Is Fastjson Safe?
Fastjson is a NuGet package (smallest, fastest polymorphic JSON serializer) with a Nerq Trust Score of 48.2/100 (D). It is below the recommended threshold of 70. Security: 90/100. Popularity: 0/100. Data sourced from nuget.org, GitHub, and NVD. Last updated: 2026-03-24. Machine-readable data (JSON).
Is Fastjson safe?
NO — USE WITH CAUTION — Fastjson has a Nerq Trust Score of 48.2/100 (D). It has below-average trust signals with significant gaps in security, maintenance, or documentation. Not recommended for production use without thorough manual review and additional security measures.
Trust Score Breakdown
Key Findings
Details
| Author | mgholam |
| Category | nuget |
| Source | N/A |
Safety Guide: Fastjson
What is Fastjson?
Fastjson is a NuGet package — smallest, fastest polymorphic JSON serializer.
How to Verify Safety
Run dotnet list package --vulnerable. Check publisher on nuget.org.
You can also check the trust score via API: GET /v1/preflight?target=fastJSON
Key Safety Concerns for NuGet packages
When evaluating any NuGet package, watch for: dependency vulnerabilities, publisher verification.
Trust Assessment
Fastjson has a Nerq Trust Score of 48/100 (D) and has not yet reached Nerq trust threshold (70+). This score is based on automated analysis of security, maintenance, community, and quality signals.
Key Takeaways
- Fastjson has a Trust Score of 48/100 (D).
- Review carefully before use — below trust threshold.
- Always verify independently using the Nerq API.
Frequently Asked Questions
Is Fastjson safe to use?
What is Fastjson's trust score?
What are safer alternatives to Fastjson?
Does Fastjson have known vulnerabilities?
Is Fastjson's publisher verified?
Disclaimer: Nerq trust scores are automated assessments based on publicly available signals. They are not endorsements or guarantees. Always conduct your own due diligence.