7 Best JSON Editor Libraries for React in 2026 (Viewer & Editor Components)

If you're building a React application that needs to display or edit JSON, you've got plenty of options. Admin dashboards, API explorers, configuration tools, debugging panels: all of these need some way to show structured JSON data to users.

The tricky part is finding a library that fits your specific needs. Some are lightweight viewers that just display data. Others are full editors with syntax highlighting and validation. A few generate complete form UIs from JSON Schema. And then there's Monaco Editor, which gives you the full VS Code experience but adds megabytes to your bundle.

These libraries solve different problems, from read only viewers to full editors. This guide covers seven React friendly options worth considering in 2026, starting with the most practical picks for common use cases.

What Makes a Good React JSON Editor

Before comparing specific libraries, here are the criteria that matter most when choosing a JSON component:

Before comparing specific libraries, here are the criteria that matter most when choosing a JSON component:

1. React native design: A library built specifically for React tends to work better with hooks, state management, and common React patterns.
2. TypeScript support: Good type definitions improve IDE autocomplete and reduce runtime issues. If a library uses any everywhere, it defeats the purpose of TypeScript.
3. Bundle size: React apps often ship directly to browsers, so every kilobyte impacts load time.
4. Controlled component support: You want to pass value and onChange props and keep state in your app, not fight internal library state.
5. Customization: The editor should be themeable and flexible enough to match your design system.

1. @uiw/react-json-view (Best Modern JSON Viewer)

@uiw/react-json-view is a modern, actively maintained JSON viewer component. It's lightweight (around 20KB gzipped), supports both viewing and editing, and works great with React 18+.

The component renders JSON as an interactive, collapsible tree. Each value type (string, number, boolean, null, array, object) is styled differently, making it easy to scan complex structures. Users can expand and collapse nodes, and optionally edit values inline.

Installation and Basic Usage

npm install @uiw/react-json-view

import JsonView from '@uiw/react-json-view';
import { darkTheme } from '@uiw/react-json-view/dark';

const data = {
  user: {
    name: 'Alice',
    email: 'alice@example.com',
    roles: ['admin', 'editor']
  },
  settings: {
    darkMode: true,
    notifications: false
  }
};

function App() {
  return (
    <JsonView
      value={data}
      style={darkTheme}
      collapsed={2}
    />
  );
}

Editable Mode

To enable editing, pass the editable prop:

import JsonView from '@uiw/react-json-view';

function EditableJson() {
  const [data, setData] = useState({
    name: 'John',
    age: 30
  });

  return (
    <JsonView
      value={data}
      editable
      onEdit={(opts) => {
        setData(opts.newData);
      }}
    />
  );
}

Why Choose @uiw/react-json-view

For most React projects that need to display JSON, this is the most balanced pick. The bundle size is reasonable, the API is clean, and it handles both viewing and basic editing well. The dark theme looks good out of the box, and colors can be customized if needed.

The main limitation is that it's a tree view only. There's no code editor mode where users type raw JSON. If you need that, look at Monaco Editor or react-json-editor-ajrm.

npm: @uiw/react-json-view Free, MIT License

2. react-json-view (Legacy but Widely Used)

react-json-view was the original popular JSON viewer for React. It's still widely used and shows up in countless tutorials and Stack Overflow answers.

However, the library is no longer actively maintained. The last release was in 2022, and it doesn't officially support React 18. It still works in most cases due to backwards compatibility, but you may encounter deprecation warnings.

Basic Usage

npm install react-json-view

import ReactJson from 'react-json-view';

function JsonViewer({ data }) {
  return (
    <ReactJson
      src={data}
      theme="monokai"
      collapsed={1}
      enableClipboard={true}
      displayDataTypes={false}
    />
  );
}

Why You Might Still Choose It

If you're maintaining an existing codebase that already uses react-json-view, there's no urgent need to migrate. It still works. For new projects, @uiw/react-json-view is usually the safer choice because it's actively maintained and has better React 18 support.

npm: react-json-view Free, MIT License (no longer actively maintained)

3. Monaco Editor for React (Best for Developer Tools)

Want the full VS Code editing experience in your React app? @monaco-editor/react gives you exactly that. Syntax highlighting, IntelliSense, error detection, JSON Schema validation, and all the keyboard shortcuts developers expect.

