Config Convert
Modern software projects use a variety of config formats — Spring Boot uses YAML, Node.js uses JSON, Python uses TOML, Java uses Properties, Docker uses .env, and legacy systems use INI or XML. Switching between projects means constant format conversion. This tool converts between 7 config formats — paste once, convert instantly.
Bidirectional conversion between YAML, JSON, TOML, INI, Properties, .env, and XML. Auto-detects source format, converts in real time, and warns on format mismatches. All conversion is client-side — your config file content never leaves your browser.
From:
→To:
YAML
TOML
Enter content to convert
📖 Config Format Converter Guide
Seven Config Formats at a Glance
Each ecosystem has its own config format — none fits all use cases. Understanding the strengths and ideal scenarios for each helps you choose the right one:
Format Details
- YAML (.yml/.yaml): Most human-readable. Supports comments, anchors, and references. Standard for Kubernetes, Docker Compose, GitHub Actions, Ansible. Indentation-sensitive — beginners often hit parse errors from wrong indentation.
- JSON (.json): Universal data interchange. No comments (except JSONC), no trailing commas. Common for frontend configs (package.json, tsconfig.json) and API responses.
- TOML (.toml): Tom's Obvious Minimal Language. Clearer semantics than YAML. Widely used by Python (pyproject.toml) and Rust (Cargo.toml). Supports comments and nested tables.
- INI (.ini): Simplest format. Common in Windows and PHP legacy projects. [section] + key=value. No nesting.
- Properties (.properties): Java ecosystem standard (application.properties). Similar to INI but without sections. key=value, also supports key:value.
- .env: Docker and Node.js environment variable format. KEY=VALUE, no nesting, no quotes. Great for injecting env vars; poor for complex config.
- XML (.xml): Most verbose but most feature-rich. Supports attributes, namespaces, Schema validation. Still used by enterprise apps (Spring XML config, Maven POM) and SOAP.
Conversion Caveats
- Comments are lost: YAML/TOML/INI comments disappear when converting to JSON or .env since those formats don't support comments. Keep the original file.
- Type degradation: YAML natively supports dates and booleans. Converting to JSON may flatten types to strings. Verify manually.
- Nesting flattening: Properties and .env are flat formats. Converting nested YAML/JSON to them uses SECTION_KEY flattening. Reverse conversion attempts to restore nesting, but structure may not be perfect.
- Privacy: All conversion happens client-side. Config content is never uploaded. Verify in DevTools → Network: zero requests during conversion.