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openreader/docs-site/versioned_docs/version-v2.1.2/reference/environment-variables.md
github-actions[bot] 6606b0ee4a docs: snapshot v2.1.2
2026-04-07 07:17:37 +00:00

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---
title: Environment Variables
toc_max_heading_level: 3
---
This is the single reference page for OpenReader environment variables.
## Quick Reference Table
| Variable | Area | Default | When to set |
| --- | --- | --- | --- |
| `NEXT_PUBLIC_ENABLE_DOCX_CONVERSION` | Client feature flags | `true` unless set to `false` | Set `false` to hide DOCX support |
| `NEXT_PUBLIC_ENABLE_DESTRUCTIVE_DELETE_ACTIONS` | Client feature flags | `true` unless set to `false` | Set `false` to hide destructive actions |
| `NEXT_PUBLIC_ENABLE_TTS_PROVIDERS_TAB` | Client feature flags | `true` unless set to `false` | Set `false` to hide the TTS Provider settings tab |
| `NEXT_PUBLIC_DEFAULT_TTS_PROVIDER` | Client feature flags | `custom-openai` | Override default TTS provider |
| `NEXT_PUBLIC_DEFAULT_TTS_MODEL` | Client feature flags | `kokoro` | Override default TTS model |
| `NEXT_PUBLIC_SHOW_ALL_DEEPINFRA_MODELS` | Client feature flags | `true` unless set to `false` | Set `false` to restrict DeepInfra models |
| `NEXT_PUBLIC_ENABLE_AUDIOBOOK_EXPORT` | Client feature flags | `true` unless set to `false` | Set `false` to hide audiobook export UI |
| `NEXT_PUBLIC_ENABLE_WORD_HIGHLIGHT` | Client feature flags | `true` unless set to `false` | Set `false` to disable word highlight + alignment |
| `API_BASE` | TTS provider | none | Point to your OpenAI-compatible TTS base URL |
| `API_KEY` | TTS provider | `none` fallback in TTS route | Set when provider requires auth |
| `TTS_CACHE_MAX_SIZE_BYTES` | TTS caching | `268435456` (256 MB) | Tune in-memory TTS cache size |
| `TTS_CACHE_TTL_MS` | TTS caching | `1800000` (30 min) | Tune in-memory TTS cache TTL |
| `TTS_MAX_RETRIES` | TTS retry | `2` | Tune retry attempts for upstream 429/5xx |
| `TTS_RETRY_INITIAL_MS` | TTS retry | `250` | Tune initial retry delay |
| `TTS_RETRY_MAX_MS` | TTS retry | `2000` | Tune max retry delay |
| `TTS_RETRY_BACKOFF` | TTS retry | `2` | Tune exponential backoff factor |
| `TTS_UPSTREAM_TIMEOUT_MS` | TTS request timeout | `285000` | Set max upstream TTS request duration before fail-fast |
| `TTS_ENABLE_RATE_LIMIT` | Rate limiting | `false` | Set `true` to enable TTS per-user/IP daily character limits |
| `TTS_DAILY_LIMIT_ANONYMOUS` | Rate limiting | `50000` | Override anonymous per-user daily character limit |
| `TTS_DAILY_LIMIT_AUTHENTICATED` | Rate limiting | `500000` | Override authenticated per-user daily character limit |
| `TTS_IP_DAILY_LIMIT_ANONYMOUS` | Rate limiting | `100000` | Override anonymous IP backstop daily limit |
| `TTS_IP_DAILY_LIMIT_AUTHENTICATED` | Rate limiting | `1000000` | Override authenticated IP backstop daily limit |
| `BASE_URL` | Auth | unset | Required (with `AUTH_SECRET`) to enable auth |
| `AUTH_SECRET` | Auth | unset | Required (with `BASE_URL`) to enable auth |
| `AUTH_TRUSTED_ORIGINS` | Auth | empty | Add extra allowed origins |
| `USE_ANONYMOUS_AUTH_SESSIONS` | Auth | `false` | Set `true` to enable anonymous auth sessions |
| `GITHUB_CLIENT_ID` | Auth/OAuth | unset | Set with `GITHUB_CLIENT_SECRET` to enable GitHub sign-in |
| `GITHUB_CLIENT_SECRET` | Auth/OAuth | unset | Set with `GITHUB_CLIENT_ID` to enable GitHub sign-in |
| `DISABLE_AUTH_RATE_LIMIT` | Rate limiting | `false` | Set `true` to disable auth-layer rate limiting |
| `POSTGRES_URL` | Database | unset (SQLite mode) | Set to switch metadata/auth DB to Postgres |
