json

json(options?: JsonOptions): JsonAdapter | JsonFileAdapter

// Parse JSON string from body
.transform(json())

// Extract nested data using dot notation
.transform(json({ path: 'data.items' }))

// Custom parsing with getValue
.transform(json({
  from: (b) => b.rawJson,
  getValue: (parsed) => parsed as User[]
}))

// Write to custom field
.transform(json({
  to: (body, result) => ({ ...body, parsed: result })
}))

// Read and parse JSON file
.from(json({ path: './data.json' }))

// With custom reviver
.from(json({
  path: './data.json',
  reviver: (key, value) => {
    if (key === 'date') return new Date(value);
    return value;
  }
}))

// Write with formatting
.to(json({
  path: './output.json',
  indent: 2
}))

// Dynamic paths with directory creation
.to(json({
  path: (exchange) => `./exports/${exchange.body.id}.json`,
  createDirs: true
}))

// With custom replacer
.to(json({
  path: './filtered.json',
  replacer: (key, value) => {
    if (key.startsWith('_')) return undefined;
    return value;
  }
}))