Open source Liturgy of the Hours, collaborate to build the best Divine Office library!
Generates liturgical content and calendars of the Roman Rite of the Roman Catholic Church.
Supports Node v18+, Modern Browsers (desktop and mobile).
## Quickstart setup
1. Install with your prefered package manager
```shell [npm]
npm install breviarium
```
```shell [pnpm]
pnpm install breviarium
```
```shell [yarn]
yarn add breviarium
```
2. Import and use the library to retrieve the desired data (ex: Laudes)
Usage:
```ts
const breviarium = new Breviarium(useDateStore().getCurrentDate);
// get laudes for today
await breviarium.getLaudes().then((data) => { console.log("laudes data:", data) })
```
```ts
const breviarium = new Breviarium(useDateStore().getCurrentDate);
// get laudes for a given date (example for 2025-7-30)
await breviarium.getLaudes(new Date(2025, 6, 30)).then((data) => { console.log("laudes data:", data) })
```
## Function Documentation
Liturgy of the hours: functions to retrieve the information of the library:
| Function | Parameters | Description | Example Call |
|-----------------------|---------------|-----------------------------------------------------------|------------------------------------------------|
| `getLaudes` | `date?: Date` | Returns array (1)\: Laudes prayer for a given date. | `prayers.getLaudes();` |
| `getVesperae` | `date?: Date` | Returns array (1)\: the Vesperae prayer for a given date. | `prayers.getVesperae(new Date(2025, 1, 17));` |
| `getOfficium` | `date?: Date` | Returns the Officium prayer for a given date. | `prayers.getOfficium();` |
| `getTertia` | `date?: Date` | Returns the Tertia prayer for a given date. | `prayers.getTertia();` |
| `getSexta` | `date?: Date` | Returns the Sexta prayer for a given date. | `prayers.getSexta(new Date());` |
| `getNona` | `date?: Date` | Returns the Nona prayer for a given date. | `prayers.getNona();` |
| `getCompletorium` | `date?: Date` | Returns the Completorium prayer for a given date. | `prayers.getCompletorium();` |
| `getLectures` | `date?: Date` | Returns the Mass readings for a given date. | `prayers.getLectures();` |
| `getEvangelium` | `date?: Date` | Returns the Gospel text for a given date. | `prayers.getEvangelium(new Date(2025, 5, 1));` |
_(1)_: Some liturgical days, contains different options to pray: memory (example: a saint), and ferial (ordinary time). The Library displays both options and user can choose what version use.
## Test
To run the test suite (with [vitest](https://vitest.dev/)), execute:
To run the app:
```shell
# linux and mac users:
make test
# for windows users:
npm run test
```
## Changelog
See [Changelog.md](./CHANGELOG.md) for breaking changes.
## Debug
> You can debug or see the libraries responses in: https://escribano.breviarium.es/debug select a day, the hour or prayer and display the JSON response
## API Reference — Breviarium
Below is a comprehensive reference for the public API. Each function lists parameters, return type, and a compact output sample. All methods that accept a `date?: Date` will use the instance’s current date when omitted.
### Construction & Date Utilities
- `new Breviarium(selectedDate?: Date)`
- Parameters:
- `selectedDate?: Date` — if omitted, today is used.
- Returns: `Breviarium`
- `setDate(date: Date): void`
- Parameters: `date: Date`
- Returns: `void`
- `getCurrentDate(): Date`
- Parameters: none
- Returns: `Date`
Usage:
```ts
const breviarium = new Breviarium();
breviarium.setDate(new Date(2025, 6, 30));
console.log(breviarium.getCurrentDate());
```
### Liturgy of the Hours — Core Retrieval Methods
- `getInvitatorium(date?: Date): Promise`
- Returns: one Invitatorium entry or `undefined` if not available.
- Output sample:
```json
{
"id": "mary_mother_of_god",
"val": "Antiphon and invitatory text..."
}
```
- `getLaudes(date?: Date): Promise`
- Returns: array of Laudes options (some days have multiple options) or `undefined`.
- Output sample:
```json
[{
"id": "mary_mother_of_god",
"cycle": "ANY",
"himno": "Hymn text...",
"primer_salmo_cita": "Ps 63",
"primer_salmo_antifona": "Ant. ...",
"primer_salmo_texto": "Psalm text...",
"segundo_salmo_cita": "Cantico",
"segundo_salmo_antifona": "Ant. ...",
"segundo_salmo_texto": "...",
"tercer_salmo_cita": "Ps 149",
"tercer_salmo_antifona": "Ant. ...",
"tercer_salmo_texto": "...",
"lectura_biblica_cita": "1Th 5,16-18",
"lectura_biblica": "Reading text...",
"responsorios": ["V. ... R. ..."],
"cantico_evangelico_antifona": "Ant. ...",
"preces_intro": "Intro...",
"preces_respuesta": "Resp...",
"preces_contenido": ["Petition 1", "Petition 2"],
"invitacion_padrenuestro": "Intro...",
"oracion_final": "Collect text..."
