7 Best JSON Editor Libraries for React in 2026 (Tested & Compared)

React developers need JSON editor components for three scenarios. Display-only viewers for showing API responses. Editable editors with syntax highlighting for developer tools. Form generators that create UI from JSON Schema for non-technical users.

@uiw/react-json-view is actively maintained with optional editing. 20KB gzipped. react-json-view is legacy but widely used. 50KB. Monaco Editor embeds the full VS Code editor. 2MB. JSON Forms generates forms from JSON Schema.

Display-only viewers show JSON as collapsible trees. Users inspect but can't edit. Editable editors provide syntax highlighting and validation. Users modify JSON directly. Schema-driven forms create UI from JSON Schema. Users fill out forms instead of editing raw JSON.

This guide covers seven JSON editor libraries for React with bundle sizes, React 18+ compatibility, and TypeScript support.

1. @uiw/react-json-view

@uiw/react-json-view is a modern JSON viewer component with optional editing. Actively maintained, works with React 18+.

What you get:

• Collapsible tree view for JSON
• Optional inline editing
• Dark theme support
• React 18+ compatible
• Actively maintained
• Bundle size: ~20KB gzipped

What you don't get:

• Code editor experience (tree view, not text editor)
• Syntax highlighting for raw JSON text
• Advanced editing features

Install:

npm install @uiw/react-json-view

Best for: Admin dashboards and internal tools where you need to display JSON with collapsible tree view.

2. react-json-view

react-json-view was the original popular JSON viewer for React. No longer actively maintained (last release 2022), but still widely used.

What you get:

• Collapsible tree view
• Multiple themes (monokai, etc.)
• Clipboard support
• Works with React 17 and mostly with React 18
• Bundle size: ~30KB gzipped

What you don't get:

• Active maintenance (last release 2022)
• React 18 optimizations
• Modern features

Install:

npm install react-json-view

Best for: Maintaining existing codebases that already use it. For new projects, use @uiw/react-json-view instead.

3. Monaco Editor for React

@monaco-editor/react gives you the full VS Code editing experience. Syntax highlighting, IntelliSense, error detection, JSON Schema validation, keyboard shortcuts.

What you get:

• Full VS Code editor experience
• IntelliSense and autocomplete
• JSON Schema validation
• Multi-cursor editing
• Find and replace
• Keyboard shortcuts (Ctrl+F, Ctrl+D, etc.)
• Dark/light themes
• Error detection and inline warnings

What you don't get:

• Small bundle size (2-3MB download)
• Fast initial load
• Simple API (more complex than tree viewers)

Install:

npm install @monaco-editor/react

Basic usage:

import Editor from '@monaco-editor/react';

function JsonCodeEditor() {
  const [value, setValue] = useState('{"hello": "world"}');

  return (
    <Editor
      height="400px"
      language="json"
      theme="vs-dark"
      value={value}
      onChange={(newValue) => setValue(newValue || '')}
      options={{ minimap: { enabled: false } }}
    />
  );
}

Bundle size: 2-3MB (loads from CDN by default, not in your bundle but users still download it)

Best for: Developer-facing tools where users expect a code editor. API testing interfaces, configuration editors for technical users, internal dev tools.

Not great for: Consumer-facing apps where bundle size matters. The 2-3MB download is too heavy for most public-facing products.

4. react-jsonschema-form

react-jsonschema-form (RJSF) generates form UI from JSON Schema. Users interact with a form, you receive validated JSON.

What you get:

• Automatic form generation from schema
• Built-in validation
• Multiple UI frameworks (Material UI, Bootstrap, etc.)
• Custom field widgets
• Array and object field support
• Conditional fields
• Error messages

What you don't get:

• Raw JSON editing (completely hidden)
• Tree view of data structure
• Lightweight bundle (~150KB + UI framework)

Install:

npm install @rjsf/core @rjsf/utils @rjsf/validator-ajv8 @rjsf/mui

Basic usage:

import Form from '@rjsf/mui';
import validator from '@rjsf/validator-ajv8';

const schema = {
  type: 'object',
  required: ['name', 'email'],
  properties: {
    name: { type: 'string', title: 'Full Name' },
    email: { type: 'string', title: 'Email', format: 'email' },
    age: { type: 'integer', title: 'Age', minimum: 0 }
  }
};

function ConfigForm() {
  const [formData, setFormData] = useState({});

  return (
    <Form
      schema={schema}
      validator={validator}
      formData={formData}
      onChange={(e) => setFormData(e.formData)}
      onSubmit={(e) => console.log('Submitted:', e.formData)}
    />
  );
}

Bundle size: ~150KB gzipped (plus UI framework like Material UI)

Best for: Non-technical users who need to produce valid JSON through forms. Settings pages, configuration wizards, CMS content editors.

Not great for: Users who need to see or edit raw JSON. This hides JSON completely behind a form interface.

5. react-json-editor-ajrm

react-json-editor-ajrm is a code editor specifically designed for JSON. Lighter than Monaco, heavier than a tree view.

