JSON to YAML Converter

JSON TO YAML CONVERTER

JSON to YAML Converter

This JSON to YAML Converter turns a valid JSON object, array, or scalar into readable YAML in your browser. JSON is a reliable machine format built around braces, brackets, and quoted keys. YAML uses indentation and a simpler visual style, which makes configuration files and documentation easier for people to scan.

The conversion is a serialization step, not a data rewrite. Strings remain strings, numbers remain numbers, booleans remain booleans, and JSON null is emitted as YAML null. Nested objects and arrays stay nested, and keys remain in their original order. The generated text can be copied into a configuration file or downloaded as .yaml or .yml.

Everything happens locally. The page does not upload your JSON, call a conversion API, send content to analytics, or use AI to repair input. If the source is invalid, the validator explains the syntax problem so you can fix the original document yourself.

HOW TO CONVERT JSON TO YAML

How to convert JSON to YAML online

1. Paste a JSON document or choose a local .json file. Drag and drop is supported too.
2. Click Validate JSON. The page reports a nearby line and column when the browser exposes a character position.
3. Choose 2-space or 4-space indentation. The default is 2 spaces, a common choice for compact configuration files.
4. Optionally enable Add document marker (---) when the consuming tool or team convention expects an explicit YAML document start.
5. Review the read-only YAML preview, including its line count and current settings.
6. Copy the complete YAML or download the same content with either a .yaml or .yml extension.

There is no array selector because JSON to YAML preserves the whole validated value. Unlike a table export, the converter should not guess which branch of an object is the “main” dataset or discard metadata next to it.

JSON ARRAY TO YAML

Convert JSON arrays to YAML

Arrays become YAML sequences. A simple JSON array such as ["apple", "banana", "orange"] is written as a readable list with one dash per item. An array of objects keeps each object as a sequence item, preserving the relationship between fields without turning it into columns.

- name: John
  age: 30
- name: Jane
  age: 28

Nested arrays remain nested at the same position in the structure. This is useful for permissions, feature flags, menu items, environment lists, and other configuration data where hierarchy carries meaning. The serializer handles quoting and special characters instead of relying on a hand-written indentation routine.

NESTED JSON TO YAML

Convert nested JSON to YAML

Nested objects are where YAML often becomes easier to read than JSON. Given {"user":{"name":"John","settings":{"theme":"dark"}}}, the output uses indentation to show the same path:

user:
  name: John
  settings:
    theme: dark

Indentation is structural in YAML, so the selected 2-space or 4-space setting is applied consistently throughout the document. The page does not offer a flattening switch because flattening would change the shape users came to preserve. It also does not sort keys; the order from the JSON input remains the order in the YAML output.

Empty strings, Unicode characters, quotes, line breaks, booleans, numbers, and null values are passed to the mature YAML serializer. That library decides when quoting is necessary for valid, unambiguous YAML rather than exposing a risky manual quote mode.

CONFIGURATION FILES

JSON to YAML for configuration files

YAML is common in application configuration, DevOps settings, CI/CD variables, deployment parameters, documentation examples, and local development tools. Converting an existing JSON configuration can make a review easier because nesting is visible without a screen full of braces.

This page only serializes data. It does not validate Kubernetes manifests, check a vendor schema, generate deployment resources, or guarantee that a target application accepts every key. After conversion, use the documentation and validator for the system that will consume the YAML. Keep the original JSON when you need a reversible source-of-truth workflow.

The optional --- marker identifies the beginning of a YAML document. It is useful when your repository convention expects it, but it is not required for ordinary single-document YAML. V1 deliberately stays focused on one document and does not add multi-document editing, comments, anchors, aliases, or custom tags.

JSON AND YAML

JSON vs YAML: which format should you use?

Neither format is universally better. JSON is strict and predictable for APIs. YAML is often more comfortable to edit by hand, but indentation mistakes can change meaning. If you need spreadsheet-ready rows, use the JSON to Excel Converter or the lightweight JSON to CSV Converter instead.

FILE EXTENSIONS

.json vs .yaml vs .yml

.json identifies the original JSON format. .yaml and .yml are both common extensions for YAML files and contain the same language; the preferred spelling usually comes from the project or tool that will read the file. This converter downloads identical content under either extension so you can follow that convention without changing the data.

Choose a descriptive base name when you save a file. If you upload config.json, the page suggests config.yaml and config.yml. When you paste JSON without a file name, the default is converted.yaml.

PRIVATE LOCAL PROCESSING

Convert JSON to YAML without uploading your data

Your JSON never leaves your browser. Parsing, validation, serialization, preview, copy, and download are client-side actions. The page does not put source content in a URL, localStorage entry, analytics event, console log, or server request.

Local processing is a practical privacy feature for configuration data, internal development values, customer-shaped test fixtures, and other content you do not want to paste into an unknown online converter. It is not an absolute security guarantee: protect your device, browser session, and any YAML file you save according to your own policies.

For a printable handoff, the JSON to PDF Converter prepares a local report through the browser's print flow. Use that when presentation matters more than preserving an editable configuration structure.

TROUBLESHOOTING

Common JSON to YAML problems

An empty input shows “Paste or upload JSON to get started.” A malformed document may contain a missing comma, an unclosed quote, a trailing comma, an extra bracket, a comment, or an unquoted property name. The validator reports the syntax issue when it can locate one; it never silently changes the source.

If the YAML looks different from what you expected, check the original JSON types first. A JSON string containing 2026-01-01 is still a string; the serializer may quote values whose plain form could be interpreted as another YAML type. A JSON null remains null, not a deleted key or empty string.

Very large input can take longer in a browser because the complete value must be parsed and serialized in memory. The page does not truncate the output. If a file is too large for a responsive browser tab, split it or use a local script.

FAQ

Frequently asked questions about JSON to YAML