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Get Started with JavaScript Utils Library

This guide will help you get started with Contentstack JavaScript Utils SDK to build apps powered by Contentstack.

Prerequisites

To get started with the JavaScript Utils SDK, you will need:

SDK Installation and Setup

Note: If you are using the JavaScript Contentstack SDK, you don’t need to run the command as '@contentstack/utils' is already imported in the SDK.

Use the following command to install Contentstack JavaScript Utils SDK:

npm i @contentstack/utils

Usage

Let’s learn how you can use Javascript Utils SDK to render embedded items.

Create Render Option

To render embedded items on the front-end, use the renderOption function, and define the UI elements you want to show in the front-end of your website, as shown in the example below:

const renderOption = {
  // to render Supercharged RTE NodeType content like paragraph, link, table, order list, un-order list and more.
  p: (node, next) => {
    return `<p class='class-id'>${next(node.children)}</p>`
  },
  h1: (node, next) => {
    return `<h1 class='class-id'>${next(node.children)}</h1>`
  },
  // to render Supercharged RTE MarkType content like bold, italic, underline, strikethrough, inlineCode, subscript, and superscript
  bold: (text) => {
    return `<b>${text}</b>`
  },
  // to render block-type embedded items
  block: {
    product: (entry, metadata) => {
      return `<div>
        <h2 >${entry.title}</h2>
        <img src=${entry.product_image.url} alt=${entry.product_image.title}/>
        <p>${entry.price}</p>
      </div>`
    },
    // to render the default
    $default: (entry, metadata) => {
      return `<div>
                 <h2>${entry.title}</h2>
                 <p>${entry.description}</p>  
             </div>`
    }
  },
  // to display inline embedded items
  inline: {
    $default: (entry) => {
      return `<span><b>${entry.title}</b> - ${entry.description}</span>`
    }
  },
  // to display embedded items inserted via link
  link: (entry, metadata) => {
    return `<a href="${metadata.attributes.href}">${metadata.text}</a>`
  },
  // to display assets
   display: (asset, metadata) => {
    return `<img src=${asset.url || metadata.attributes.src || metadata.attributes['asset-link']} alt=${metadata.alt}/>`
  }

Basic Queries

Contentstack Utils SDK lets you interact with the Content Delivery APIs and retrieve embedded items from the RTE field of an entry.

Fetch Embedded Item(s) from a Single Entry

Render HTML RTE Embedded object

To get an embedded item of a single entry, you need to provide the stack API key, environment name, delivery token, content type and entry UID. Then, use the includeEmbeddedItems and Contentstack.Utils.render functions as shown below:

import * as Contentstack from 'contentstack'
const stack = Contentstack.Stack({
  api_key: '<API_KEY>', 
  delivery_token: '<ENVIRONMENT_SPECIFIC_DELIVERY_TOKEN>', 
  environment: '<ENVIRONMENT>'})
stack.ContentType('<CONTENT_TYPE_UID>')
  .Entry('<ENTRY_UID>')
  .toJSON()
  .includeEmbeddedItems() // include embedded items
  .fetch()
  .then(entry => {
    Contentstack.Utils.render({ entry, renderOption }) 
})

If you have multiple HTML-based RTE fields in an entry and want to fetch the embedded items from a particular RTE field, you need to provide a path of those RTE fields.

Refer to the example code below:

//code to render embedded item from an RTE field and from another RTE field nested within a group field
Contentstack.Utils.render({ entry, path: ["rte_fieldUid", "group.rtefieldUID"], renderOption })

Render JSON RTE Contents

To get a single entry, you need to provide the stack API key, environment name, delivery token, content type and entry UID. Then, use the Contentstack.Utils.jsonToHTML function as shown below:

import * as Contentstack from  'contentstack'  
const stack = Contentstack.Stack({  
        api_key: '<API_KEY>',  
        delivery_token: '<ENVIRONMENT_SPECIFIC_DELIVERY_TOKEN>',  
        environment: '<ENVIRONMENT>'})  
stack.ContentType('<CONTENT_TYPE_UID>')  
     .Entry('<ENTRY_UID>')  
     .toJSON()  
     .fetch()  
     .then(entry => {  
            Contentstack.Utils.jsonToHTML({ 
                entry, 
                paths: ["rte_fieldUid", "group.rteFieldUID"], 
                renderOption 
            })  
     })

Note: To get all embedded items while fetching an entry with a JSON RTE field use includeEmbeddedItems function.

Fetch Embedded Item(s) from Multiple Entries

Render HTML RTE Embedded object

To get embedded items from multiple entries, you need to provide the content type UID. You can also use the path variable in case the entries have multiple HTML-based RTE fields.

import Contentstack from 'contentstack'
const stack = Contentstack.Stack({
  api_key: '<API_KEY>', 
  delivery_token: '<ENVIRONMENT_SPECIFIC_DELIVERY_TOKEN>', 
  environment: '<ENVIRONMENT>'})
stack.ContentType('<CONTENT_TYPE_UID>')
  .Query()
  .toJSON()
  .where('title', '<entry_title_to_search>')
  .includeEmbeddedItems() // include embedded items
  .find()
  .then(result => { 
    result.forEach(entry => { 
      Contentstack.Utils.render({ entry, path: ['rte', ‘group.rtefieldUID’], renderOption })
    })
})

Render JSON RTE contents

To get multiple entries, you need to provide the stack API key, environment name, delivery token, content type and entry UID. Then, use the Contentstack.Utils.jsonToHTML function as shown below:

import * as Contentstack from  'contentstack'  
const stack = Contentstack.Stack({  
        api_key: '<API_KEY>',  
        delivery_token: '<ENVIRONMENT_SPECIFIC_DELIVERY_TOKEN>',  
        environment: '<ENVIRONMENT>'})  
stack.ContentType('<CONTENT_TYPE_UID>')  
     .Query()  
     .toJSON()  
     .where('title', '<entry_title_to_search>')  
includeEmbeddedItems()
     .find()  
     .then(result => {  
        result.forEach(entry => {  
            Contentstack.Utils.jsonToHTML({ 
                entry, 
                paths: ["rte_fieldUid", "group.rteFieldUID"], 
                renderOption 
            })
        })  
     })
Note:
  • To get all embedded items while fetching an entry with a JSON RTE field use includeEmbeddedItems function.
  • The methods jsonToHTML() and htmlToJson() allow you to transform data between JSON and HTML formats.
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