matched braces and brackets, double-quoted keys, and no trailing commas. Starting from clean input keeps the generated YAML accurate.
Yes. The entire JSON-to-YAML conversion runs locally in your browser in JavaScript — your JSON is never uploaded, logged or stored. That matters when the data is something like REST/GraphQL API payloads, which should not leave your machine.
The generated YAML is ready for Kubernetes & Docker Compose manifests, CI/CD pipelines and Ansible playbooks. Copy or download it and drop it straight into your tooling.
This tool allows you to quickly convert JSON to YAML format. Simply paste your JSON structure on the left, and the tool will automatically generate the corresponding YAML on the right. You can then copy the YAML output and use it directly in your project. Although the tool makes intelligent assumptions for an accurate conversion, we recommend reviewing the output for accuracy. Whether you're dealing with configuration files or need to serialize data, this tool helps streamline the process.
{"name": "Alice", "age": 25, "email": "[email protected]"}This would be converted to YAML as:name: Alice age: 25 email: [email protected]
Let's see how this tool works with a real example. Suppose you have the following JSON data:
{"name": "Alice", "age": 25, "email": "[email protected]"}After pasting this JSON into the tool, the corresponding YAML output would look like this:
name: Alice age: 25 email: [email protected]
As you can see, the YAML format is much cleaner and easier to read, especially for configuration files and data that will be edited manually.
Let's consider a real-world scenario where you need to convert JSON to YAML. Imagine you're working with a project that requires configuration data in YAML format, such as setting up a Kubernetes deployment. Instead of manually creating a YAML file from JSON, you can use this tool to convert it automatically:
{"apiVersion": "apps/v1", "kind": "Deployment", "metadata": {"name": "nginx-deployment"}, "spec": {"replicas": 3, "template": {"metadata": {"labels": {"app": "nginx"}}, "spec": {"containers": [{"name": "nginx", "image": "nginx:1.14.2"}]}}}}After conversion, this would become:
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
spec:
replicas: 3
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.14.2As you can see, YAML's indentation-based structure is easy to read and work with, especially for nested configuration settings like this one.
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