Who should use JSON Viewer?

JSON Viewer is an open-source project built for developers and technical users.

Does JSON Viewer have a free plan?

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

What platforms does JSON Viewer run on?

JSON Viewer runs on the web, the command line, and embeddable surfaces.

Is JSON Viewer still maintained?

Unverified. 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 are alternatives to JSON Viewer?

Similar projects tracked by PulseGate include JSONView, JSON Viewer, and JSON Viewer Pro.

Who makes JSON Viewer?

JSON Viewer is developed by Lysak.

How long has JSON Viewer been around?

JSON Viewer first shipped in 2025.

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JSON Viewer

Name: JSON Viewer
Author: Lysak

github.comBrowser DevTools & extensions

JSON Viewer is an open-source Chrome and Firefox extension that formats JSON and JSONP responses for easier reading in the browser. It is intended for developers and technical users who inspect API responses and other structured data.

Open SourceWebCLIEmbeddable

Visit github.com

Overview

5 features

In the Browser DevTools & extensions space, JSON Viewer takes a focused approach. It focuses on viewing raw JSON and JSONP responses in a readable, formatted browser interface. It is built as an open-source project for developers and technical users. JSON Viewer is open source under the Open Source license. It runs on the web, the command line, and embeddable surfaces.

It is developed by Lysak, and it first shipped in 2025. Among its 5 catalogued features are JSON formatting, JSONP support, and syntax highlighting.

JSON formatting
JSONP support
Syntax highlighting
Collapsible nodes
Browser integration

Built with & integrations

Runs on

BrowserCLIEmbeddable

Trust & compliance

License

Open Source

Verified signals

HTTPSPrivacy Policy Terms of ServiceOpen SourceFree tierStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed14 Sep · 06:16 UTC
JSON Viewer verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about JSON Viewer

What does JSON Viewer do?: JSON Viewer focuses on viewing raw JSON and JSONP responses in a readable, formatted browser interface. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use JSON Viewer?: JSON Viewer is an open-source project built for developers and technical users.
Does JSON Viewer have a free plan?: Yes — JSON Viewer is open source under the Open Source license and free to use.
What platforms does JSON Viewer run on?: JSON Viewer runs on the web, the command line, and embeddable surfaces.
Is JSON Viewer still maintained?: Unverified. 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 are alternatives to JSON Viewer?: Similar projects tracked by PulseGate include JSONView, JSON Viewer, and JSON Viewer Pro.JSONView JSON Viewer JSON Viewer Pro
Who makes JSON Viewer?: JSON Viewer is developed by Lysak.
How long has JSON Viewer been around?: JSON Viewer first shipped in 2025.

At a glance

Pricing: Open Source
Platforms: Web · CLI
Languages: English
License: Open Source
First seen: 14 Sep 2026
Built for: developers and technical users
Model: Open source
Solves: Viewing raw JSON and JSONP responses in a readable, formatted browser interface.

Registered as

Chrome Web Store: infiapocoodhkofhjboemkonbjboopbj
Firefox Add-ons: json-viewer-dev

Developer

Lysak

Index record

Indexed: 14 Sep 2026
Lifecycle: Alive
First seen: Sep 2026
Last seen: 14 Sep 2026

Identity audit (13)

Slug: json-viewer-github-com
Lifecycle state recorded: 14 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 14 Sep 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: Taken from the project's own store listing.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 14 Sep 2026
Canonical URL: https://github.com/Lysak/json-viewer

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