| `USE_EMBEDDED_WEED_MINI` | Storage | `true` when unset | Set `false` to use external S3-compatible storage only |
| `WEED_MINI_DIR` | Storage | `docstore/seaweedfs` | Override embedded SeaweedFS data directory |
| `WEED_MINI_WAIT_SEC` | Storage | `20` | Tune SeaweedFS startup wait timeout |
| `S3_ACCESS_KEY_ID` | Storage | auto-generated in embedded mode | Set explicitly for stable/external credentials |
| `S3_SECRET_ACCESS_KEY` | Storage | auto-generated in embedded mode | Set explicitly for stable/external credentials |
| `S3_BUCKET` | Storage | `openreader-documents` in embedded mode | Required for external S3-compatible storage |
| `S3_REGION` | Storage | `us-east-1` in embedded mode | Required for external S3-compatible storage |
| `S3_ENDPOINT` | Storage | derived in embedded mode | Set for S3-compatible providers (MinIO/SeaweedFS/R2/etc.) |
| `S3_FORCE_PATH_STYLE` | Storage | `true` in embedded mode | Set per provider requirement |
| `S3_PREFIX` | Storage | `openreader` | Customize object key prefix |
| `RUN_DRIZZLE_MIGRATIONS` | Database migrations | `true` | Set `false` to skip startup Drizzle schema migrations |
| `RUN_FS_MIGRATIONS` | Storage migrations | `true` | Set `false` to skip startup filesystem -> S3/DB migration pass |
| `IMPORT_LIBRARY_DIR` | Library import | `docstore/library` fallback | Set a single server library root |
| `IMPORT_LIBRARY_DIRS` | Library import | unset | Set multiple roots (comma/colon/semicolon separated) |
| `WHISPER_CPP_BIN` | Word timing | unset | Set to enable `whisper.cpp` timestamps |
| `FFMPEG_BIN` | Audio runtime | auto-detected (`ffmpeg-static`) | Override ffmpeg binary path |
## TTS Provider and Request Behavior
### API_BASE
Server-level default base URL for OpenAI-compatible TTS API requests.
- Example: `http://host.docker.internal:8880/v1`
- Used when no `API_BASE` is set in the user's Settings modal
- If the user sets `API_BASE` in **Settings → TTS Provider**, that value takes precedence
- Related docs: [TTS Providers](../configure/tts-providers)
### API_KEY
Server-level default API key for TTS provider requests.
- Example: your provider token, or omit if the provider doesn't require auth
- Used when no `API_KEY` is set in the user's Settings modal
- If the user sets `API_KEY` in **Settings → TTS Provider**, that value takes precedence
- Related docs: [TTS Providers](../configure/tts-providers)
### TTS_CACHE_MAX_SIZE_BYTES
Maximum in-memory TTS audio cache size in bytes.
- Default: `268435456` (256 MB)
### TTS_CACHE_TTL_MS
In-memory TTS audio cache TTL in milliseconds.
- Default: `1800000` (30 minutes)
### TTS_MAX_RETRIES
Maximum retries for upstream TTS failures (429/5xx).
- Default: `2`
### TTS_RETRY_INITIAL_MS
Initial retry delay in milliseconds for TTS upstream requests.
- Default: `250`
### TTS_RETRY_MAX_MS
Maximum retry delay in milliseconds.
- Default: `2000`
### TTS_RETRY_BACKOFF
Exponential backoff multiplier between retries.
- Default: `2`
### TTS_UPSTREAM_TIMEOUT_MS
Maximum upstream TTS request timeout in milliseconds.
- Default: `285000` (285 seconds)
- Applies to outbound provider calls from server routes using shared TTS generation
- Increase for slower providers/models; decrease to fail fast and surface retryable errors sooner
### TTS_ENABLE_RATE_LIMIT
Controls TTS character rate limiting in the TTS API.
- Default: `false` (TTS char limits disabled)
- Set to `true` to enforce `TTS_DAILY_LIMIT_*` and `TTS_IP_DAILY_LIMIT_*`
- For behavior details and examples, see [TTS Rate Limiting](../configure/tts-rate-limiting)
### TTS_DAILY_LIMIT_ANONYMOUS
Anonymous per-user daily character limit.