What you get:

• Syntax highlighting
• Real-time error detection
• Line numbers
• Bracket matching
• Smaller bundle than Monaco (~50KB)
• Localization support

What you don't get:

• IntelliSense or autocomplete
• Multi-cursor editing
• Tree view navigation
• Schema validation
• Advanced editor features

Install:

npm install react-json-editor-ajrm

Basic usage:

import JSONInput from 'react-json-editor-ajrm';
import locale from 'react-json-editor-ajrm/locale/en';

function JsonEditor() {
  const [data, setData] = useState({ name: 'Sample', count: 42 });

  return (
    <JSONInput
      id="json-editor"
      placeholder={data}
      locale={locale}
      height="400px"
      onChange={(content) => {
        if (!content.error) {
          setData(content.jsObject);
        }
      }}
    />
  );
}

Bundle size: ~50KB gzipped

Best for: Code editor experience without Monaco's weight. Users comfortable typing JSON but don't need VS Code-level features.

Not great for: Tree view navigation. This is a text editor, not a collapsible tree. Also not great for advanced features like IntelliSense or multi-cursor editing.

6. JSON Forms

JSON Forms generates forms from JSON Schema with a renderer-based architecture. More customizable than RJSF.

What you get:

• Custom renderer architecture
• Full control over field rendering
• Multiple UI framework support
• Schema-based validation
• Conditional rendering
• Array and nested object support
• Rule-based visibility

What you don't get:

• Simple setup (steeper learning curve)
• Out-of-box styling (requires renderer setup)
• Raw JSON editing
• Lightweight bundle (~100KB + UI framework)

Install:

npm install @jsonforms/core @jsonforms/react @jsonforms/material-renderers

Basic usage:

import { JsonForms } from '@jsonforms/react';
import { materialRenderers, materialCells } from '@jsonforms/material-renderers';

const schema = {
  type: 'object',
  properties: {
    name: { type: 'string' },
    email: { type: 'string', format: 'email' }
  }
};

function ConfigEditor() {
  const [data, setData] = useState({});

  return (
    <JsonForms
      schema={schema}
      data={data}
      renderers={materialRenderers}
      cells={materialCells}
      onChange={({ data }) => setData(data)}
    />
  );
}

Bundle size: ~100KB gzipped (plus UI framework)

Best for: Maximum control over form rendering. Custom renderers let you replace any default behavior while keeping JSON Schema validation.

Not great for: Simple forms where RJSF is easier. JSON Forms has more setup and a steeper learning curve.

7. react-ace

react-ace wraps the Ace editor. Lighter than Monaco, better browser compatibility.

What you get:

• Syntax highlighting
• Multiple themes
• Code folding
• Search and replace
• Better legacy browser support than Monaco
• Smaller than Monaco (~500KB vs 2-3MB)
• Keyboard shortcuts

What you don't get:

• IntelliSense or autocomplete
• Schema validation
• Modern editor features
• Active development (less maintained than Monaco)

Install:

npm install react-ace ace-builds

Basic usage:

import AceEditor from 'react-ace';
import 'ace-builds/src-noconflict/mode-json';
import 'ace-builds/src-noconflict/theme-monokai';

function JsonAceEditor() {
  const [value, setValue] = useState('{"test": "data"}');

  return (
    <AceEditor
      mode="json"
      theme="monokai"
      value={value}
      onChange={setValue}
      width="100%"
      height="400px"
      setOptions={{ useWorker: true }}
    />
  );
}

Bundle size: ~500KB gzipped

Best for: Code editor experience lighter than Monaco. Good for legacy browser support where Monaco might have issues.

Not great for: Advanced features like IntelliSense or schema-based autocomplete. Ace doesn't provide those.

Library Comparison

Recommendation

For a basic viewer in an admin dashboard: @uiw/react-json-view. For a developer tool where users will edit JSON: Monaco. For generating forms from a schema: react-jsonschema-form. Don't reach for Monaco if users just need to view data. The bundle cost isn't worth it.

Frequently Asked Questions

What's the lightest React component for displaying JSON?

@uiw/react-json-view at ~20KB gzipped. It renders JSON as a collapsible tree with syntax highlighting and optional inline editing. For read-only display without any editing, this is the best choice. Install with npm install @uiw/react-json-view. The API is simple: pass your data object to the value prop and it renders immediately.

How do I add a JSON editor to a React admin panel?

Use @uiw/react-json-view for tree view display or Monaco Editor if users need to type raw JSON. For admin panels, @uiw/react-json-view is usually the right pick because it's lightweight and handles both viewing and basic editing. Install with npm install @uiw/react-json-view, pass your data to the value prop, and add editable prop to enable editing.

Can I use Monaco Editor in a Next.js project?

Yes, but you need to disable SSR for Monaco. Use Next.js dynamic imports with ssr: false: const Editor = dynamic(() => import('@monaco-editor/react'), { ssr: false }). Monaco doesn't work with server-side rendering because it relies on browser APIs. The dynamic import ensures Monaco only loads on the client side. This pattern works for any React library that requires browser APIs.

How do I validate JSON input in a React form?

For schema-based validation, use react-jsonschema-form or JSON Forms. Both generate forms from JSON Schema and validate automatically. For manual validation with any editor, use the ajv library: npm install ajv. Create a validator from your schema, then call validate(data) in your onChange handler. Monaco Editor has built-in schema validation if you configure it with monaco.languages.json.jsonDefaults.setDiagnosticsOptions().

What's the difference between react-json-view and Monaco for React?

react-json-view shows JSON as a collapsible tree view (~30KB). Monaco is a full code editor with syntax highlighting, IntelliSense, and schema validation (2-3MB). Use react-json-view for displaying data to users. Use Monaco for developer tools where users type and edit raw JSON. Monaco is 100x heavier but provides a VS Code experience. Don't use Monaco just for display.