YAML to JSON & JSON to YAML Converter Online Free
Kubernetes manifests, GitHub Actions workflows and CI configs love YAML; APIs and JavaScript prefer JSON. This two-way converter parses YAML (mappings, sequences, scalars, comments, nested structures) and emits pretty-printed JSON — or parses JSON and emits clean YAML — with indent options, key sorting and clear error messages when the source is malformed. Everything is local to your browser, so proprietary config files never leave your machine.
YAML to JSON & JSON to YAML Converter In-Browser Workspace
Input data or select files to begin. 100% private, client-side execution with zero server transmission.
How to Use YAML to JSON & JSON to YAML Converter
- Step 1: Paste YAML on the left or JSON on the right, then choose the conversion direction.
- Step 2: Set JSON indent width (2 or 4 spaces) and optionally sort object keys alphabetically.
- Step 3: Toggle comments-stripped output if you want YAML without # commentary lines.
- Step 4: Watch for inline validation errors — line and column hints appear under the output.
- Step 5: Copy the converted document with one click into your repo or pipeline.
About YAML to JSON & JSON to YAML Converter
YAML is a whitespace-significant data format: indentation defines nesting, “key: value” pairs build mappings, “- ” items build sequences, and scalars are typed into null, booleans, integers, floats or strings by pattern. Comments start with # and are discarded on conversion. The parser here handles the common subset used by real-world config — block mappings and sequences (including nested and inline flow forms like [a, b] and {k: v}), quoted strings (single and double, with escapes), multi-line block scalars (| and >), anchors are NOT expanded (reported as unsupported), and scalar coercion matching JSON types. Converting to JSON means rebuilding JavaScript objects and arrays then serializing with chosen indentation; converting JSON→YAML walks the structure emitting “key: value” lines with computed indent, quoting strings only when necessary so booleans and numbers remain typed. Round-tripping YAML → JSON → YAML preserves data values but normalizes formatting (comments and key order may change unless sorting is disabled). Error reporting points at the first offending line — mismatched indentation, a tab character, or an unexpected colon — which is the usual pain point when hand-editing workflows. Because parsing is recursive descent over lines with a small tokenizer, typical config files convert in milliseconds with no network calls.
Frequently Asked Questions
Are comments preserved?
No — YAML comments are stripped because JSON has no comment syntax; keep the original file if you need them.
Does it support YAML anchors and aliases (& and *)?
Anchors/aliases are not expanded in this lightweight parser; unsupported constructs raise a clear error.
Will key order stay the same?
Order is preserved by default; enable “sort keys” if you want deterministic alphabetical output instead.
Is my config uploaded anywhere?
No — parsing and serialization run entirely client-side in your browser tab.
Can I use tabs for YAML indentation?
YAML forbids tabs for indentation; the validator flags tab characters so you can fix them before deploying.