# YAML to JSON: convert config files free, in your browser

> Paste YAML on one side, get JSON on the other, and keep the file on your own machine.

URL: https://claudegpt.si/news/yaml-to-json-converter-ayetab  
Published: 2026-10-27T15:07:56.438Z  
Author: ClaudeGPT Si Newsroom  
Section: Guides  
Topics: YAML, JSON, Developer tools  
Publisher: ClaudeGPT Si

## Key takeaways

- The AyeTab YAML to JSON tool converts in both directions, free and without an account.
- Parsing happens inside the browser tab, so config files are not uploaded to AyeTab servers.
- YAML comments are dropped in JSON, and unquoted words like no or off can turn into booleans.

To convert YAML to JSON, paste the YAML into a converter that parses it and writes the same data back out as JSON objects and arrays. The free [AyeTab YAML to JSON tool](https://app.ayetab.com/tools/yaml-json) does this in your browser tab, works in both directions, and never uploads what you paste.

## Why you end up converting YAML to JSON

YAML is the format people write by hand: Kubernetes manifests, GitHub Actions workflows, Docker Compose files, OpenAPI specs. JSON is the format programs pass around: API bodies, `package.json`, JSON-LD, most configuration that a script reads. Sooner or later the two meet. A typical day might include:

- pasting part of a Helm values file into a request that only accepts JSON
- feeding an OpenAPI spec written in YAML to a tool that wants JSON
- checking how a YAML file actually parses, because indentation hides mistakes
- turning a JSON response into YAML so it fits next to the rest of your config

## How the AyeTab converter works

Open the tool and you get two panes side by side, one labelled YAML and one labelled JSON. Paste into the YAML side and the JSON appears on the other; paste JSON and you get YAML back. Each pane has a copy button, so the round trip takes a few seconds.

The details that matter for daily use:

| What you get | Details |
| --- | --- |
| Price | Free, no signup, no watermark on the output |
| Privacy | Parsing happens locally, input is not sent to AyeTab servers |
| Offline | Keeps working once the page has loaded |
| Directions | YAML to JSON and JSON to YAML |
| Where | The web app, or the AyeTab Chrome extension on your new tab |

## Three YAML habits that surprise people in JSON

Converting is the easy part. The output sometimes differs from what you expected, and the cause is nearly always YAML itself.

**Unquoted words that become booleans.** Parsers that follow YAML 1.1 read values such as `yes`, `no`, `on` and `off` as true or false. A country code list with `NO` for Norway can turn into `false`. Quote strings that look like booleans.

**Comments disappear.** YAML allows `#` comments. JSON has no comment syntax, so any converter drops them. Keep the YAML as your source of truth if the comments carry meaning.

**Indentation decides structure.** One extra space can move a key into the wrong object. Looking at the JSON output is a quick way to see the structure the parser really built, with braces instead of whitespace.

## Why a local converter is the safer default

Config files are rarely harmless. They hold database hosts, internal service names and sometimes credentials someone forgot to move into a secret store. Pasting that into a website can send it to that site's server. AyeTab parses the text inside the browser tab, so the file stays on your machine, and there is no account to create.

When a script or CI job has to do the conversion, a command-line tool such as yq is the better choice: it runs in a pipeline, handles files in bulk and needs no browser. For the quick, one-off check while you work, the browser tool is faster.

## Get it on every new tab

The [AyeTab extension for Chrome](https://ayetab.com) replaces the new tab page with the same set of developer tools and adds a side panel. Press Ctrl+K or Cmd+K to open the command palette and jump to the YAML converter by name, or star it so it sits at the top of your list. Smart paste suggests a tool for what you paste, and the extension works offline once installed.

## FAQ

**Is the AyeTab YAML to JSON converter free?**
Yes. There is no signup, no usage cap in the product and no watermark.

**Does it convert JSON to YAML too?**
Yes. Paste JSON into the JSON pane and the YAML version appears in the other pane.

**Is my YAML uploaded anywhere?**
No. The conversion runs locally in your browser, and the page keeps working offline after it loads.

## Frequently asked questions

### Is the AyeTab YAML to JSON converter free?

Yes. There is no signup, no usage cap in the product and no watermark on the output.

### Does it convert JSON to YAML too?

Yes. Paste JSON into the JSON pane and the YAML version appears in the other pane.

### Is my YAML uploaded anywhere?

No. The conversion runs locally in your browser, and the page keeps working offline after it loads.

## Sources

- [YAML to JSON Converter Online: Free](https://app.ayetab.com/tools/yaml-json), AyeTab
- [AyeTab: Developer utilities](https://ayetab.com), AyeTab
- [AyeTab: Developer Utilities](https://chromewebstore.google.com/detail/hfcgbpmgokbjeiblnheamfdfbochlaah), Chrome Web Store
- [Boolean type for YAML 1.1](https://yaml.org/type/bool.html), yaml.org
- [yq](https://github.com/mikefarah/yq), GitHub