Crate

indexmap

Hash map that preserves insertion order.

What it is

IndexMap is a hash table that preserves the order entries were inserted, while offering O(1) average lookup, insertion, and removal. It supports indexed access by position and bidirectional iteration in insertion order.

Why it is commonly used

Used when a map needs deterministic iteration order — JSON serialization where key order should be preserved, configuration parsing, and any case where the order entries were added carries meaning.

803
Repositories
90%
Actively maintained
715
Updated ≤ 30 days
3.7M
Total stars
697
Owners

Counted from the Cargo.toml manifests of the 803 indexed repositories that declare indexmap as a dependency — not download counts. Dependency data last verified 2026-09-16.

Browse 803 repositories using indexmap in Repos →
Often used with

Crates that show up unusually often in indexmap projects. The most distinctive pairings rank first — crates these projects use far more than the average indexed Rust project does, not just crates that are popular everywhere. Each percentage is the share of indexmap projects that also use it.

Used by these organizations
50 of 803 repositories · ranked by stars · 715 pushed in the last 30 days
hyperswitch44kactive

Open source, composable payments platform | PCI compliant | SaaS and Self-host options | Enables connectivity to multiple payment, payout, fraud, vault and tokenization providers | Uplifts authorization with intelligent routing and revenue recovery | Reduce payment processing costs with cost observability | Reduces payment ops with reconciliation

servo38kactive

Servo aims to empower developers with a lightweight, high-performance alternative for embedding web technologies in applications.

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qdrant35kactive

Qdrant - High-performance, massive-scale Vector Database and Vector Search Engine for the next generation of AI. Also available in the cloud https://cloud.qdrant.io/

neon23kactive

Neon: Serverless Postgres. We separated storage and compute to offer autoscaling, code-like database branching, and scale to zero.

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sonic21kactive

🦔 Fast, lightweight & schema-less search backend. An alternative to Elasticsearch that runs on a few MBs of RAM.

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