What is HAR/JSON viewer?

HAR/JSON viewer focuses on inspecting HTTP Archive and JSON files without manually parsing their contents. It is catalogued under Browser DevTools & extensions on PulseGate.

Who should use HAR/JSON viewer?

HAR/JSON viewer is an open-source project built for web developers and network debugging users.

Is HAR/JSON viewer free?

Yes — HAR/JSON viewer is open source under the Open Source license and free to use.

What platforms does HAR/JSON viewer run on?

HAR/JSON viewer runs on the web, embeddable surfaces, macOS, Windows, and Linux.

Is HAR/JSON viewer still maintained?

Unverified. HAR/JSON viewer has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What projects are similar to HAR/JSON viewer?

Similar projects tracked by PulseGate include JSON Viewer, JSON Viewer Pro, and JSON-handle-0419.

Who makes HAR/JSON viewer?

HAR/JSON viewer is developed by Savr Goryaev.

How long has HAR/JSON viewer been around?

HAR/JSON viewer first shipped in 2020.

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HAR/JSON viewer

Name: HAR/JSON viewer
Author: Savr Goryaev

mozilla.orgBrowser DevTools & extensions

HAR/JSON viewer is a Firefox extension that opens HTTP Archive files and JSON data locally or online. It provides switchable HAR, JSON tree, and plain-text views for web developers inspecting network activity.

Open SourceWebEmbeddablemacOSWindowsLinux

Visit mozilla.org

Overview

6 features

HAR/JSON viewer is a Browser DevTools & extensions project. It focuses on inspecting HTTP Archive and JSON files without manually parsing their contents. HAR/JSON viewer is an open-source project aimed at web developers and network debugging users. The project is open source (Open Source). It ships for the web, embeddable surfaces, macOS, Windows, and Linux.

Savr Goryaev builds and maintains HAR/JSON viewer, and it first shipped in 2020. Key capabilities include HAR file viewing, JSON tree view, and plain-text view. The interface is available in 32 languages, including Czech, German, and Greek.

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

HAR file viewing
JSON tree view
Plain-text view
Local file opening
Online file opening
View switching

Built with & integrations

Runs on

BrowserEmbeddablemacOSWindowsLinux

Trust & compliance

License

Open Source

Verified signals

HTTPSPrivacy Policy Terms of ServiceOpen SourceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed9 Sept · 11:48 UTC
HAR/JSON viewer verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about HAR/JSON viewer

What is HAR/JSON viewer?: HAR/JSON viewer focuses on inspecting HTTP Archive and JSON files without manually parsing their contents. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use HAR/JSON viewer?: HAR/JSON viewer is an open-source project built for web developers and network debugging users.
Is HAR/JSON viewer free?: Yes — HAR/JSON viewer is open source under the Open Source license and free to use.
What platforms does HAR/JSON viewer run on?: HAR/JSON viewer runs on the web, embeddable surfaces, macOS, Windows, and Linux.
Is HAR/JSON viewer still maintained?: Unverified. HAR/JSON viewer has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What projects are similar to HAR/JSON viewer?: Similar projects tracked by PulseGate include JSON Viewer, JSON Viewer Pro, and JSON-handle-0419.JSON Viewer JSON Viewer Pro JSON-handle-0419
Who makes HAR/JSON viewer?: HAR/JSON viewer is developed by Savr Goryaev.
How long has HAR/JSON viewer been around?: HAR/JSON viewer first shipped in 2020.

At a glance

Pricing: Open Source
Platforms: Web
License: Open Source
First seen: 9 Sept 2026
Built for: web developers and network debugging users
Model: Open source
Solves: Inspecting HTTP Archive and JSON files without manually parsing their contents.

Registered as

Firefox Add-ons: har-json-viewer

Developer

Savr Goryaev

Index record

Indexed: 9 Sept 2026
Lifecycle: Alive
First seen: Sept 2026
Last seen: 9 Sept 2026

Identity audit (13)

Slug: har-json-viewer-mozilla-org
Lifecycle state recorded: 9 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 9 Sept 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 9 Sept 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/har-json-viewer

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