Free TOML to JSON — Cargo.toml · pyproject.toml · config.toml

Convert TOML to JSON
Cargo, pyproject
and any TOML file.

Convert any TOML file to JSON instantly. Full TOML support: tables, array of tables, inline tables, all value types. Runs entirely in your browser.

Your data never leaves your browser
Cargo.toml supported
pyproject.toml supported
[[array of tables]]
Always free
Need the reverse? JSON to TOML converter
TOML to JSON Converter   100% client-side
TOML input
  JSON ready 

      

 
    

  

 
  
  
TOML features supported

  
All standard TOML types and structures are handled.

  

    
TOML syntaxJSON outputExample

    
      
[section]Nested object{"section": {...}}

      
[[array]]Array of objects{"array": [{...}, {...}]}

      
[a.b.c]Deeply nested{"a": {"b": {"c": {}}}}

      
key = "value"String"key": "value"

      
count = 42Integer"count": 42

      
pi = 3.14Float"pi": 3.14

      
active = trueBoolean"active": true

      
tags = ["a", "b"]Array"tags": ["a", "b"]

      
info = {k = "v"}Inline table"info": {"k": "v"}

      
date = 2024-01-15Date string"date": "2024-01-15"

    
  

 
  

 
  
  
Common use cases

  

    

      
 Cargo.toml → JSON

      
Inspect Rust project metadata, dependencies and build profiles as JSON. Useful for tooling, scripts and CI pipelines that need to read Cargo manifest data without a Rust toolchain. The [[bin]] and [[example]] array-of-tables sections are converted to JSON arrays.

    

    

      
 pyproject.toml → JSON

      
Read Python project configuration and Poetry/Hatch dependencies as JSON. The nested dotted-key syntax ([tool.poetry.dependencies]) is correctly resolved to nested JSON objects — {"tool": {"poetry": {"dependencies": {...}}}}.

    

    

      
 Server config files

      
Many tools use TOML for configuration — Gitea, Prometheus Alertmanager, Hugo, Zola. Convert any config.toml to JSON to inspect it in a JSON viewer, validate it against a schema, or feed it into a JSON-based configuration management system.

    

    

      
 API and data pipelines

      
Data pipelines that ingest TOML configuration files but output JSON — convert TOML manifests to JSON for REST API consumption, database storage or front-end rendering without installing a TOML parser in every service.

    

  

 
  

 
  
  
JSON to TOML
Convert JSON objects into valid TOML tables.
XML to JSON
Parse XML into JSON — attributes, namespaces and CDATA handled.
JSON to YAML
Convert JSON to YAML for config files and Kubernetes manifests.
YAML to JSON
Parse YAML — anchors, merge keys and multi-docs — into JSON.
JSON to .env
Flatten JSON into KEY=VALUE dotenv variables.
.env to JSON
Parse .env files — quotes, export and multi-line values — to JSON.
JSON to XML
Convert JSON into well-formed XML with a custom root element.
JSON to INI
Turn JSON objects into INI [sections] and key=value pairs.
INI to JSON
Parse INI and php.ini files to JSON with type inference.
All data & config formats tools 

 
  
  
 
  

 
  
  

    

      
TOML parsed entirely
in your browser. No server needed.

      
The TOML parser is implemented in vanilla JavaScript — no external library, no CDN dependency. It handles all standard TOML features: basic and literal strings, integers (including hex, octal and binary), floats (including inf and nan), booleans, dates, arrays, inline tables, standard tables, dotted-key tables and array-of-tables.

      
Comments (# inline) are stripped correctly even when they follow a value on the same line.

    

    

      
No external library
The TOML parser is ~200 lines of vanilla JS — no CDN, no npm, no runtime dependency.

      
[[Array of tables]]
The most complex TOML feature — [[sections]] that define arrays of objects — is correctly handled.

      
Dotted key tables
[tool.poetry.dependencies] style keys are correctly resolved to deeply nested JSON objects.

      
52 tools, always free
No watermarks, no account. Funded by non-intrusive display advertising only.

    

  

 
  
  

    
Frequently asked questions

 
    

      
How do I convert Cargo.toml to JSON?

      
Paste your Cargo.toml directly into the converter and click Convert. The [[bin]], [[example]] and [[test]] array-of-tables sections become JSON arrays, and nested tables like [profile.release] become nested objects.

    

    

      
How do I convert TOML to JSON in Python?

      
Python 3.11+ has tomllib built-in: import tomllib, json; data = tomllib.loads(toml_string); print(json.dumps(data, indent=2)). For older Python: pip install tomli then import tomli as tomllib.

    

    

      
How do I convert TOML to JSON in JavaScript?

      
Use the @ltd/j-toml or @iarna/toml packages: npm install @ltd/j-toml; const TOML = require('@ltd/j-toml'); const data = TOML.parse(tomlString); console.log(JSON.stringify(data, null, 2)). Or use this online tool for quick conversions without installing anything.

    

    

      
Is the TOML to JSON converter free?

      
Yes, completely free. No account required.

    

  

 


				
	
		
	


			
		
				
	

	
		
		



 

	
	

	
	
	
	
			
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