YAML Viewer
Paste YAML to validate it, tidy the formatting, and convert it to JSON (or back) so you can inspect config files with confidence.
Runs entirely in your browser — nothing is uploaded.
About YAML Viewer
Paste YAML to validate it, tidy the formatting, and convert it to JSON (or back) so you can inspect config files with confidence.
- Validates YAML and reports parsing errors with helpful detail.
- Reformats YAML cleanly and converts between YAML and JSON.
- Ideal for checking CI, Kubernetes and app config files.
YAML Viewer is part of Upwwards Tools, a free collection of browser-based utilities built by the team at Upwwards. Like the rest of the suite, it's free, requires no sign-up, and keeps your data on your device.
Frequently asked questions
What is YAML Viewer?
Paste YAML to validate it, tidy the formatting, and convert it to JSON (or back) so you can inspect config files with confidence.
Is YAML Viewer free to use?
Yes — YAML Viewer is completely free with no sign-up, account or usage limits. It is part of the free Upwwards Tools collection built by Upwwards.
Is my data private when I use YAML Viewer?
YAML Viewer runs entirely in your browser. Everything you enter or upload is processed locally on your device and is never sent to a server, stored or logged.
Do I need to install anything to use YAML Viewer?
No. YAML Viewer works instantly in any modern web browser on desktop or mobile — there is nothing to download or install.