Free JSON to YAML Online

JSON is the lingua franca of APIs. YAML is what most modern infrastructure tools expect for their config files — Kubernetes manifests, GitHub Actions workflows, Docker Compose files, Ansible playbooks, OpenAPI specs. Sooner or later you have a JSON object and you need it in YAML, or vice versa, and rewriting it by hand is exactly the kind of mechanical task that wastes an hour and introduces a typo. Our free online JSON to YAML converter does the round trip cleanly. Paste JSON into the input pane, see the equivalent YAML appear immediately in the output pane (or paste YAML and switch the direction). The converter handles all the tricky cases that bite hand-translation: nested objects becoming indented blocks, arrays becoming dash-prefixed lists, strings that need quoting because they contain special characters or look like booleans (`yes`, `no`, `on`, `off` are all gotchas in YAML 1.1), strings with leading whitespace, multi-line strings that need the `|` or `>` block scalar syntax, and integers that should not become floats. Real-world workflows: turning a JSON config file into a Kubernetes ConfigMap entry, converting an OpenAPI JSON spec into the YAML format that Swagger Editor likes, taking an API response and pasting it into a GitHub Actions matrix definition, or migrating a Node.js project's JSON config to a YAML equivalent for human readability. Both directions run locally in your browser — no upload, no signup, no daily limit. After converting, the [JSON Formatter](/tools/json-formatter) is the right place to validate and prettify the JSON side, and the [Code Beautifier](/tools/code-beautifier) handles indentation cleanup if you need to embed the result inside a larger config file.