JSON to YAML Converter

The JSON to YAML Converter turns JSON data into clean YAML in real time as you type or paste, so you can move structured data into config-friendly form without reformatting by hand. The output appears instantly with color-coded syntax highlighting and flexible formatting options.

It is built for developers and DevOps engineers who write or maintain YAML configuration — Docker Compose, Kubernetes, Ansible, GitHub Actions, or any tool that prefers YAML over JSON. Paste a JSON object or array on the left and read the converted YAML on the right.

Private by design: conversion runs entirely in your browser. Your JSON is never uploaded, stored, or sent to any server.

How to Convert JSON to YAML

Enter your JSON

Paste or type JSON into the left panel, or use Upload File to load a .json file. Click Sample Data to drop in an example Kubernetes Deployment and see the tool work.

Read the YAML

The converted YAML appears instantly on the right with syntax highlighting. Invalid JSON is flagged right away, with the error line and column shown so you can fix it fast.

Tune the output

Set the Indent to 2, 4, or 8 spaces, pick a Flow level (Block, 1, or 2), and toggle Sort Keys or Quote Strings until the YAML matches your needs.

Copy or download

Use Copy to send the YAML to your clipboard, or Download to save it as a .yaml file ready to drop into your project.

Features

Real-Time Conversion

JSON is converted as you type, with pasted data processed immediately so the YAML is always in sync with your input.

YAML Syntax Highlighting

Keys, strings, numbers, booleans, null values, and list dashes are color-coded for easy scanning.

Indent Options

Choose 2, 4, or 8 spaces to control how deeply the YAML output is indented.

Flow Level Control

Keep standard Block style, or inline nested objects and arrays from depth 1 or 2 for more compact output.

Sort Keys

Alphabetically order every object key in the YAML output without touching your original JSON.

Quote Strings

Force double quotes around all string values when you need explicit string typing in YAML.

Validation & Error Lines

Invalid JSON is caught instantly, with the line and column reported and the input line highlighted when the position is known.

Upload, Download & Copy

Load a .json file from your device, copy the YAML to your clipboard, or save it as a .yaml file.

Status Bar Stats

A live status bar shows whether your JSON is valid plus the line count, key count, and output size.

Sample Data & Dark Mode

Load a ready-made Kubernetes Deployment to explore the tool, all in a responsive layout with built-in dark mode.

Frequently Asked Questions

How do I convert JSON to YAML?

Paste or type your JSON into the left panel, or upload a .json file. The converted YAML appears instantly on the right, ready to copy or download. There is nothing to install or sign up for.

Why convert JSON to YAML?

YAML is the configuration format of choice for tools like Docker Compose, Kubernetes, Ansible, and GitHub Actions. It is more readable for nested structures, supports comments, and uses a more compact syntax than JSON for the same data.

Can I convert a Swagger or OpenAPI JSON to YAML?

Yes. Any valid JSON works, including Swagger and OpenAPI definitions. Paste the JSON spec and copy or download the YAML version. The nesting and structure are preserved exactly.

What is Flow level?

Flow controls the YAML style. Block (default) produces standard multi-line output with each key on its own line. Setting it to 1 inlines objects from depth 1 and deeper (e.g. {key: value, key2: value2}); 2 inlines from depth 2, keeping top-level keys in block style.

When should I use Quote Strings?

Enable Quote Strings when values could be misread in YAML — for example the text true would otherwise become a boolean and 123 a number. Quoting forces every string value to stay a string.

Does the converter preserve data types and nesting?

Yes. Strings, numbers, booleans, and null map directly to YAML, arrays use dash notation, and objects become key-value pairs. The full nesting and indentation of your JSON are kept intact.

Can I convert YAML back to JSON?

Yes. Use the YAML to JSON Converter to run the reverse conversion whenever you need to go from YAML back to JSON.

Is my data uploaded or processed in the browser?

Everything happens in your browser. Your JSON is never uploaded or stored on a server, so the practical size limit depends on your device's memory — the tool handles files up to several megabytes comfortably, with only a brief delay on very large input.