Monaco is the obvious choice for developer-facing tools: API testing interfaces, configuration editors for technical users, or any place where users are comfortable editing raw JSON.

Installation

npm install @monaco-editor/react

Basic JSON Editor

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

function JsonCodeEditor() {
  const [value, setValue] = useState(JSON.stringify({ hello: 'world' }, null, 2));

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

JSON Schema Validation

Monaco can validate JSON against a schema in real-time:

import Editor, { useMonaco } from '@monaco-editor/react';
import { useEffect } from 'react';

function JsonEditorWithSchema() {
  const monaco = useMonaco();

  useEffect(() => {
    if (monaco) {
      monaco.languages.json.jsonDefaults.setDiagnosticsOptions({
        validate: true,
        schemas: [
          {
            uri: 'https://myapp.com/schemas/config.json',
            fileMatch: ['*'],
            schema: {
              type: 'object',
              properties: {
                name: { type: 'string' },
                port: { type: 'number', minimum: 1, maximum: 65535 }
              },
              required: ['name']
            }
          }
        ]
      });
    }
  }, [monaco]);

  return (
    <Editor
      height="400px"
      language="json"
      theme="vs-dark"
      defaultValue={JSON.stringify({ name: '', port: 3000 }, null, 2)}
    />
  );
}

The Bundle Size Reality

Monaco adds 2-3 MB to your bundle. The @monaco-editor/react wrapper loads Monaco from a CDN by default, which means the editor code isn't in your bundle, but users still download it. You can configure it to load from node_modules instead if you prefer.

For internal tools where the extra download time is acceptable, Monaco is unmatched in capability. For consumer-facing apps where every kilobyte matters, consider lighter alternatives.

npm: @monaco-editor/react Free, MIT License

4. react-jsonschema-form (Best for Form Generation)

react-jsonschema-form (RJSF) takes a different approach: instead of showing users raw JSON, it generates a proper form UI from a JSON Schema.

Define your data structure in a schema, and RJSF renders appropriate form controls. Strings become text inputs. Booleans become checkboxes. Arrays become repeatable field groups. Enums become dropdowns. Validation is handled automatically based on the schema constraints.

This is ideal when non-technical users need to produce valid JSON without understanding the format. Settings pages, configuration wizards, CMS content editors: these all benefit from the form-based approach.

Installation

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

For Material UI support:

npm install @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',
      minLength: 1
    },
    email: {
      type: 'string',
      title: 'Email Address',
      format: 'email'
    },
    age: {
      type: 'integer',
      title: 'Age',
      minimum: 0,
      maximum: 120
    },
    notifications: {
      type: 'boolean',
      title: 'Enable notifications',
      default: true
    }
  }
};

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)}
    />
  );
}

UI Schema for Layout Control

Use a UI schema to customize how fields are rendered:

const uiSchema = {
  email: {
    'ui:widget': 'email',
    'ui:placeholder': 'you@example.com'
  },
  age: {
    'ui:widget': 'updown'
  },
  notifications: {
    'ui:widget': 'radio',
    'ui:options': {
      inline: true
    }
  }
};

<Form
  schema={schema}
  uiSchema={uiSchema}
  validator={validator}
  formData={formData}
  onChange={(e) => setFormData(e.formData)}
/>

When to Use RJSF

Choose RJSF when your users shouldn't see or type JSON at all. They interact with a familiar form interface, and you receive validated JSON on the backend. The library handles validation, error messages, conditional fields, and complex nested structures.

The tradeoff is the learning curve. You need to understand JSON Schema and possibly write UI schemas for complex layouts. But once you're past that, RJSF eliminates a lot of form-building boilerplate.

