Is my JSON uploaded to a server?

No. Tool processing runs locally in your browser. We do not accept JSON payloads on a backend API.

Format and validate, compare two documents, query with JSONPath, derive Schema, convert YAML/CSV/XML, generate code, repair messy JSON, mask secrets, flatten, batch-process files, and build Mock data.

Where is the blog and feedback?

Blog and feedback open on the toolsworkbox hub so every tool site shares one content and contact surface.

JSON Workbox

Offline-first JSON toolkit for developers.

Format, validate, diff, convert, mask, and generate code from JSON locally in your browser.

Open JSON Tools Read the blog

Why JSON Workbox

Local offline processing

JSON stays in your browser. Formatting, diff, convert, and codegen never upload your payload.

One toolkit, many jobs

Format, validate, Diff, JSONPath, Schema, convert, repair, mask, flatten, batch, and Mock in one place.

Guides on the hub

Product notes and how-tos live on the toolsworkbox blog for the JSON Workbox sub-site.

Fast, private, free

No account required. Drafts can stay in localStorage on your device until you clear them.

Utilities

JSON Format & Validate

Ready

Beautify, minify, validate, and explore JSON in a local tree view.

JSON Diff

Ready

Compare two JSON documents with path-aware change highlights.

JSONPath Extractor

Ready

Query JSON with JSONPath expressions and preview matches.

JSON Schema

Ready

Infer JSON Schema from samples and validate payloads.

JSON Repair

Ready

Best-effort fix for trailing commas, quotes, and comments.

JSON Mask

Ready

Mask phones, IDs, emails, and custom JSONPath fields.

JSON Structure Stats

Ready

Node counts, depth, type distribution, and duplicate-key warnings.

JSON Batch

Ready

Validate, format, or convert many JSON files and download a ZIP.

Converter

JSON Convert

Ready

Convert between JSON, YAML, CSV, and XML offline.

JSON Flatten

Ready

Flatten nested JSON to dot paths or restore nested objects.

Generators

JSON Codegen

Ready

Generate TypeScript, Go, PHP, Java, Dart, or SQL from JSON.

JSON Mock Generator

Ready

Configure fields and generate sample JSON for tests.

FAQ

Is my JSON uploaded to a server?: No. Tool processing runs locally in your browser. We do not accept JSON payloads on a backend API.
What can I do here?: Format and validate, compare two documents, query with JSONPath, derive Schema, convert YAML/CSV/XML, generate code, repair messy JSON, mask secrets, flatten, batch-process files, and build Mock data.
Where is the blog and feedback?: Blog and feedback open on the toolsworkbox hub so every tool site shares one content and contact surface.

Tools available: 12