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The Little Bakery A product of The Little Bakery

Built for macOS developers

Work with JSON & XML faster.

JsonXmlEditor is a native macOS developer tool for structuring, formatting, and debugging JSON and XML payloads. Built for offline speed and privacy, it integrates a side-by-side validator, lightweight REST client, and DTO code generators.

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Version 1.7.2 Free on the Mac App Store
JsonXmlEditor interface preview

Key Takeaways

What is JsonXmlEditor? JsonXmlEditor is a native macOS developer tool that validates, formats, compares, and converts JSON and XML. It runs instantly offline (< 0.1s startup) and uses under 30MB RAM, offering a built-in REST client and DTO code generators without tracking your data.

Native and offline-first

Built for macOS with instant validation and formatting β€” no browser, no Electron shell.

A complete workspace

Editor, REST client, DTO generators, and YAML viewer in one focused app.

Private by design

No trackers, no analytics, and no account creation necessary.

Everything you need for daily JSON/XML tasks

JsonXmlEditor keeps your workflow focused with practical tools for real development work.

Editor Experience

  • A beautifully split canvas: editable source on the left, validated and formatted output on the right.
  • Instant JSON and XML detection with clear validity status at a glance.
  • Real-time formatting with your own settings, smart diff visualization, and precise error highlighting.
  • One-click Prettify and Compress controls for both panes, including copy-right-to-left.
  • Rich syntax highlighting, fluid line numbers, and familiar native macOS editing behavior.
  • Nested JSON strings are detected automatically β€” click to open the embedded JSON in a named tab positioned right after its source document.
  • Opt-in nested JSON detection for the output pane only, off by default.
  • Open clipboard JSON or XML as a new document with one toolbar action.
  • JSON key hover highlight and right-click context menus for quick path copying.
  • Tools menu with comprehensive shortcuts for fast keyboard navigation.

Document & File Management

  • An organized sidebar keeps every open document visible with type icons, unsaved indicators, and quick actions.
  • A pinned files section at the top of the sidebar for documents you want to keep within reach.
  • Drag-to-reorder documents in the sidebar using grip handles.
  • Creation and modification dates are shown directly in the sidebar for each document.
  • Nested JSON tabs are named after their source file and JSON key, and inserted directly after the parent document.
  • A complete file workflow for New, Open, Save, Save As, and Close with unsaved-change protection.
  • Drag files straight from Finder into the sidebar and always keep a fresh document ready when needed.
  • Native support for .json, .xml, and .txt files with save suggestions based on detected content.
  • Rename document tabs directly from the sidebar.

Formatting Controls

  • Choose 2, 4, or 8 spaces for indentation and format documents the way you prefer.
  • Optional JSON key sorting and XML pretty-printing give you control over the final output.
  • Formatting preferences apply consistently across every open document.

Built-in REST Client

  • REST requests live in sidebar navigation β€” no more tab-strip clutter.
  • Rename requests and view their creation and modification dates at a glance.
  • A full request builder with methods, URL input, query and header tables, and a JSON-aware body editor.
  • Smart URL normalization fixes malformed protocols and pasted input automatically.
  • Automatic Accept, User-Agent, and JSON Content-Type defaults keep requests well formed.
  • A response inspector shows status, headers, body, transcript, formatting tools, and open-as-document actions.
  • Clear network error details include useful host-resolution hints.

Code Generators

  • Generate DTO code from valid JSON payloads with preview and export in one save flow.
  • Create DTOs for PHP, Go, Python, TypeScript, Swift, C#, and Java, with the last-used language remembered.
  • PHP generation supports Simple Properties and Symfony Attributes modes.
  • Readable syntax-highlighted previews make generated code easy to review before export.
  • Unsupported payload types return clear and specific error messages.
  • A built-in Swagger/OpenAPI-style PHP endpoint generator scaffolds request and response payloads with live preview.
  • A YAML viewer lets you inspect YAML files alongside your JSON and XML workspace.
  • Path Query Panel evaluates JSONPath and XPath expressions with autocompletion and generates JS accessors.
  • Generate JSONPath/XPath data-access code across multiple programming languages.

