Apex Developer Guide

Getting Started
Writing Apex
Ways to Invoke Apex
Invoking Apex
Apex Transactions and Governor Limits
Using Salesforce Features with Apex
Integration and Apex Utilities
Invoking Callouts Using Apex
JSON Support
Roundtrip Serialization and Deserialization
JSON Generator
JSON Parsing
XML Support
Securing Your Data
Encoding Your Data
Using Patterns and Matchers
Finishing Touches
Reference
Appendices
Glossary
PDF

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JSON Parsing

Use the JSONParser class methods to parse JSON-encoded content. These methods enable you to parse a JSON-formatted response that's returned from a call to an external service, such as a web service callout.

The following are samples that show how to parse JSON strings.

Example: Parsing a JSON Response from a Web Service Callout

This example parses a JSON-formatted response using JSONParser methods. It makes a callout to a web service that returns a response in JSON format. Next, the response is parsed to get all the totalPrice field values and compute the grand total price. Before you can run this sample, you must add the web service endpoint URL as an authorized remote site in the Salesforce user interface. To do this, log in to Salesforce and from Setup, enter Remote Site Settings in the Quick Find box, then select Remote Site Settings.

Example: Parse a JSON String and Deserialize It into Objects

This example uses a hardcoded JSON string, which is the same JSON string returned by the callout in the previous example. In this example, the entire string is parsed into Invoice objects using the readValueAs method. This code also uses the skipChildren method to skip the child array and child objects and parse the next sibling invoice in the list. The parsed objects are instances of the Invoice class that is defined as an inner class. Because each invoice contains line items, the class that represents the corresponding line item type, the LineItem class, is also defined as an inner class. Add this sample code to a class to use it.