Data & JSON tools

JSON to Python Pydantic model converter

Infer Python Pydantic BaseModel fields from sample JSON and generate models with Optional, List, Any and alias mapping support, ideal for quickly modeling API request/response payloads.

Target Root type name Alias mapping

JSON input

Notes: mixed types or arrays degrade to Any; missing or null fields become Optional. All processing runs locally in your browser.

Python output

Usage & Tips

1. Input JSON: Paste or type JSON data into the left panel (supports nested structures). 2. Configure: Set the Root Class Name and toggle Alias Mapping if needed. 3. Generate: The tool automatically infers types and generates Python Pydantic models. 4. Copy: Click "Copy Python code" to save the result to your clipboard.

Generation Tips

Local Processing: All parsing and generation happens locally in your browser. Your JSON data is never uploaded.

Pydantic Support: Generates Pydantic v1/v2 compatible code, handling Optional, List, and nested models automatically.

Shortcuts: Use "Format JSON" to beautify input. The tool highlights syntax errors in invalid JSON immediately.

Go Map ↔ JSON

Convert Go map fmt output to readable JSON and back again directly in your browser so you can paste data into Go code or documentation without sending anything over the network.

TOML Convert

Convert between TOML and JSON with optional pretty JSON output, fully in-browser with no data uploads.

XML to JSON

Free online XML to JSON Converter. Smartly parses XML documents to JSON with custom indentation and attribute handling.

JSON formatter

Format or minify JSON locally with custom indentation and optional key sorting.

JSON compare

Recursively compare two JSON values and list added/removed/changed/type-changed differences.

CSV to JSON

Convert CSV to JSON locally in your browser with configurable delimiter and header handling. Ideal for API testing and data import tasks.

Excel to JSON

Parse Excel workbooks locally and export sheets as JSON with optional header row detection. No files are uploaded.

JSON to CSV

Convert JSON arrays of objects to CSV locally, flattening nested fields into columns. Perfect for spreadsheets and BI tools.

JSON to Excel

Export JSON arrays of objects to .xlsx files locally in your browser with custom sheet and file names.

$JSON \u2194 YAML converter$

JSON \u2194 YAML converter

Convert between JSON and YAML locally in your browser with configurable JSON indentation and one-click copy for config editing.

JSON to C# class

Infer C# property types from sample JSON and generate class definitions with support for List<T>/arrays, JsonPropertyName attributes and nullable reference types, all processed locally in your browser.

JSON to Go Struct

Infer Go struct types from sample JSON and generate struct definitions with json tags and omitempty support for partially present fields, all processed locally in your browser.

JSON to TypeScript

Infer TypeScript types from sample JSON and generate interface/type declarations with support for nested objects, arrays and union types, all processed locally in your browser.

JSON to Java POJO

Infer Java POJO field types from sample JSON and generate class definitions with List<T>/array support, optional @JsonProperty annotations and nested static classes, all processed locally in your browser.

JSON to Kotlin data class

Infer Kotlin data class fields from sample JSON and generate type-safe models with List, nullable types and optional kotlinx.serialization annotations, all processed locally in your browser.

JSON to Rust Serde struct

Infer Rust struct types from sample JSON and generate serde-ready definitions with Option, Vec and field rename support, all processed locally in your browser.

JSON diff viewer

Visually diff two JSON values with a recursive tree, showing added, removed, changed and type-changed nodes, with hide-equal and copyable diff list, all processed locally in your browser.

JSON Schema Validator

Validate JSON data against a JSON Schema locally in your browser, with clear error paths and messages for type, required, enum, const, min/max, pattern and more. $ref is not resolved.

JSON to JSON Schema

Generate JSON Schema from sample JSON locally in your browser, including type/properties/required/items and optional additionalProperties=false for API definitions and documentation.

INI / YAML / JSON converter

Convert between INI, YAML, and JSON locally in your browser with basic validation and optional pretty-printed JSON output, ideal for config migrations and debugging.