- Default: `50000`
### TTS_DAILY_LIMIT_AUTHENTICATED
Authenticated per-user daily character limit.
- Default: `500000`
### TTS_IP_DAILY_LIMIT_ANONYMOUS
Anonymous IP backstop daily character limit.
- Default: `100000`
### TTS_IP_DAILY_LIMIT_AUTHENTICATED
Authenticated IP backstop daily character limit.
- Default: `1000000`
## Auth and Identity
### BASE_URL
External base URL for this OpenReader instance.
- Required with `AUTH_SECRET` to enable auth
- Example: `http://localhost:3003` or `https://reader.example.com`
- Related docs: [Auth](../configure/auth)
### AUTH_SECRET
Secret key used by auth/session handling.
- Required with `BASE_URL` to enable auth
- Generate with `openssl rand -hex 32`
- Related docs: [Auth](../configure/auth)
### AUTH_TRUSTED_ORIGINS
Additional allowed origins for auth requests.
- Comma-separated list
- `BASE_URL` origin is always trusted automatically
- Related docs: [Auth](../configure/auth)
### USE_ANONYMOUS_AUTH_SESSIONS
Controls whether auth-enabled deployments can create/use anonymous sessions.
- Default: `false` (anonymous sessions disabled)
- Set `true` to allow anonymous sessions and guest-style flows
- When `false`, users must sign in or sign up with an account
- Related docs: [Auth](../configure/auth)
### GITHUB_CLIENT_ID
GitHub OAuth client ID.
- Enable only with `GITHUB_CLIENT_SECRET`
### GITHUB_CLIENT_SECRET
GitHub OAuth client secret.
- Enable only with `GITHUB_CLIENT_ID`
### DISABLE_AUTH_RATE_LIMIT
Controls Better Auth rate limiting.
- Default behavior: auth-layer rate limiting enabled
- Set to `true` to disable auth-layer rate limiting
- This does not affect TTS character rate limiting
- Related docs: [Auth](../configure/auth)
## Database and Object Blob Storage
### POSTGRES_URL
Switches metadata/auth storage from SQLite to Postgres.
- Unset: SQLite at `docstore/sqlite3.db`
- Set: Postgres mode
- Related docs: [Database](../configure/database)
### USE_EMBEDDED_WEED_MINI
Controls embedded SeaweedFS startup.
- Default behavior: treated as enabled when unset
- Set `false` to rely on external S3-compatible storage
- Related docs: [Object / Blob Storage](../configure/object-blob-storage)
### WEED_MINI_DIR
Data directory for embedded SeaweedFS (`weed mini`).
- Default: `docstore/seaweedfs`
- Related docs: [Object / Blob Storage](../configure/object-blob-storage)
### WEED_MINI_WAIT_SEC
Maximum seconds to wait for embedded SeaweedFS startup.
- Default: `20`
- Related docs: [Object / Blob Storage](../configure/object-blob-storage)
### S3_ACCESS_KEY_ID
Access key for S3-compatible storage.
- Auto-generated in embedded mode if unset
- Set explicitly for stable credentials or external providers
- Related docs: [Object / Blob Storage](../configure/object-blob-storage)
### S3_SECRET_ACCESS_KEY
Secret key for S3-compatible storage.
- Auto-generated in embedded mode if unset
- Set explicitly for stable credentials or external providers
- Related docs: [Object / Blob Storage](../configure/object-blob-storage)
### S3_BUCKET
Bucket name used for document blobs.
- Default in embedded mode: `openreader-documents`
- Required for external S3-compatible storage
- Related docs: [Object / Blob Storage](../configure/object-blob-storage)
### S3_REGION
Region used by the S3 client.
- Default in embedded mode: `us-east-1`
- Related docs: [Object / Blob Storage](../configure/object-blob-storage)
### S3_ENDPOINT
Endpoint URL for S3-compatible storage.
- In embedded mode, defaults to `http://<BASE_URL host>:8333` (or detected host)
- For AWS S3, usually leave unset
- For MinIO/SeaweedFS/R2/B2-style APIs, typically set explicitly
- Related docs: [Object / Blob Storage](../configure/object-blob-storage)
### S3_FORCE_PATH_STYLE
Path-style S3 addressing toggle.
