JSON to YAML Converter - Free Online Tool

Convert JSON to clean, readable YAML format instantly. Supports nested objects, arrays, and all JSON types.

JSON Input

YAML Output

Browser-only processing.

JSON to YAML Converter is a free online tool that works entirely in your browser — no signup, no data uploaded, no limits.

JSON to YAML Converter - Human-Readable Configuration in One Click

Paste JSON and get properly indented YAML back immediately. The converter maps all JSON types to their YAML equivalents: objects become mappings, arrays become sequences with - list items, booleans stay unquoted, multi-line strings use literal block style (|), and ambiguous strings like "true" and "null" get quoted to prevent YAML parser misinterpretation.

YAML is the configuration language of modern DevOps. Kubernetes manifests, Docker Compose files, GitHub Actions workflows, Helm chart values, Ansible playbooks, AWS CloudFormation templates, and CircleCI pipelines are all YAML. A JSON config file converted to YAML typically shrinks by 30-40% in line count and becomes significantly easier to read and review in pull requests.

YAML Specification Compliance

The output follows YAML 1.2, which is supported by Kubernetes (k8s uses Go's yaml.v3), Python's PyYAML, Ruby's Psych, and JavaScript's js-yaml. YAML 1.1 (older PyYAML default) had some differences in boolean handling (on/off were booleans) - this converter targets 1.2 to avoid those legacy quirks.

YAML Traps This Converter Handles

Strings that look like booleans (yes, no, true, false, on, off) are quoted. Strings that look like numbers ("1.0", "0x1F") are quoted. Strings with colons followed by spaces ("key: value") are quoted. Tab characters are never used - only spaces. All of these would cause silent type mismatches in unquoted YAML.

Relevant Keywords

json to yaml, convert json to yaml, yaml converter online, kubernetes yaml generator, docker compose yaml, json yaml transform, openapi yaml, helm values yaml, ansible yaml

How Does JSON to YAML Converter Work?

Paste or upload your content above, click the button, and results appear instantly — all processed in your browser with nothing sent to any server.

Frequently Asked Questions

2 spaces per level - the standard for Kubernetes, Helm, GitHub Actions, and most YAML-heavy ecosystems. Toggle to 4-space indentation for Python projects or if your team prefers wider indentation.

Arrays become YAML sequences: [{'name':'Alice'}] becomes a sequence item: - name: Alice. Nested array objects get their own indented block under the - marker.

Strings like true, false, yes, no, on, off are quoted in the YAML output to prevent parsers from converting them to boolean values. This is a YAML 1.1 vs 1.2 edge case that catches many developers off guard.

Yes. The converter produces YAML 1.2 output compatible with Kubernetes' Go-based YAML parser. Kubernetes uses sigs.k8s.io/yaml which is strict about types - the quoted string handling in this converter prevents common type coercion issues.

Yes - use the YAML to JSON tool on Tooliby. Both tools are designed as a complementary pair for format round-tripping.