Function for transforming Sanity block content to HyperScript

Usage no npm install needed!

<script type="module">
  import sanityBlockContentToHyperscript from 'https://cdn.skypack.dev/@sanity/block-content-to-hyperscript';



Render an array of block text from Sanity with HyperScript.


npm install --save @sanity/block-content-to-hyperscript


const h = require('hyperscript')
const blocksToHyperScript = require('@sanity/block-content-to-hyperscript')
const client = require('@sanity/client')({
  projectId: '<your project id>',
  dataset: '<some dataset>',
  useCdn: true

const serializers = {
  types: {
    code: props => h('pre', {className: props.node.language}, h('code', props.node.code))

client.fetch('*[_type == "article"][0]').then(article => {
  const el = blocksToHyperScript({
    blocks: article.body,
    serializers: serializers



  • className - When more than one block is given, a container node has to be created. Passing a className will pass it on to the container. Note: see renderContainerOnSingleChild.
  • renderContainerOnSingleChild - When a single block is given as input, the default behavior is to not render any container. If you always want to render the container, pass true.
  • serializers - Specifies the functions to use for rendering content. Merged with default serializers.
  • serializers.types - Serializers for block types, see example above
  • serializers.marks - Serializers for marks - data that annotates a text child of a block. See example usage below.
  • serializers.list - Function to use when rendering a list node
  • serializers.listItem - Function to use when rendering a list item node
  • serializers.hardBreak - Function to use when transforming newline characters to a hard break (default: <br/>, pass false to render newline character)
  • serializers.container - Serializer for the container wrapping the blocks
  • serializers.unknownType - Override the default serializer for for blocks of unknown type, if ignoreUnknownTypes is set to true.
  • imageOptions - When encountering image blocks, this defines which query parameters to apply in order to control size/crop mode etc.
  • ignoreUnknownTypes - If set to true, don't error on unkown block types, but output an hidden div instead with a warning. The default output can be overridden with serializers.unknownType

In addition, in order to render images without materializing the asset documents, you should also specify:

  • projectId - The ID of your Sanity project.
  • dataset - Name of the Sanity dataset containing the document that is being rendered.


Rendering custom marks

const input = [
    _type: 'block',
    children: [
        _key: 'a1ph4',
        _type: 'span',
        marks: ['s0m3k3y'],
        text: 'Sanity'
    markDefs: [
        _key: 's0m3k3y',
        _type: 'highlight',
        color: '#E4FC5B'

const highlight = props => h('span', {style: {backgroundColor: props.mark.color}}, props.children)

const content = blocksToHyperScript({
  blocks: input,
  serializers: {marks: {highlight}}

Specifying image options

  blocks: input,
  imageOptions: {w: 320, h: 240, fit: 'max'},
  projectId: 'myprojectid',
  dataset: 'mydataset'

Customizing default serializer for block-type

const BlockRenderer = props => {
  const style = props.node.style || 'normal'

  if (/^h\d/.test(style)) {
    const level = style.replace(/[^\d]/g, '')
    return h('h2', {className: `my-heading level-${level}`}, props.children)

  return style === 'blockquote'
    ? h('blockquote', {className: 'my-block-quote'}, props.children)
    : h('p', {className: 'my-paragraph'}, props.children)

  blocks: input,
  serializers: {types: {block: BlockRenderer}}


MIT-licensed. See LICENSE.