Does this convert JSON back to YAML too?

No. This tool converts one way, from YAML to JSON. You paste YAML in the top box and get formatted JSON in the output box. If you need the reverse, use a dedicated JSON to YAML tool.

Is my YAML uploaded anywhere?

No. The conversion runs entirely in your browser with a local YAML parser, so your config and any keys or hostnames inside it never leave your device. It even works offline once the page has loaded.

Why am I seeing an Invalid YAML error?

The parser found a syntax issue, usually a bad indent, a tab where spaces are expected, or a missing colon. The red message names the problem so you can fix that line. YAML is strict about spacing, so check your indentation first.

Does it handle nested objects and lists?

Yes. It uses a full YAML parser, so nested maps, sequences (dash lists), multi-line strings, and anchors all convert correctly. The JSON output is pretty-printed with two-space indentation.

YAML to JSON | JotTools

YAML

JSON

What the YAML to JSON converter does

This tool turns YAML, the indentation-based format used in config files, CI pipelines, Docker Compose, and Kubernetes manifests, into clean JSON. It is handy for developers who need to feed a config into a JSON-only API, debug a .yml file, or just read a nested structure more clearly. Conversion happens as you type, right inside the browser, with no upload step.

How to use it

Paste or type your YAML into the top box labeled YAML. The placeholder shows the expected shape (keys, nesting, and list items with dashes).
Watch the JSON appear in the lower box automatically. There is no button to press for the conversion itself, it updates live with every keystroke.
If your YAML has a syntax problem, a red message tells you what went wrong (for example a bad indent or a stray colon), so you can fix it on the spot.
Press Copy to put the formatted JSON on your clipboard.

The output is pretty-printed with two-space indentation, so it is ready to drop straight into code or a config file.

Why convert YAML here

It is free, needs no account, and works the moment the page loads. Because everything runs locally in your browser using a real YAML parser, your config never touches a server, which matters when the file holds API keys, hostnames, or other private settings. That also makes it instant, even offline once the page is open.

The parser handles nested maps, sequences, multi-line strings, anchors, and the usual YAML quirks, so the JSON you get back matches the structure you wrote. A quick tip: if the result looks wrong, check your indentation first, since YAML cares about spaces and rejects tabs.

This page converts one way, from YAML to JSON. For a single file or a quick snippet it is ideal. If you regularly process large batches of config files, the BulkPro desktop app from the same team is built for that kind of volume.

Frequently asked questions

Does this convert JSON back to YAML too?: No. This tool converts one way, from YAML to JSON. You paste YAML in the top box and get formatted JSON in the output box. If you need the reverse, use a dedicated JSON to YAML tool.
Is my YAML uploaded anywhere?: No. The conversion runs entirely in your browser with a local YAML parser, so your config and any keys or hostnames inside it never leave your device. It even works offline once the page has loaded.
Why am I seeing an Invalid YAML error?: The parser found a syntax issue, usually a bad indent, a tab where spaces are expected, or a missing colon. The red message names the problem so you can fix that line. YAML is strict about spacing, so check your indentation first.
Does it handle nested objects and lists?: Yes. It uses a full YAML parser, so nested maps, sequences (dash lists), multi-line strings, and anchors all convert correctly. The JSON output is pretty-printed with two-space indentation.

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Last updated: June 15, 2026