What is the difference between YAML and JSON?

YAML is an indentation-based data format that expresses the same structures as JSON but reads more like prose. It supports comments, which JSON does not, and is the usual choice for CI configuration and Kubernetes manifests. JSON is a plain-text data format that stores nested objects and arrays. It is the standard payload format for web APIs, readable in any text editor, and parsed natively by every major programming language.

Will I lose anything converting YAML to JSON?

The data comes across exactly. Comments do not — JSON has no comment syntax, so anything annotated in the YAML is dropped permanently. If the comments matter, keep the YAML as your source of truth and treat the JSON as a build artefact.

Anything to watch out for with JSON?

JSON has no comment syntax. Anything stripped from a JSONC or JSON5 source is gone. JSON numbers are IEEE 754 doubles — integers beyond 2^53 lose precision silently.

How is nested data handled?

JSON represents nesting directly, so the structure of your YAML is preserved as-is.

What should I know about starting from YAML?

Comments do not survive a round-trip through JSON. Converting YAML to JSON and back loses them permanently. More broadly: YAML is a human-first data format that encodes the same object-and-array model as JSON using indentation instead of braces. It is the standard for CI pipelines, Kubernetes manifests and application config, largely because it supports comments and reads cleanly in a diff.

When is JSON the right choice?

JSON suits: aPI request and response payloads; configuration files that need nesting; anything consumed directly by JavaScript. It is the wrong choice when very large tabular datasets, where the repeated keys dominate the file size.

Is there a file size limit?

No hard limit — the constraint is your browser's memory. Files under 50MB convert in a few seconds. Larger files work but take longer, and a browser tab typically has 250-500MB to play with, so very large batches are better split into smaller groups.

Does this work on mobile?

Yes. The drop zone falls back to your phone's file picker, and the conversion runs on-device exactly as it does on desktop. Large files are slower on a phone because there is less CPU and memory available, but nothing about the workflow changes.

Convert YAML to JSON

Convert YAML config to JSON for tools that only accept JSON. Comments are not carried across. Free, in your browser, no upload.

Drop data files to convert

JSON, YAML, XML, CSV, Parquet

Files stay on your device. Open DevTools' Network tab to verify.

Overview

Why convert YAML to JSON

JSON is the more practical choice here. API request and response payloads

Comparison

YAML vs JSON: what actually differs

YAML compared with JSON across encoding, fidelity, file size and support.
Attribute	YAML	JSON
Full name	YAML Ain't Markup Language	JavaScript Object Notation
Encoding	Text — editor-readable	Text — editor-readable
What it preserves	Same data model as JSON, plus comments and anchors	Preserves nesting and value types exactly
Typical size	Compact — no braces, no quotes on most scalars	Verbose — keys repeat on every record
Support	Ubiquitous in DevOps tooling; libraries exist for every language.	Native in every programming language and every browser.

How to

How to convert YAML to JSON

01
Drop your YAML file
Drag one or more YAML files onto the drop zone above, or click to browse. Files stay on your device — there is no upload step. data formats can't be reliably identified from their bytes alone, so the extension is used to work out the source format.
02
Convert to JSON
convert.now parses the YAML and writes it out as JSON in a Web Worker, so the page stays responsive even on large files. Nothing is sent anywhere.
03
Download the result
Download the JSON file, or a zip of all of them for a batch. Filenames are preserved, with the extension changed to .json.

Why here

Why convert.now

Private
Files stay in your browser. No upload step. Nothing for anyone to see.
Fast
No queue, no upload wait. Conversion starts the moment you drop a file.
Free
No ads. No file-count limit. No sign-up wall. Just the converter.

FAQ

YAML to JSON: common questions

No. The YAML to JSON conversion runs entirely in your browser. Files never leave your device, and there is no server involved in the conversion at all. Open DevTools' Network tab and run a conversion if you want to confirm it — you will see the page and its code load, and no request carrying your file.

Related YAML converters

Last updated 27 August 2026

Why convert YAML to JSON

YAML vs JSON: what actually differs

How to convert YAML to JSON

Drop your YAML file

Convert to JSON

Download the result

Why convert.now

YAML to JSON: common questions

Related YAML converters