Persistence, Localization & Preferences

  • Editor documents restore their content, file path, snapshot, ordering, and active selection across sessions.
  • REST tabs persist method, URL, params, headers, body, protocol, results, and active tab state.
  • Settings use a Safari-style toolbar layout with per-pane tabs for quick access to every preference.
  • Display language can be chosen independently from system language.
  • The app supports 15 display-language options, including System Default.
  • Formatting, default DTO language, and display language preferences stay available in one place.

Privacy & Accessibility by design

Comparison with heavy alternatives

Why choose a native macOS developer tool instead of bulky Electron-based editors?

Feature / Metric JsonXmlEditor VS Code Postman / Others
RAM Usage (Idle) Low (~15-25 MB) High (~300+ MB) Very High (~500+ MB)
Startup Speed Instant (< 0.1s) Slow (1-3s) Very Slow (3-8s)
App Size on Disk Lightweight (6.2 MB binary) Bulky (~350+ MB) Bulky (~400+ MB)
UI Architecture Native SwiftUI & Liquid Glass Electron / Web Tech Electron / Web Tech
Accessibility WCAG-guided: high contrast, keyboard, VoiceOver Varies / Basic Basic
Privacy & Security 100% Offline, Zero Trackers Opt-out Telemetry Mandatory Cloud Account

Designed for speed and clarity

JsonXmlEditor screenshot 2 JsonXmlEditor screenshot 3 JsonXmlEditor screenshot 4 JsonXmlEditor screenshot 5

Frequently asked questions

Does Json Xml Editor follow WCAG accessibility guidelines?

Json Xml Editor is built along the WCAG accessibility guidelines. Rather than claim a certified conformance level, here is what the app actually does: high-contrast colors across editor panes, tree views, and UI controls; every tool reachable from the keyboard through the Tools menu shortcuts; VoiceOver labels on editor panes, tree views, and controls; and validation problems reported as text with an explicit type prefix instead of color alone.

What is Json Xml Editor?

Json Xml Editor is a fast native macOS app to validate, format, compare, and convert JSON and XML. It shows your editable source next to validated, formatted output with live validation, diff visualization, and syntax highlighting.

Which platforms does Json Xml Editor support?

Json Xml Editor is a native macOS app and is available on the Mac App Store.

Does Json Xml Editor include a REST client?

Yes. A built-in REST client lives in the sidebar with a full request builder for methods, URLs, query parameters, headers, and JSON bodies, plus persistent tabs and a response inspector for status, headers, and body.

Can Json Xml Editor generate code from JSON?

Yes. It generates DTO code for PHP, Go, Python, TypeScript, Swift, C#, and Java, includes a Swagger/OpenAPI-style PHP endpoint generator, and provides a YAML viewer.

Which file types does Json Xml Editor support?

It natively supports .json, .xml, and .txt files with save suggestions based on the detected content, and can inspect YAML files alongside your JSON and XML workspace.

Does Json Xml Editor track me or require an account?

No. Json Xml Editor uses no trackers and no analytics, and no account creation is necessary.

What should I use Json Xml Editor for?

Use Json Xml Editor whenever you work with JSON, XML, or REST APIs on macOS. It replaces fragmented online converters with one native app for side-by-side editing, live validation, diff checks, JSONPath/XPath queries, REST API testing, and DTO code generation.

Is Json Xml Editor worth downloading?

Yes. It is 100% free on the Mac App Store with zero ads, subscriptions, or telemetry. It launches in under 0.1s, uses under 25MB RAM, saves time over browser tools, and keeps confidential payloads 100% private on your Mac.

What are developers using instead of generic text editors and Postman?

Developers are switching from heavy Electron apps (Postman, Insomnia) and basic text editors (VS Code extensions, BBEdit) to JsonXmlEditor for daily payload debugging because it combines instant formatting, REST testing, and multi-language DTO generation in a lightweight 6MB native macOS app.

