2.0.0 • Public • Published


    Render an array of block text from Sanity to HTML.


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


    const blocksToHtml = require('@sanity/block-content-to-html')
    const client = require('@sanity/client')({
      projectId: '<your project id>',
      dataset: '<some dataset>',
      apiVersion: '2021-03-25',
      useCdn: true
    // `h` is a way to build HTML known as hyperscript
    // See https://github.com/hyperhype/hyperscript for more info
    const h = blocksToHtml.h
    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 = blocksToHtml({
        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 that if only a single block is given as input, the container node will be skipped.
    • 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 (<br/> by default, pass false to render newline character)
    • serializers.unknownType - Override the default serializer for blocks of unknown type, if ignoreUnknownTypes is set to false (the default).
    • serializers.unknownMark - Override the default serializer for marks of unknown type. Defaults to a span without any styling.
    • imageOptions - When encountering image blocks, this defines which query parameters to apply in order to control size/crop mode etc.
    • ignoreUnknownTypes - By default (or when setting this property explicitly to true) it will output a hidden <div> with a warning. By setting this property to false, the renderer will throw an error when encountering unknown block types. The behavior of the unknown type rendering can be customized by specifying a serializer 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 = blocksToHtml({
      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.




    npm i @sanity/block-content-to-html

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