GitHub: react-jsonschema-form Free, Apache 2.0 License

5. react-json-editor-ajrm (Best Lightweight Code Editor)

react-json-editor-ajrm provides a code editor experience specifically designed for JSON. Unlike Monaco, which is a general-purpose code editor, this library is optimized for JSON editing and weighs significantly less (around 50KB).

The editor features syntax highlighting, real-time validation, locale support, and customizable themes. It's a good middle ground between a basic textarea and the heavyweight Monaco.

Installation and Usage

npm install react-json-editor-ajrm

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"
      width="100%"
      onChange={(content) => {
        if (!content.error) {
          setData(content.jsObject);
        }
      }}
      colors={{
        background: '#1e1e1e',
        default: '#d4d4d4',
        string: '#ce9178',
        number: '#b5cea8',
        colon: '#d4d4d4',
        keys: '#9cdcfe',
        error: '#f44336'
      }}
    />
  );
}

Error Handling

The onChange callback includes error information:

onChange={(content) => {
  if (content.error) {
    console.log('JSON Error:', content.error);
    // content.error includes line number and error message
  } else {
    console.log('Valid JSON:', content.jsObject);
  }
}}

When to Use This

This library fits when you need a code editor (not tree view) and Monaco is too heavy. It's particularly good for simple JSON editing tasks where users are comfortable typing JSON but don't need VS Code-level features like IntelliSense or multi-cursor editing.

npm: react-json-editor-ajrm Free, MIT License

6. JSON Forms for React (Best Schema-Driven with Flexibility)

JSON Forms is similar to react-jsonschema-form in that it generates forms from JSON Schema. The implementation differs: JSON Forms uses a renderer-based architecture that's highly customizable.

If you've outgrown RJSF's customization options, or you need to integrate with a specific UI library not supported by RJSF, JSON Forms offers more flexibility.

Installation

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' },
    rating: { type: 'integer', minimum: 1, maximum: 5 }
  },
  required: ['name', 'email']
};

const uischema = {
  type: 'VerticalLayout',
  elements: [
    { type: 'Control', scope: '#/properties/name' },
    { type: 'Control', scope: '#/properties/email' },
    { type: 'Control', scope: '#/properties/rating' }
  ]
};

function ConfigEditor() {
  const [data, setData] = useState({ name: '', email: '' });

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

Custom Renderers

JSON Forms' power comes from custom renderers:

import { withJsonFormsControlProps } from '@jsonforms/react';

const RatingControl = ({ data, handleChange, path }) => (
  <div>
    {[1, 2, 3, 4, 5].map((star) => (
      <button
        key={star}
        onClick={() => handleChange(path, star)}
        style={{ color: data >= star ? 'gold' : 'gray' }}
      >
        ★
      </button>
    ))}
  </div>
);

const ratingTester = {
  tester: (uischema, schema) =>
    schema.type === 'integer' && uischema.scope?.endsWith('rating') ? 10 : -1,
  renderer: withJsonFormsControlProps(RatingControl)
};

// Add to renderers array
const customRenderers = [...materialRenderers, ratingTester];

When to Use JSON Forms

Choose JSON Forms when you need maximum control over how form elements render. It integrates with Material UI, Vanilla HTML, and other UI frameworks. The renderer architecture means you can replace any default rendering behavior with custom components while still benefiting from JSON Schema validation.

Website: jsonforms.io Free, MIT License

7. Ace Editor for React (Best Legacy Support)

react-ace wraps the Ace editor, which has been powering web-based code editors since 2010. It's lighter than Monaco and has excellent browser compatibility.

Installation

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(JSON.stringify({ test: 'data' }, null, 2));

  return (
    <AceEditor
      mode="json"
      theme="monokai"
      value={value}
      onChange={setValue}
      name="json-editor"
      width="100%"
      height="400px"
      fontSize={14}
      setOptions={{
        useWorker: true,
        showPrintMargin: false
      }}
    />
  );
}

When to Use Ace

Ace is a solid choice when Monaco is too heavy but you still want a code editor experience. It's about 500KB compared to Monaco's 2-3MB. The JSON mode includes syntax highlighting and basic validation.