Can I use JsonXmlEditor as a native macOS JSON Linter?

Yes. JsonXmlEditor acts as an instant native JSON linter with real-time syntax checking, precise line-and-column error highlighting, inline error markers, and one-click prettify and compress controls.

RESOURCES & HOW-TOS

Guides & Articles for JsonXmlEditor

Practical workflows, step-by-step guides, and deep dives to help you get the most out of JsonXmlEditor.

Need help?

If you have questions, bug reports, or feature requests, contact us and we will respond as quickly as possible.

Open the full support page

Changelog

Release notes for JsonXmlEditor on macOS.

  1. v1.7.2

    New

    • Accessibility: High-contrast color pass across editor panes, tree views, and UI controls.

    Improvements

    • Diagnostics: Standardized error message prefixes across JSON, XML, and YAML validation tools.

    Bug Fixes

    • Rendering: Fixed rare Metal drawing issue causing validation underline visual artifacts.
  2. v1.7.0

    New

    • Added Markdown support
    • Added printing and pdf export of markdown text
    • Added drag and drop for files.

    Updated

    • Changed settings layout
    • Sidebar icons have colors now
    • Hide buttons when no fitting the current document type

    Fixed

    • Fix split view for code and formatted code
  3. v1.6.2

    Fixed

    • Fix smaller UI issues
  4. v1.6.1

    Fixed

    • Fixed navigation freezes on quick switches.
    • Reduced resource usage.
  5. v1.6.0

    New

    • Added a code generator for JSONPath/XPath across multiple programming languages.

    Fixed

    • Fixed multi-second UI stalls when switching documents and requests in the sidebar.

    Updated

    • Improved and hardened syntax highlighting for JSON, XML, and YAML.
    • Several minor UI improvements.
  6. v1.5.0

    New

    • Added a right-click context menu to the formatted JSON panel.
    • Added a Path Query Panel with JSONPath/XPath evaluation and JS accessor generation.
    • Added Copy JSON Path and Open in Path Query Panel context menu items.
    • Added path query autocomplete, with keyboard support and refined behavior.
    • Added document tab rename.
    • Added Tools menu shortcuts.
    • Added JSON key hover highlight.

    Updated

    • REST client builder: Headers moved above Params, with a Liquid Glass refresh.
  7. v1.4.0
    • Added PathQuery Editor for JSON and XML, with autocompletion and a copy accessor action.
    • Added Tools menu in the app window, with all tools and shortcuts.
    • Added Rename... action in the sidebar document context menu.
    • Added Formatted JSON panel context menu for JSON keys, with copy and open options.
  8. v1.2.0
    • Added toolbar action to open clipboard JSON/XML as a new file.
    • Added Swift DTO output and YAML viewer.
    • Added clickable nested JSON detection in string values.
    • Added drag-to-reorder support with grip handles in the sidebar document list.
    • Added a pinned files section to the sidebar with drag-and-drop and context menu support.
    • Added rename support plus creation and modification dates to REST requests.
    • Added opt-in nested JSON detection for the right pane only, off by default.
    • Reworked Settings into a Safari-style toolbar layout with per-pane tabs.
    • Named nested JSON tabs after the source file and JSON key.
    • Showed creation and modification dates in the document sidebar.
    • Inserted nested JSON tabs directly after their source document.
    • Moved REST requests from the tab strip into sidebar navigation.
    • Fixed a bad merge that broke SyntaxHighlighter and added characterization tests.
  9. v1.1.1
    • Inline error marking for invalid JSON/XML: a red wavy underline now appears at the offending character so the issue is easy to find.
    • Validation status now shows the actual parser error with line and column (e.g. Line 3, Col 5: …) instead of a generic "Invalid JSON/XML" label.
    • Click the validation status to jump the cursor directly to the error location.
    • Error message is now scoped to the detected content type β€” JSON-looking input no longer also reports XML parse errors and vice versa.
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