neuroimjsNeuroimaging for JavaScript

Volumetric data, NIfTI I/O, spatial transforms, and live WebGL brain viewers — in the browser and in Node.

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Volumes, 4D & beyond

Dense, sparse, clustered, and logical volumes; 4D time-series (NeuroVec) and 5D+ hyper-volumes — all backed by typed arrays.

Data structures

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NIfTI I/O

Read NIfTI-1/2 in the browser or Node and write NIfTI-1 from Node, with gzip, intensity scaling and affine-aware spatial metadata.

Reading & writing

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Live WebGL viewers

Orthogonal and composable slice viewers rendered with PIXI.js — the same components powering the brain on this page.

Viewers

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Coordinate-system aware

Grid, world (mm), and image spaces with explicit affine transforms and anatomical orientations.

Coordinate systems

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Spatial processing

Gaussian, bilateral and guided filtering, morphology, and multi-kernel resampling over typed-array volumes.

Processing

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Analysis primitives

Searchlight iterators, connected components, clustering, and statistics for in-browser analysis pipelines.

Analysis

See it run

Everything below is a real neuroimjs viewer rendering the MNI152 template with a statistical overlay. Nothing here is a screenshot or a video. Click or drag to move the crosshair, scroll to change slices (Ctrl/⌘-scroll zooms), and use the panel on the right to change the overlay's colormap, range, threshold and opacity.

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MNI — mmT1w —z —Synthetic z-map (illustrative) on the MNI152 template.

The layout is one SimpleOrthogonalViewer, and the side panel is the library's <layer-control-panel> web component bound to the same VolStack. See the full source →

Pre-1.0 — and actively hardening

neuroimjs is at 0.6.0. The viewer stack, core data structures, NIfTI reading, geometry, processing, and analysis primitives are covered by a green test suite, and NIfTI reading is checked against nibabel-generated fixtures. Some paths still have confirmed bugs or limitations (NIfTI transform selection in a few edge cases, hypervector reductions, a few processing edge cases), and 4D writing is still experimental; the Stability matrix lists the verified status of every feature, so you know what is safe to build on.