TOML to JSON Converter

Convert TOML configuration files to JSON — supports tables, arrays of tables, and all TOML data types

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TOML to JSON Converter


                    

                

            

            
        


        

            
Why Convert Between TOML and JSON?
            

            
TOML is designed for human-readable configuration files (Rust's Cargo.toml, Python's pyproject.toml, Hugo's config.toml) while JSON is the standard for web APIs and JavaScript tooling. When you need to pass TOML configuration to a JSON API, integrate with JavaScript tools, or share data between different ecosystems, this converter bridges the gap instantly.
            

            

                                    

                        
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                            Complete Type Conversion

                        
TOML strings, integers, floats, booleans, and datetime all convert correctly to their JSON equivalents

                    

                                    

                        
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                            Tables & Array of Tables

                        
Correctly handles [table], [[array of tables]], and inline table {key = val} syntax

                    

                                    

                        
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                            Formatted JSON Output

                        
Output is pretty-printed with indentation for readability — not compressed single-line JSON

                    

                            

        

        

            

                How to Convert TOML to JSON

            

                                    

                        

                            1

                        

                            Paste TOML Config

                        

                            Paste your Cargo.toml, pyproject.toml, or any TOML config file content

                    

                                    

                        

                            2

                        

                            Automatic Conversion

                        

                            The tool instantly parses and converts the TOML structure to equivalent JSON

                    

                                    

                        

                            3

                        

                            Copy JSON

                        

                            Copy the generated JSON to use in API calls or other tools that accept JSON input

                    

                            

        

        

            
TOML to JSON Use Cases
            

            

                                                        

                        
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Cargo.toml Analysis

                            
Convert Cargo.toml to JSON for CI scripts that analyze dependencies or extract version info

                        

                    

                                                        

                        
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Hugo Site Config

                            
Convert Hugo's TOML config.toml to JSON for integration with other tools or data sources

                        

                    

                                                        

                        
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API Data Passing

                            
Convert TOML-format settings to JSON for passing to REST APIs or GraphQL endpoints

                        

                    

                                                        

                        
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Format Learning

                            
Understand TOML→JSON structure mapping to learn how the two formats relate to each other

                        

                    

                            

        

        

            
TOML Best Practices
            

            

                                                        

                        
✓ Use Dot Notation for Nested Tables

                        
TOML supports [server.database] as a shorthand for nested tables, making configs more readable than JSON's nested braces.

                    

                                                        

                        
✓ Use Literal Strings for Paths

                        
Single-quoted literal strings like 'C:\Users\path' don't process escape sequences — ideal for Windows file paths and regex patterns.

                    

                                                        

                        
✓ Use Comments Liberally

                        
TOML's biggest advantage over JSON is comment support. Document every config option with # comments for maintainability.

                    

                                                        

                        
✓ Be Aware of DateTime Type Conversion

                        
TOML's native RFC 3339 datetime (2024-01-15T10:30:00Z) becomes a string in JSON. Code consuming the JSON will need to parse it back to a date object.

                    

                            

        

        

            

                ❓ Frequently Asked Questions

            

                                                            

                            
What advantages does TOML have over YAML and JSON?

                            
TOML is simpler than YAML (no indentation-based structure), more readable than JSON (supports comments), and has explicit types (integers, floats, datetimes are distinct). It's the best choice for application configuration files where human readability matters.

                        

                                                                                                                    

                            
What is [[array of tables]] in TOML?

                            
[[servers]] defines an array of objects named 'servers'. Each time [[servers]] appears, it creates a new object in the array. The keys below it belong to that object. Equivalent to JSON's {"servers": [{...}, {...}]}.

                        

                                                                                                                    

                            
Which major tools use TOML?

                            
Rust (Cargo.toml), Python's modern packaging (pyproject.toml with pip/poetry), Hugo static site generator, Gitea, Lighthouse CI, and many Go tools use TOML. Its adoption is growing in the DevOps ecosystem.

                        

                                                                                                                    

                            
Are TOML comments preserved in the JSON output?

                            
No. JSON has no comment syntax, so TOML # comments cannot be represented in the JSON output. If comments document important configuration decisions, consider preserving them in a separate README or using _comment keys in JSON.