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Support Article

Connect-REST fails to parse a response which has equals (=) sign



When installing a Pega 7.3 instance (this is not an upgrade from a previous version), error occurs while parsing a JSON response when the element value has the = symbol (equal).

This occurs despite setting json/escapeSpecialCharacters and json/LegacyMapping Dynamic System Settings (DSS).

Error Messages

Error mapping incoming response to .response_POST: com.fasterxml.jackson.core.JsonParseException: Unexpected character ('=' (code 61)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')

Steps to Reproduce

  1. Create a Connect-REST Integration. 
  2. Parse a response which has elements with values containing = (equals) sign. Pega fails to parse the response JSON and displays an exception.

Root Cause

A defect in Pegasystems' code or rules.


The following local change helped to resolve the issue:
  1. Map the JSON response, received by Pega, as a String to a Clipboard property.
  2. Use the adoptJSONObject API to map the string to the Pega data model using the below Java step in the calling activity:

    ClipboardPage stepPage = tools.getstepPage(); 

    catch(Exception e) { 
      throw new PRRuntimeException(e); 

Published March 29, 2019 - Updated October 8, 2020

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