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JSONPeek

github.comInfrastructure

PulseGate's liveness check found it on 16 Sep 2026; it is registered on Firefox Add-ons and has been in the index since 16 Sep 2026. How this is checked

JSONPeek is an open-source Firefox extension that passively detects JSONP endpoints during browsing. It can send suspected endpoints to an exploit server for validation, helping security researchers investigate JSONP-related vulnerabilities.

Inferred · not functionally tested

Open SourceWebEmbeddable
JSONPeek preview
Visit github.com

Overview

4 features

Purpose: Identifying and validating potentially vulnerable JSONP endpoints while browsing.

Inferred · not functionally tested

Audience: web security researchers and penetration testers

Inferred · not functionally tested

Functions: Unknown

Interfaces: API: unknown · MCP: unknown · CLI: unknown · Self-hosting: unknown

Recorded constraints: pricing: open_source · license: Open Source · platforms: WEB · deployment: browser, embeddable

Constraint provenance is unknown; confirm requirements with the publisher.

Record sources: github.com · addons.mozilla.org. These links do not verify the individual claims.

JSONPeek sits in PulseGate's Browser DevTools & extensions category. Inferred · not functionally tested: It focuses on identifying and validating potentially vulnerable JSONP endpoints while browsing. Inferred · not functionally tested: It is built as an open-source project for web security researchers and penetration testers. Basis unknown · not verified: The project is open source (Open Source). Basis unknown · not verified: It ships for the web and embeddable surfaces.

It is developed by ACK-J, and it first shipped in 2024. Inferred · not functionally tested: Key capabilities include passive endpoint detection, JSONP identification, and exploit server validation.

Summary written by a language model from the project’s public pages.

Tasks: Inferred · not functionally tested

  • Passive endpoint detection
  • JSONP identification
  • Exploit server validation
  • Firefox integration

Topics: Inferred · not functionally tested

Tags
jsonp-detectionbrowser-securityendpoint-validationpenetration-testing

JSON profile · Text profile · Access guide

Built with & integrations

Runs on
BrowserEmbeddable

Trust & compliance

License
Open Source
Public signals
HTTPSPrivacy PolicyTerms of ServiceOpen SourceFree tierStore listing found
Legal
Privacy Policy Terms of Service

Indexing history

1

What PulseGate has recorded for this listing

  1. Indexed16 Sep · 04:19 UTC
    JSONPeek seen via Firefox Add-ons
    Source: Firefox Add-ons · Open

Frequently asked questions about JSONPeek

What does JSONPeek do?
Inferred · not functionally tested: JSONPeek focuses on identifying and validating potentially vulnerable JSONP endpoints while browsing. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use JSONPeek?
Inferred · not functionally tested: JSONPeek is an open-source project built for web security researchers and penetration testers.
Does JSONPeek have a free plan?
Basis unknown · not verified: Yes — JSONPeek is open source under the Open Source license and free to use.
What platforms does JSONPeek run on?
Basis unknown · not verified: JSONPeek runs on the web and embeddable surfaces.
Is JSONPeek still active?
PulseGate's liveness check found it on 16 Sep 2026.
Who makes JSONPeek?
JSONPeek is developed by ACK-J.
How long has JSONPeek been around?
JSONPeek first shipped in 2024.
Is JSONPeek open source?
Basis unknown · not verified: Yes — JSONPeek is open source under the Open Source license.

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