- Default in embedded mode: `true`
- Set according to provider requirements
- Related docs: [Object / Blob Storage](../configure/object-blob-storage)
### S3_PREFIX
Prefix prepended to stored object keys.
- Default: `openreader`
- Related docs: [Object / Blob Storage](../configure/object-blob-storage)
## Migration Controls
### RUN_DRIZZLE_MIGRATIONS
Controls startup migration execution in shared entrypoint.
- Default: `true`
- Set `false` to skip automatic startup Drizzle schema migrations
- Related docs: [Migrations](../configure/migrations), [Database](../configure/database)
### RUN_FS_MIGRATIONS
Controls startup filesystem-to-object-store migration execution in shared entrypoint.
- Default: `true`
- Runs `scripts/migrate-fs-v2.mjs` at startup after DB migrations
- Set `false` to skip automatic storage migration pass
- Related docs: [Migrations](../configure/migrations), [Database](../configure/database), [Object / Blob Storage](../configure/object-blob-storage)
## Library Import
### IMPORT_LIBRARY_DIR
Single directory root for server library import.
- Used when `IMPORT_LIBRARY_DIRS` is unset
- Default fallback root: `docstore/library`
- Related docs: [Server Library Import](../configure/server-library-import)
### IMPORT_LIBRARY_DIRS
Multiple library roots for server library import.
- Separator: comma, colon, or semicolon
- Takes precedence over `IMPORT_LIBRARY_DIR`
- Related docs: [Server Library Import](../configure/server-library-import)
## Audio Tooling and Alignment
### WHISPER_CPP_BIN
Absolute path to compiled `whisper.cpp` binary for word-level timestamps.
- Example: `/whisper.cpp/build/bin/whisper-cli`
- Required only for optional word-by-word highlighting
### FFMPEG_BIN
Absolute path or executable name for the ffmpeg binary used by audiobook/processing routes.
- Resolution order: `FFMPEG_BIN` -> `ffmpeg-static`
- Example: `/var/task/node_modules/ffmpeg-static/ffmpeg`
## Client Runtime and Feature Flags
### NEXT_PUBLIC_ENABLE_DOCX_CONVERSION
Controls whether the experimental DOCX-to-PDF conversion and upload feature is enabled.
- Default: `true` (enabled)
- Set `false` to hide DOCX support in the upload UI
### NEXT_PUBLIC_ENABLE_DESTRUCTIVE_DELETE_ACTIONS
Controls whether the "Delete all user docs" and other bulk-delete buttons are shown in Settings.
- Default: `true` (enabled)
- Set `false` to hide destructive actions (recommended for production)
### NEXT_PUBLIC_ENABLE_TTS_PROVIDERS_TAB
Controls whether the **TTS Provider** section appears in the Settings modal.
- Default: `true` (enabled)
- Set `false` to hide provider/model/API controls in Settings
- Useful when you want provider config locked to environment defaults
### NEXT_PUBLIC_DEFAULT_TTS_PROVIDER
Sets the default TTS provider for new users.
- Default: `custom-openai`
- Example values: `deepinfra`, `openai`, `custom-openai`
### NEXT_PUBLIC_DEFAULT_TTS_MODEL
Sets the default TTS model for new users.
- Default: `kokoro`
- Example values: `hexgrad/Kokoro-82M`, `tts-1`
### NEXT_PUBLIC_SHOW_ALL_DEEPINFRA_MODELS
Controls whether the DeepInfra model list shows all models or just the free tier when no API key is set.
- Default: `true` (show all)
- Set `false` to restrict to free tier models when no API key is provided
### NEXT_PUBLIC_ENABLE_AUDIOBOOK_EXPORT
Controls whether audiobook export UI/actions are shown in the client.
- Default behavior: enabled unless explicitly set to `false`
- Applies in both development and production
- Affects export entry points in PDF/EPUB pages and document settings UI
### NEXT_PUBLIC_ENABLE_WORD_HIGHLIGHT
Controls word-by-word highlighting UI and timestamp-alignment behavior.
- Default behavior: enabled unless explicitly set to `false`
- Applies in both development and production
- Requires working timestamp generation (for example `WHISPER_CPP_BIN`)
- Affects:
- Word-highlight toggles in document settings
- Alignment requests during TTS playback
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