Convert between JSON and YAML formats. Bidirectional, adjustable indent. 100% local.
This tool runs 100% in your browser. All computation happens locally on your device — your input is never uploaded to any server. Results are for reference only.
Both formats encode the same data structure — objects, keys, values, arrays. JSON wraps every object in { } and separates members with commas, so braces carry the structure. YAML drops the braces and lets indentation carry the structure: a child key that is indented one more level belongs to the parent above it. Arrays are introduced with - . Converting is lossless for well-formed data — every level of nesting in one maps to exactly one level of indent in the other.
The same server config is written once in each syntax. Notice how each { } block on the left becomes one indented block on the right — the nesting level is the signal in YAML.
Moving a Node deployment config from JSON to YAML for readability.
Convert JSON to YAML and back. Bidirectional, 2/4 space indent, copy and download. Perfect for Kubernetes configs. Free, no signup.
This converter switches configuration and data between JSON and YAML in both directions. YAML in, structured JSON out; JSON in, clean YAML with your choice of 2 or 4 space indentation. The parser handles YAML's depth — nested maps, sequences, multi-line strings, anchors and aliases — and produces predictable JSON keys, while the reverse direction emits YAML that Kubernetes, Docker Compose, and CI systems consume without complaint. Output can be copied or downloaded, and because infra configs often contain secrets and internal hostnames, everything converts locally in the page.
DevOps engineers translate JSON-formatted cloud API payloads into YAML manifests for Kubernetes and CI pipelines, and back. Developers maintaining Docker Compose files convert to JSON for programmatic manipulation, then return to YAML for readability. Anyone inheriting a YAML file with anchors and multi-line blocks flattens it into JSON to see the real structure. Technical writers producing documentation examples keep both formats in sync. The local-only guarantee fits configs holding credentials, tokens, and internal endpoints.
(1) Paste JSON or YAML — the tool detects the direction automatically. (2) Conversion parses the full document, resolving nesting, arrays, and YAML block scalars. (3) Choose indentation for YAML output; keys keep their order so diffs stay reviewable. (4) Copy or download the result. Round-tripping is safe for data: numbers, booleans, null, nested structures, and unicode strings all preserve values exactly, with errors reported at the first invalid construct instead of failing silently.
JSON wins on universality and safety: every language parses it, comments are forbidden so nothing can hide, and its strict grammar means one valid way to express any structure. YAML wins on human authorship: indentation-based nesting, comments for explaining non-obvious settings, and multi-line block strings for scripts and certificates — which is why Kubernetes manifests, Compose files, GitHub Actions, and Ansible all chose it. YAML's cost is the famous gotcha list: the Norway problem where a bare no parses as boolean false, version numbers like 1.10 becoming 1.1 unless quoted, and tabs being illegal for indentation. Practical discipline: author configs in YAML with values quoted when ambiguous, exchange data in JSON, and use this converter when crossing the boundary — especially flattening YAML you inherited into JSON you can reason about.
Yes, completely free with no signup, no API keys, and no usage limits. All conversion happens in your browser using JavaScript.
Yes, the tool is bidirectional. Use the YAML → JSON button to convert YAML back to JSON with proper typing (strings, numbers, booleans, nulls).
No. All processing is 100% local. Your JSON, YAML, and configuration data never leave your browser. There are no network requests — everything runs in JavaScript on your device.
Yes, the tool handles deeply nested objects, arrays, multiline strings, and all standard YAML/JSON features including anchors, aliases, and multiline block scalars.
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