JSONata Cheatsheet

All mappings expressions are based on JSONata language - this page showcases its most important features useful when creating a mapping.

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1. JSON object source document

The source for each example is derived from the following JSON:

{
  "senderName": "STEDI",
  "customerID": "997321",
  "shipmentID": 3312412,
  "shipment type": "ASAP",
  "address": {
    "street": "1234 Main St.",
    "city": "Los Angeles",
    "state": "CA",
    "country name": "USA",
    "is-europe": false
  },
  "orders": [
    {
      "orderDate": "2021/03/17",
      "productID": "DEG32",
      "quantity": 3,
      "pricePerUnit": 5,
      "volume": "10"
    },
    {
      "orderDate": "2021/10/12",
      "productID": "OIU98",
      "quantity": 100,
      "pricePerUnit": 1,
      "volume": "15"
    },
    {
      "orderDate": "2021/01/07",
      "productID": "PWE47",
      "quantity": 45,
      "pricePerUnit": 500,
      "volume": "35"
    }
  ]
}

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1.1 Retrieving data

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Root-level field

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Nested field in the root object

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Nested field with a dash in its name in the root object

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Nested field in a root level array

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Retrieve an array of items from a root level array

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Retrieve a root-level field with whitespace in its key

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Retrieve a nested field with whitespace in its key

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1.2 Operating on data

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Concatenate two strings, separated by a space

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Multiply two values retrieved from an array together

([-1] retrieves the last item in an array)

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Remove a given character from a string

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Convert a value to a string

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Convert a value to a number

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1.3 String manipulation

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Convert a value to a lowercase string

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Convert a value to an uppercase string

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Truncate a string to only the first 4 characters

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Check if a string contains a given substring

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Get all characters in a string after a given substring

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Replace all /s with - in a string

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Replace all /s with - in in a string (using ~> operator)

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1.4 Conditionals

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Use a conditional to return a value based on a condition

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Use a conditional with a function to return a value based on a condition

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1.5 Filtering data

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Filter data if a given value is greater than N

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Filter data if a given value is equal to X

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Filter data based on a complex condition

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1.6 Counting data

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Count fields based on a greater-than filter expression

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Count fields based on a substring value filter expression

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Count fields based on a substring value with ~> operator

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Add up all values in an array

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Add up all values in an array with ~> operator

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Use $map, $sum and ~> operator to add up all values in an array

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1.7 Variables

In JSONata, any name that starts with a $ is a variable (e.g. $streetName := address.street). A variable can be one of any type in JSONata’s type system.

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Built-in variables

• $ – the variable with no name refers to the context value at any point in the input JSON hierarchy.
• $$ – the root of the input JSON. You can use it to break out of the current context and navigate down a different path.

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Convert a list of fields to the desired format using the built-in $ variable

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Populate an object field using the built-in $$ variable for every item while looping over an array

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Convert value to a string and store it in a variable

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Count all items in an array and return a different result based on its size

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Multiply values across all items in an array and return a boolean flag based on the result

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Positional variables

Positional variables binding can be used to determine at which position in the sequence the current context item is. It can be used following any map, filter or order-by stage in the path.

The variable is available for use within subsequent stages of the path (e.g. within filter predicates or a map operation) and goes out of scope at the end of the path expression.

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Populate order title based on its index within the orders array

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1.8 Dates

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Get the current date & time in ISO 8601 format

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Get the current date & time in 6-character EDI date format

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Get the current date & time in 8-character EDI date format

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Convert a date from yyyy/MM/dd format to DD/MM/YYYY

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Get the month given a date in yyyy/MM/dd format

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Convert a date taken from an array from yyyy/MM/dd format to DD-MM-YYYY

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Convert epoch date to EDI date format

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Convert given UTC date to America/New_York timezone

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2. JSON array-of-objects source document

The source for each example is derived from the following JSON:

[
  {
    "orderDate": "2021/10/12",
    "productID": "OIU98",
    "quantity": 100,
    "pricePerUnit": 1,
    "address": {
      "street": "1234 Main St.",
      "city": "Los Angeles",
      "state": "CA",
      "country name": "USA",
      "is-europe": false
    }
  },
  {
    "orderDate": "2021/01/07",
    "productID": "PWE47",
    "quantity": 45,
    "pricePerUnit": 500,
    "address": {
      "street": "La Rambla",
      "city": "Barcelona",
      "state": "Barcelona",
      "country name": "Spain",
      "is-europe": true
    }
  }
]

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2.1 Retrieving data

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Retrieve a field from the first item of a root-level array

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Retrieve an array of fields from a root-level array

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Retrieve a nested value from a root-level array

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Retrieve a value with a space in its key from a root-level array

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2.2 Operating on data

The data operations expressions operate on the same basis as for the JSON object source documents.

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2.3 String manipulation

The string manipulation expressions operate on the same basis as for the JSON object source documents.

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2.4 Conditionals

The conditionals expressions operate on the same basis as for the JSON object source documents.

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2.5 Filtering data

The data filtering expressions operate on the same basis as for the JSON object source documents.

Instead of selecting an array field, you can select the root array with the $$ selector.

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Get an array of all items based on a filter expression

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2.6 Counting data

The data counting expressions operate on the same basis as for the JSON object source documents.

Instead of selecting an array field, you can select the root array with the $$ selector.

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Count all items in an array based on a greater-than filter expression

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Count all items in an array based on a substring filter expression

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Count all items in an array based on a substring filter expressions using ~> operator

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Sum up all items in an array

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Sum up all items in an array based on a filter expression

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Use $map, $sum and ~> operator to add up all values in an array

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2.7 Variables

Variables operate on the same basis as for the JSON object source documents.

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2.8 Dates

The dates expressions operate on the same basis as for the JSON object source documents.