Show HN: AI-first open-source alternative to Microsoft and Google Office

InjOffice is a set of browser and server libraries for editing office artifacts. It adds plain-JSON models, pure transformation engines, provider-neutral agent change sets, optional editor integrations, and surgical OOXML patching. A hosted InjOffice service is not required: consumers can use the browser-local WASM engine, run offline, inject their own backend, or opt into the in-repo injoffice-server.

The repository is a monorepo with independently consumable TypeScript packages, private apps, and Go modules. The TypeScript packages target Node.js 22 or newer and modern bundlers. UI integrations use React and, where noted, Univer OSS as an optional editor shell. Univer is not the file authority. Native paint compilers are a preview mode.

Release status (2026-09-08): the source is licensed under Apache-2.0; 25 of 26 npm packages are published at 0.1.0. @injoffice/xlsx-wasm is not yet published. See the release checklist. The scoped v3 Native Office completion matrix is complete; broader format coverage remains partial and this is not Microsoft Office parity.

The original OOXML bytes remain the authority. The supported path is XLSX-first and the same shape for documents and presentations:

1. Go Extract* reads package bytes (xlsxpatch.ExtractNativeWorkbookV1 /ExtractNativeWorkbookV2 ,docxpatch.ExtractNativeDocumentV1 ,pptxpatch.ExtractNativePPTX ).
2. The result is versioned native JSON consumed by @injoffice/sheets ,@injoffice/docs , and@injoffice/pptx-native .
3. TypeScript paint compilers emit renderer-neutral preview commands. Paint is not a save path.
4. Editors emit mutation JSON.
5. Go Apply* writes those mutations back into the original archive.

React, Konva, DOM/HTML layout, screenshots, and Univer must not decide file identity or pass/fail semantics.

Twenty-six TypeScript packages under packages/:

Private workspace apps (not published):

Go modules under go/ are surgical file writers, native extract/apply engines, validators, an optional in-process collaboration hub, and an optional HTTP server:

Each TypeScript package has its own README and five-minute example.

For npm consumers using Univer 0.25.1 (including the collaboration package's peer dependency), add "overrides": { "@univerjs/core": { "nanoid": "5.1.16" } } to your application's root package.json, run npm install, and check npm audit. The repository's override does not propagate to consumers. See the dependency advisory and mitigation.

Prerequisites: Node.js 22+ and the Go versions declared by each module's go.mod.

npm ci
npm run typecheck
npm test
npm run build
npm run check:packages

check:packages imports every built ESM entry and inspects every npm pack payload so source-only or incomplete releases fail in CI.

Run the browser playground with:

npm run dev

Open http://127.0.0.1:3100 directly into Sheets, the first of four comprehensive workspaces: Sheets, Docs, Slides, and PDF. The introduction is removed; legacy #/overview links open Sheets. Existing capabilities from the twenty-six TypeScript packages are grouped inside those examples, not separate sidebar pages. Advanced views use explicitly labelled independent samples where they do not share an artifact model.

Create and edit:

• #/sheets live workbook plus native XLSX inspection and bounded write-back
• #/docs browser-local real DOCX extraction, guarded text write-back, exact-byte readback, and explicit preservation/refusal evidence; it does not claim Word pagination or page-paint
• #/slides DeckSpec authoring, themes, editable transitions, layout QC, and canvas editing
• #/pdf real-file PDF viewing, high-DPI rendering, navigation, zoom, text search, outline inspection, current-page rotation, and download

Within Sheets, Analyze and More tools include:

• #/sheets?feature=charts ,pivots ,shapes ,connectors , andformulas (the old standalone hashes remain compatible bookmarks).

