• • Code representation format for the JavaScript programming language.
  • JavaScriptExpression is the same as the format RawJSON.
  • MIME type: application/json.
  • Data interchange format.
  • JavaScriptExpression supports full JSON syntax but uses a specific interpretation.
  • JavaScriptExpression identifies JSON objects with Wolfram Language associations.
  • JSON is commonly used in web programming.
  • JSON is an acronym derived from JavaScript Object Notation.
  • JSON is based on a subset of the JavaScript programming language.
  • Plain text format.
  • JSON was developed in 2001.
  • JSON is published as RFC 4627.

• Import ["file","JavaScriptExpression"] imports a JSON file as a combination of nested lists and associations.
• ImportString ["string","JavaScriptExpression"] imports a JSON string.
• Export ["file",expr,"JavaScriptExpression"] exports a combination of nested lists and associations to a JSON file.
• ExportString [expr,"JavaScriptExpression"] exports to a JSON string.
• See the following reference pages for full general information:
• Import , Export import from or export to a file
  CloudImport , CloudExport import from or export to a cloud object
  ImportString , ExportString import from or export to a string
  ImportByteArray , ExportByteArray import from or export to a byte array

• General Import elements:
• "Elements" list of elements and options available in this file
  "Summary" summary of the file
  "Rules" list of rules for all available elements
• Data representation element:
• "Data" contents of a JSON file as nested lists or associations
• Import uses the "Data" element by default.
• The "JavaScriptExpression" format identifies JSON objects of the form {field₁:value₁,field₂:value₂,…} with associations of the form <|"field₁"->value₁,"field₂"->value₂,…|> in the Wolfram Language.
• "JavaScriptExpression" identifies JSON lists [e₁,e₂,…] with Wolfram Language lists {e₁,e₂,…}.
• Strings in the Wolfram Language are represented in JavaScriptExpression as UTF-8 strings, escaped as required by the JSON standard.
• Numbers where scientific notation is used are given in JavaScriptExpression in E notation.
• The symbols True and False are represented in RawJSON as the values true and false.
• The symbol Null is represented as the JSON value null.

• Export options:
• "Compact" False whether to omit line breaks and tabs
  "ConversionFunction" None function to apply for additional conversions
  "ConversionRules" {} rules to apply to override or add conversions
• The setting for "ConversionRules" is used to replace subexpressions before built-in conversions are performed.
• The setting for "ConversionFunction" is applied to subexpressions for which no built-in conversion is defined.
• "Compact"->n includes line breaks and tabs up to indent level n.

Basic Examples  (3)