JSON Unicode-Escaper
Summary: PortSwigger's BApp Store lists a third-party Burp Suite extension called JSON Unicode-Escaper, version 0.2, by author Jeffrey Cap, last updated 27 March 2025, which provides UTF-8 JSON Unicode-escaping and unescaping as defined in RFC 8259 Section 7. The extension adds a tab with a method dropdown and output area, plus right-click context menu options for requests and responses, and it rejects invalid JSON input with errors shown in the UI and the Extension -> Errors tab.
Why it matters: The extension processes Intruder payloads automatically before they are sent, and its settings update live, so changing custom escape character settings during an active attack can affect ongoing Intruder attacks. PortSwigger states that extensions are written by third-party users of Burp and makes no warranty about their quality or usefulness for any particular purpose.
Read the original at PortSwigger Research ↗
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- Vulnerabilities & Patching
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