Is JSON Formatter Safe? — Extension Safety Profile
Quick verdict: JSON Formatter earns a safety grade A, 80.3 out of 100, based on 5 of 5 dimensions.
80.3/100
Grade A · 5 of 5 checks
What we found
Automated safety profile from public signals (the extension's manifest & permissions, store listing, publisher, privacy policy). A full review hasn't been published yet.
What this safety grade means
JSON Formatter earns a safety grade of A (80.3/100), measured across 5 of 5 dimensions. Its strongest area is Maintenance & Ownership (100%). The weakest is Publisher & Identity (60%) — what holds its grade back the most.
On the public records we can check, JSON Formatter comes through cleanly. 2,000,000 active users/installs reported on the store. Store rating 4.3/5 from 2,100 user ratings. Last updated on the store 2026-05-16. This is an automated profile, not a hands-on review — so treat the grade as a starting point: open JSON Formatter's own store listing and privacy policy before installing, and weigh it against the other developer tools extensions we track below.
Safety Signals
Based on 5 of 5 safety dimensions
| Dimension | Score | Bar | Source |
|---|---|---|---|
| Publisher & Identity | 60% · 4.8/8 pts 2 of 5 checks verified | Automated signals | |
| Permissions & Access | 75% · 18.7/25 pts 3 of 3 checks verified | Automated signals | |
| Data & Privacy | 83% · 13.2/16 pts 4 of 5 checks verified | Automated signals | |
| Maintenance & Ownership | 100% · 7.5/7.5 pts 1 of 2 checks verified | Automated signals | |
| Community Reputation | 92% · 9.2/10 pts 2 of 4 checks verified | Automated signals |
In-depth safety analysis
This extension requests storage permission and host access to all URLs. Storage lets it save settings locally. Host access to all URLs means it can read and modify page content on any website visited. For a JSON formatter, needing to inspect page content to detect and reformat JSON is expected, but all-site access is broader than a tool that only activates on JSON endpoints.
Developer tools with broad host access are sensitive because they can see everything in the browser. A careful user should install such tools only from a trusted source, review what the extension does after updates, and consider restricting site access if the browser allows it. The developer declares that data is not sold or used for unrelated purposes, but these are self-declared practices.
The fact sheet shows strong maintenance and ownership (100%) and community reputation (92%), suggesting active upkeep and general user trust. The weakest dimension is publisher and identity (60%), meaning less verifiable information about the publisher, which is a common caution point for extensions with broad permissions.
AI-assisted analysis of the documented signals above (permissions, store data, privacy practices) — explains what they mean and the risks typical for this category. Not a hands-on test.
What the store listing shows
Who's Behind JSON Formatter?
- Publisher callumlocke.com
Public records identify the publisher, but no individual founders or a separate registered company are named — which is what holds the Publisher & Identity score back. Less public information about who operates an extension means less you can verify about their long-term accountability.
How it compares
Among the 17 Developer Tools extensions we track, JSON Formatter scores higher on safety than 76% of them.
Computed from our own database of assessed Developer Tools extensions — updated as we track more.
Evidence on File (12)
JSON Formatter FAQ
- Is JSON Formatter safe?
- JSON Formatter earns a safety grade of A (80.3/100) on our evidence-based assessment, based on 5 of 5 safety dimensions we could verify from public records. This is an automated profile built from public records, not a hands-on review.
- Who is behind JSON Formatter?
- JSON Formatter is operated by callumlocke.com.
Alternatives we track
Browse all browser extensions we've checked → · Best Developer Tools extensions