Outils > JSONJSON to Code

Indent size

Entrée

Sortie

Valid JSON: Non

Format:

Lines: 0

JSON to Code Converter

Convert JSON data into ready-to-use code for 7 popular languages and data formats. Whether you need a JavaScript object literal, a TypeScript interface with inferred types, a Python dictionary, YAML config, TOML settings, XML document, or CSV table — paste your JSON and get clean, properly formatted output instantly. All processing happens in your browser.

Comment Utiliser Cet Outil

Paste your JSON — Paste a valid JSON object, array, or primitive into the input panel. The tool accepts any valid JSON.
Choose output format — Select from JavaScript, TypeScript, Python, YAML, TOML, XML, or CSV. Each format has its own specialized output.
Configure format-specific options — Adjust quote style, indentation, trailing commas, TypeScript mode (interface/type/as const), variable declarations, YAML null style, XML root element, or CSV delimiter.
Copy the result — The converted code appears in the output panel in real-time. Copy it directly into your source files, config, or spreadsheet.

Fonctionnalités

Seven Output Formats

JavaScript object literals, TypeScript with type inference, Python dictionaries, YAML, TOML with section headers, XML with proper escaping, and CSV from flat arrays.

TypeScript Type Generation

Automatically infer TypeScript interfaces or type aliases from your JSON structure. Handles nested objects, arrays, union types, and null. Supports "as const" for literal types.

Smart Key Handling

JavaScript keys that are valid identifiers are left unquoted. Reserved words and keys with special characters are automatically quoted. Python keys always use your chosen quote style.

Configurable Formatting

Choose between single and double quotes, spaces and tabs, 1-8 space indent sizes, and optional trailing commas for JS/TS output.

Variable Declarations

Optionally wrap output in const or let declarations with a custom variable name. Python uses simple assignment syntax.

Format-Specific Options

YAML null style (tilde, null, or empty), XML root element name, CSV delimiter (comma, semicolon, tab), and TOML warnings for unsupported structures.

Cas d'Utilisation Réels

Embedding API responses in source code

When you need to hardcode sample data, mock responses, or fixtures from a JSON API into JavaScript, TypeScript, or Python files.

Generating TypeScript types from JSON

Quickly create TypeScript interfaces or type aliases from JSON payloads returned by APIs, saving manual type definition work.

Converting config formats

Migrate configuration from JSON to YAML (Kubernetes, Docker Compose), TOML (Rust Cargo, Python pyproject), or XML (legacy systems, Maven).

Exporting data to CSV

Convert a JSON array of objects from an API or database export into CSV format for spreadsheets, data analysis, or import into other tools.

Creating test fixtures

Convert JSON test data into language-native literals for unit tests in JavaScript, TypeScript, or Python projects.

Questions Fréquemment Posées

Does this tool validate my JSON before converting?

Yes. The tool parses your input as JSON first. If the JSON is invalid, it shows an error message instead of output. You can use our JSON Formatter tool to fix common JSON issues.

What TypeScript types are inferred from JSON?

The tool infers string, number, boolean, null, nested object types, and arrays. Arrays with mixed types become union types (e.g., (string | number)[]). Empty arrays become unknown[] and empty objects become Record<string, unknown>.

Can I convert JSON to TOML if it has null values?

TOML does not support null values. The tool will generate the output but display a warning for any null values encountered, as they cannot be represented in TOML.

Why does CSV only work with arrays of objects?

CSV is a tabular format with headers and rows. It requires an array of flat objects where object keys become column headers. Nested objects within the array are serialized as JSON strings with a warning.

Are JavaScript reserved words handled correctly?

Yes. Object keys that are JavaScript reserved words (class, for, return, etc.) are automatically quoted in the output. Regular valid identifiers are left unquoted for cleaner code.

Is my data processed securely?

Absolutely. All conversion happens entirely in your browser using JavaScript. No data is sent to any server. You can verify this by checking your browser's network tab.