How to Convert Config Files Between YAML, JSON, TOML, and INI Online
Working with multiple configuration file formats is common in software development. Different tools and frameworks prefer different formats — Docker uses YAML, npm uses JSON, Rust uses TOML, and legacy systems use INI. This guide shows you how to convert between config formats online using fixie.tools — a free tool that handles all major configuration file formats instantly.
Step 1: Open the Config File Converter
Go to fixie.tools/config-convert in your browser. No signup or installation needed.
Step 2: Paste or Upload Your Config
Paste your configuration file content into the input area, or upload a config file directly. The tool auto-detects the input format (YAML, JSON, TOML, or INI) based on the content structure.
Step 3: Select the Target Format
Choose the output format you need: YAML, JSON, TOML, or INI. The converter handles nested structures, arrays, and data types correctly across formats.
Step 4: Review and Copy the Output
The converted config appears instantly in the output panel. Review it for correctness — the tool preserves data types and structure. Copy the output or download it as a file.