Other capabilities remain inside their relevant tool workspace; these legacy bookmarks still select the corresponding internal view:

• #/agent provider-independent capability discovery, bounded inspection, immutable planning, preview/diff, validation, human approval, atomic commit, verification, and refusal proofs across XLSX, DOCX, PPTX, and PDF-shaped artifacts
• #/history structured workbook and document diffs
• #/pptx-authored ,#/pptx-native , and#/pptx-render , including browser-local bounded PPTX text and AutoShape mutation, exact-byte re-extraction verification, and download
• #/font-metrics browser-safe layout contracts with an explicit Node shaping boundary
• #/collab zero-setup, two-editor browser collaboration simulation for sheets, documents, decks, and PDF annotations, with the HTTP + SSE sidecar proof available as an integration mode

The playground labels the runtime boundary on every route. Most proofs run entirely in the browser. Native XLSX, DOCX, and PPTX extract/apply use version-matched Go WASM engines in browser Workers by default; their server fallbacks are explicit and never automatic. The server-integration collaboration mode stays on the optional Go sidecar. The React shell is not a second OPC writer.

An optional injoffice-server reuses those same extract/mutation handlers and stores packages under opaque artifact IDs (localhost by default):

cd go/injoffice-server
go run ./cmd/injoffice-server

Or, from the repository root:

docker compose up --build

Vite proxies /healthz, /v1/capabilities, /v1/xlsx, /v1/docx, /v1/pptx, and /v1/collab to the server. Compose publishes the server only; it does not run the playground. Start the Vite playground separately, set VITE_INJOFFICE_API_BASE to an explicit server origin to enable XLSX, DOCX, and PPTX fallback, then select it under #/sheets, #/docs, or #/pptx-native; or switch #/collab to its HTTP + SSE integration mode. An empty API base never enables a same-origin fallback. The server is a local development sidecar with no authentication, authorization, tenant isolation, or rate limiting; do not expose it directly to the internet.

Static deployments do not include that local proxy, but the default XLSX, DOCX, and PPTX browser paths need no API. A self-hosted build can set VITE_INJOFFICE_API_BASE to the HTTPS origin of a secured, API-compatible host for the explicit server fallback.

The optional @injoffice/xlsx-wasm, @injoffice/docx-wasm, and @injoffice/pptx-wasm packages wrap the corresponding Go extract/apply functions in browser workers, allowing supported local workflows without the Go sidecar. The playground uses XLSX, DOCX, and PPTX browser paths by default and does not upload package bytes unless the user selects an explicitly configured server fallback. See each package README and the matching go/*patch/cmd/*nativewasm/README.md binding documentation.

Run a Go module independently, for example:

cd go/xlsxpatch
go test ./...

• Native file API. GoExtract* → native JSON (@injoffice/sheets ,@injoffice/docs ,@injoffice/pptx-native ) → TypeScript paint compilers (preview) → mutation JSON → GoApply* .
• Plain data contracts. Native JSON,ChartSpec ,PivotSpec ,DeckSpec , and the wire types are JSON-compatible and independent of a particular host.
• Agent change sets.@injoffice/agent-tools owns a provider-neutral inspect → plan → preview/diff → validate → approve → commit → verify lifecycle. Format adapters advertise exact JSON-schema capabilities and refuse unsupported work; applications retain model, prompt, authorization, storage, and UI control.
• Pure core, optional shell. Aggregation, extraction, diffing, pagination, paint compilation, and mutations can run without React, Univer, or the DOM. Univer is an optional editor shell, not the file authority.
• Optional runtime. Libraries work offline or with a host-injected backend. The XLSX, DOCX, and PPTX WASM runtimes are the playground's browser-local defaults; the in-repoinjoffice-server remains optional for storage, collaboration, and centralized trust or policy enforcement. Public releases contain only generic library and server components, never consumer-specific backend code, authentication configuration, tenant data, or credentials.
• Fail-closed fidelity. Surgical writers start from original OOXML bytes and preserve untouched ZIP parts. If a requested edit cannot be performed safely, it should return an error rather than silently rebuild and discard unsupported content.

The capabilities enumerated by the scoped v3 completion matrix are complete, but native format coverage outside that scope remains partial. Do not assume Microsoft Office, LibreOffice, or unrestricted Excel round-trip parity. See Native Office completion and Public release for the precise status.

InjOffice is pre-1.0. APIs may evolve between minor versions until the public contracts stabilize. Capabilities and limitations are documented per package; roadmap text is not a compatibility guarantee.