Convert YAML to JSON

Convert YAML to JSON online: paste your data or drop a file and get structured JSON for APIs, JavaScript and configuration instantly. Everything runs in your browser.

Your file never leaves your device.

How to convert YAML to JSON

Developers, analysts and marketers move data between YAML and JSON constantly. This converter parses the YAML with a strict, standards-compliant parser and produces structured JSON for APIs, JavaScript and configuration. You can paste text straight from your editor or clipboard, preview the result and download it, without sending your data to a server.

Step 1: Choose your YAML file
Drop a .yaml, .yml file onto the converter, pick it from your device, or paste the YAML text directly.
Step 2: Check the preview
The JSON output appears immediately so you can verify it before saving.
Step 3: Download the JSON
Save each result individually, or download everything as a single ZIP when you convert several files.

Good to know

Multi-document YAML files (separated by ---) are converted as a list of documents.
Numbers and booleans are typed correctly instead of being kept as strings.
Invalid input is reported with a clear error instead of producing a broken file.

Why use this YAML to JSON converter?

Paste text or upload a file, whichever is faster.
Strict parsing with clear error messages.
Standards-compliant JSON output with correct escaping.
Private by design: data never leaves your browser.

Is it free?

Yes. Converting YAML to JSON is free, with no watermark, signup or email required. Local conversions have no artificial file-size or daily cap; the practical limit is your device.

Is my file uploaded?

The YAML file is processed entirely in your browser. It is never uploaded, never stored and never seen by anyone, so this is safe for confidential files.

About the formats

What is YAML?

YAML is a text format for structured data that relies on indentation instead of brackets or tags, which makes it easy to read and write by hand. It supports lists, key-value maps, comments and multi-line strings, and is largely a superset of JSON. It is widely used for configuration in tools such as Docker Compose, Kubernetes and CI pipelines.

Use YAML for configuration files that people edit by hand, where comments and readability matter. Be careful with indentation, since a misplaced space changes the meaning. For data exchanged between programs, JSON is stricter and less error-prone.

YAML (YAML Ain't Markup Language)

What is JSON?

JSON (JavaScript Object Notation) is a lightweight format for storing and exchanging data as collections of key-value pairs. It grew out of JavaScript but is now supported by nearly every programming language. JSON is the de facto standard for APIs, configuration files and structured data.

Use JSON when machines exchange data, REST APIs, web apps, configuration and tool settings. Its predictable structure makes it easy to parse, so it is the natural choice whenever data needs to be read by software.

JSON (JavaScript Object Notation)

Frequently Asked Questions

Is YAML to JSON conversion free?

Yes. It is free, with no watermark, signup or email required. Local conversions have no artificial file-size or daily cap; the practical limit is your device.

Is there a size limit for YAML to JSON?

Local conversions have no fixed file-size cap; the practical limit is your device's available memory. Because everything runs locally, speed depends on your device.

Is it safe to convert yaml to json here?

Yes. The work happens on your own device with WebAssembly and browser APIs, so the file is not uploaded at all. You can even disconnect from the internet once the page has loaded.

Do I need to install anything?

No. Everything runs in a modern browser (Chrome, Edge, Firefox or Safari) on Windows, macOS, Linux, Android and iOS. There is no app, plugin or account.

Can I convert JSON back to YAML?

Yes, there is a dedicated JSON to YAML converter linked in the related tools below. Keep in mind that information dropped in one direction cannot always be restored in the other.

Need the opposite? Convert JSON to YAML

DataProcessed locally