If your users need features like IntelliSense or schema-based autocomplete, Ace doesn't provide those. Otherwise, it's reliable and battle-tested.

npm: react-ace Free, BSD License

Library Comparison Table

Tips for Integrating JSON Editors in React

Some lessons from using these libraries in production:

Debounce onChange handlers. JSON editors can fire onChange on every keystroke. For large documents or when you're syncing with an API, debounce the handler to avoid performance issues:

import { useDebouncedCallback } from 'use-debounce';

const debouncedOnChange = useDebouncedCallback((value) => {
  saveToApi(value);
}, 500);

Lazy load heavy editors. Monaco especially should be lazy loaded:

const MonacoEditor = lazy(() => import('@monaco-editor/react'));

function App() {
  return (
    <Suspense fallback={<div>Loading editor...</div>}>
      <MonacoEditor ... />
    </Suspense>
  );
}

Validate parsed JSON before using it. Even if the editor says the JSON is valid, validate the structure your code expects:

const handleChange = (newJson) => {
  try {
    const parsed = JSON.parse(newJson);
    if (!parsed.requiredField) {
      setError('Missing required field');
      return;
    }
    setData(parsed);
  } catch (e) {
    setError('Invalid JSON');
  }
};

Match the editor to your users. Developers love Monaco. Non-technical users are confused by it. Pick the component that matches who will actually use your feature.

Consider SSR implications. Monaco and Ace don't work with server-side rendering out of the box. Use dynamic imports with ssr: false in Next.js:

import dynamic from 'next/dynamic';

const Editor = dynamic(() => import('@monaco-editor/react'), { ssr: false });

Frequently Asked Questions

What's the lightest React JSON viewer?

@uiw/react-json-view at about 20KB gzipped. For read-only display without editing, this is the best choice.

How do I validate JSON against a schema in React?

Monaco Editor has built-in JSON Schema support. For form-based validation, use react-jsonschema-form or JSON Forms. For manual validation with any editor, use the ajv library.

Which library works best with Next.js?

@uiw/react-json-view and react-jsonschema-form work with SSR. Monaco and Ace need to be dynamically imported with ssr: false. See the tip above for the Next.js pattern.

Can I customize the appearance of react-json-view?

Yes. Both @uiw/react-json-view and the original react-json-view support custom themes. Pass a theme prop with color values for different JSON elements.

What happened to react-json-view?

The original react-json-view repository is no longer actively maintained. It still works with React 17 and mostly works with React 18, but for new projects, @uiw/react-json-view is the better choice.

Which Library Should You Use?

For displaying JSON data with optional inline editing, start with @uiw/react-json-view. It's modern, lightweight, and covers most needs.

For developer tools where users expect a code editor, use Monaco Editor. The bundle size is large, but the experience is unmatched.

For non-technical users who need to produce valid JSON through forms, choose react-jsonschema-form for simplicity or JSON Forms for maximum customization.

For a lightweight code editor without Monaco's weight, try react-json-editor-ajrm.

For legacy browser support, react-ace is reliable and well-tested.

Most projects will be well-served by @uiw/react-json-view for display or react-jsonschema-form for input. Add Monaco only when you're building tools for developers who need the power.

Related Reading

If you work with JSON outside React, these guides help:

They cover the same practical problems from different angles: staying strict about validation, keeping formatting consistent, and choosing tools that do not slow down when files get large. Use them when the editor choice is driven by operating system, team standards, or the environment where JSON work happens.

Best JSON Editor Extensions for VS Code

Best JSON Editor Libraries for Angular

Best JSON Editors for Windows

If you need to combine multiple JSON files, the JSON merger tool handles it directly in the browser.