⚡ JSON & API Developer Workbench • Local-First, Zero Server Logging

Turn API Payloads Into Production Code

Format, inspect, compare, generate and mock JSON — without sending your data to a server.

Open Workbench App → ⚡ Java & Spring Boot Tools →

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⚡ POPULAR FEATURE

JSON → Java & TypeScript Class Generator

Paste any raw REST API payload. Automatically generate Jackson-annotated Lombok classes, Java 17/21 Records, or strict TypeScript interfaces with 0 manual typing.

⚡ Launch JSON to Java & TS Tool →

@Data @Builder @NoArgsConstructor public class OrderDTO { @JsonProperty("order_id") private Long orderId; @JsonProperty("customer") private CustomerDTO customer; @JsonProperty("items") private List<ItemDTO> items; }

🔄 REVERSE GENERATOR

Class Definition → Valid JSON Payload

Paste your Spring Boot DTO, Java class, or C# struct definitions. Automatically infer data types and construct example JSON payloads for Postman testing.

🔄 Launch Class to JSON Tool →

// Auto-Generated Example JSON Payload { "userId": 4012, "username": "sarah_chen", "email": "sarah@techscale.io", "active": true, "roles": ["ROLE_ADMIN", "ROLE_DEV"] }

🔍 QA & DEVOPS

Visual Side-by-Side JSON Diff & Drift Check

Compare staging vs production API responses side-by-side. Spot missing keys, data type mutations, and unexpected schema regressions with color-coded diff highlighting.

🔍 Launch Visual JSON Diff Tool →

// Visual Side-by-Side JSON Diff Result: { "id": 9821, "status": "active", + "api_version": 2.1, // Added in Staging - "deprecated": false // Removed in Staging }

🛠️ SYNTAX RECOVERY

Auto-Repair Malformed JSON & Formatter

Fix malformed cURL dumps, single-quoted JS objects, unquoted keys, and trailing commas automatically with 1-click precision.

🛠️ Launch Formatter & Auto-Repair →

// Input: { user: 'john', active: true, } // Repaired Valid RFC 8259 JSON Output: { "user": "john", "active": true }

🎲 MOCK SERVER

Synthetic Mock Data & OpenAPI Generator

Produce hundreds of realistic synthetic records (UUIDs, names, emails, timestamps) or export complete OpenAPI 3.0 YAML specifications.

🎲 Launch Synthetic Mock Tool →

// Generated Synthetic API Response (3 Records) [ { "id": "f81d4fae-7dec", "name": "Sarah Chen" }, { "id": "a1b2c3d4-e5f6", "name": "Alex Rivera" } ]

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No Sign-up Required Instant access, 0 onboarding friction

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PWA / Offline Ready Installs locally as desktop app

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Zero Network Roundtrips Payloads never touch any server

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Blazing Fast Local Engine Sub-millisecond local generation

INSTANT CODE GENERATORS

Convert JSON to 12+ Target Languages

Click any target language below to open its dedicated generator with production-grade type inference, annotations, and instant file downloads.

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JSON to Java

Lombok / POJO

Generates Jackson-annotated Java DTOs, `@Data` Lombok classes, and Spring Boot Maven project ZIPs.

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JSON to TypeScript

Interfaces & Types

Generates exported TypeScript interfaces, types, nested object definitions, and nullable field mappings.

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JSON to Python

Dataclass / Pydantic

Generates Python `@dataclass` type hints, Pydantic v1/v2 models, and `List[T]` / `Optional[T]` structures.

🐹

JSON to Go

Golang Structs

Generates idiomatic Golang structs with `json:"field_name"` tags, PascalCase naming, and slices.

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JSON to C#

.NET 8 / System.Text.Json

Generates C# classes with `[JsonPropertyName]` attributes, `List<T>` properties, and .NET Core support.

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JSON to Rust

Serde Structs

Generates Rust structs with `#[derive(Serialize, Deserialize)]` and `Option<T>` for nullable keys.

🎯

JSON to Kotlin

Data Class / Android

Generates Kotlin data classes for Android Studio, Moshi, Gson, and `kotlinx.serialization`.

🍏

JSON to Swift

Codable Structs

Generates Swift `Codable` structs for iOS, iPadOS, macOS, and SwiftUI application networking.

🛡️

JSON to Zod

Runtime Schema

Generates TypeScript Zod validation schemas (`z.object({...})`) for tRPC, React Hook Form, and Node API validation.

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JSON to OpenAPI

Swagger 3.0

Generates OpenAPI 3.0 specification documents and component schemas in YAML or JSON format.

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JSON to GraphQL

Schema & Query

Generates GraphQL `type` definitions, input types, and sample query documents from JSON responses.

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JSON to Protobuf

gRPC proto3

Generates `syntax = "proto3";` message structures and gRPC service definitions from JSON models.

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No Sign-up Required Instant access, 0 onboarding friction

📲

PWA / Offline Ready Installs locally as desktop app

🛡

Zero Network Roundtrips Payloads never touch any server

🚀

Blazing Fast Local Engine Sub-millisecond local generation

WORKFLOW

From Raw Payload to Production Code in 4 Steps

Eliminate manual boilerplate typing and syntax debugging forever.

STEP 01

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Paste or Import

Drop raw JSON, server log dumps, or cURL output directly into the workbench canvas.

Ctrl + V or Drop .json File

STEP 02

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Validate & Format

Auto-repair malformed syntax, format deeply nested arrays, and filter fields via JSONPath.

{ "status": 200, "data": [...] }

STEP 03

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Generate Types

Pick your target language: TypeScript, Java Lombok, Python Pydantic, Zod, or SQL DDL.

interface OrderResponse { id: number }

STEP 04

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Copy & Ship

One-click copy production-grade types or download structured Spring Boot Maven project ZIPs.

export interface UserDTO { ... }

BY WORKFLOW

Tailored for Every Developer on Your Team

Purpose-built code generators and analysis tools for backend, frontend, QA, and data engineering.

BACKEND & SPRING BOOT

JSON to Java `@Data` Lombok & Jackson

Instantly generate Jackson-annotated DTOs with `@JsonProperty`, `@NotNull`, Lombok `@Data`, `@Builder`, and Java 17/21 `record` support. Package into a ready-to-run Spring Boot Maven ZIP with 1 click.

@Data @Builder @NoArgsConstructor @AllArgsConstructor public class OrderDTO { @JsonProperty("order_id") private Long orderId; @JsonProperty("customer") private CustomerDTO customer; }

FRONTEND & TS

Strict TypeScript Interfaces & Zod Schemas

Convert nested payloads into clean exported TypeScript interfaces with optional fields, nullable union types, and runtime Zod validation schemas for React, Next.js, and Node apps.

export interface OrderPayload { orderId: number; customer: Customer; items: Item[]; } export const OrderSchema = z.object({ ... });

QA & DEVOPS

Visual Side-by-Side JSON Diff & Schema Drift

Compare staging vs production API responses side-by-side. Spot missing keys, mutated data types, and unexpected schema regressions with color-coded diff highlighting.

+ "status": "active", - "is_active": true, ! "price": 49.99 (changed from 50.00)

DATA & SQL ANALYSTS

Dot-Notation Flattening & SQL DDL Export

Unnest deeply nested JSON objects into flat dot-notation CSV tables or generate PostgreSQL, MySQL, and SQLite `CREATE TABLE` DDL statements with auto-inferred data types.

CREATE TABLE orders ( order_id BIGINT PRIMARY KEY, customer_email VARCHAR(255), created_at TIMESTAMP );

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Air-Gapped Privacy & Zero Data Transmission

Your API tokens, customer PII, and production payloads never touch our servers. Every single line of code is formatted, validated, and converted entirely inside your local browser engine.

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0 Network Requests

All processing stays in your local browser tab

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Air-Gapped Ready

Works fully offline without an internet connection

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No Payload Telemetry

Zero clipboard or input data logging

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Client Sandbox

Safe for confidential enterprise production JSON