}]
```
- `getVesperae(date?: Date): Promise`
- Returns: array of Vespers options or `undefined`.
- Output sample:
```json
[{
"id": "lent_5_monday",
"cycle": "ANY",
"primeras_visperas": false,
"himno": "Hymn text...",
"primer_salmo_cita": "Ps 110",
"primer_salmo_antifona": "Ant. ...",
"primer_salmo_texto": "...",
"segundo_salmo_cita": "Ps 111",
"segundo_salmo_antifona": "Ant. ...",
"segundo_salmo_texto": "...",
"tercer_salmo_cita": "Cantico",
"tercer_salmo_antifona": "Ant. ...",
"tercer_salmo_texto": "...",
"lectura_biblica_cita": "Eph 1,3-10",
"lectura_biblica": "Reading text...",
"responsorios": ["V. ... R. ..."],
"cantico_evangelico_antifona": "Ant. ...",
"preces_intro": "Intro...",
"preces_respuesta": "Resp...",
"preces_contenido": ["Petition 1"],
"invitacion_padrenuestro": "Intro...",
"oracion_final": "Collect text..."
}]
```
- `getOfficium(date?: Date): Promise`
- Returns: Office of Readings object or `undefined`.
- Output sample:
```json
{
"id": "mary_mother_of_god",
"cycle": "ANY",
"himno": "Hymn text...",
"primer_salmo_cita": "Ps ...",
"primer_salmo_antifona": "Ant. ...",
"primer_salmo_texto": "...",
"segundo_salmo_cita": "Ps ...",
"segundo_salmo_antifona": "Ant. ...",
"segundo_salmo_texto": "...",
"tercer_salmo_cita": "Ps ...",
"tercer_salmo_antifona": "Ant. ...",
"tercer_salmo_texto": "...",
"lectura_biblica_titulo_a": "Title ...",
"lectura_biblica_cita_a": "Ref ...",
"lectura_biblica_texto_a": "Text ...",
"lectura_patristica_titulo_a": "Title ...",
"lectura_patristica_cita_a": "Ref ...",
"lectura_patristica_texto_a": "Text ...",
"responsorio1": ["V. ... R. ..."],
"responsorio2_a": ["..."],
"responsorio3_a": ["..."],
"oracion_final": "Prayer text..."
}
```
- `getTertia(date?: Date): Promise`
- `getSexta(date?: Date): Promise`
- `getNona(date?: Date): Promise`
- Returns: Midday prayer object or `undefined`.
- Output sample:
```json
{
"id": "lent_2_monday",
"cycle": "ANY",
"himno": "Hymn text...",
"primer_salmo_cita": "Ps ...",
"primer_salmo_antifona": "Ant. ...",
"primer_salmo_texto": "...",
"segundo_salmo_cita": "Ps ...",
"segundo_salmo_antifona": "Ant. ...",
"segundo_salmo_texto": "...",
"tercer_salmo_cita": "Ps ...",
"tercer_salmo_antifona": "Ant. ...",
"tercer_salmo_texto": "...",
"lectura_biblica_cita": "Ref ...",
"lectura_biblica": "Reading text...",
"responsorios": ["V. ... R. ..."],
"oracion_final": "Prayer text..."
}
```
- `getCompletorium(date?: Date): Promise`
- Returns: Night Prayer object or `undefined`.
- Output sample:
```json
{
"idd": 4,
"himno": "Hymn text...",
"primer_salmo_cita": "Ps ...",
"primer_salmo_antifona": "Ant. ...",
"primer_salmo_texto": "...",
"segundo_salmo_cita": "Ps ...",
"segundo_salmo_antifona": "Ant. ...",
"segundo_salmo_texto": "...",
"lectura_biblica_cita": "Ref ...",
"lectura_biblica_texto": "Reading text...",
"responsorio": ["..."],
"responsorio_pascua": ["..."],
"antifona_triduo": "...",
"antifona_inalbis": "...",
"cantico_evangelico_antifona": "Ant. ...",
"final": "Prayer text..."
}
```
### Mass Readings and Gospel
- `getLectures(date?: Date): Promise`
- Returns: array with the day’s readings sets or `undefined`.
- Output sample:
```json
[{
"id": "lent_5_monday",
"cycle": "ANY",
"lecturas": [
{ "ref": "Jer 14,17-22", "texto": "Reading text...", "type": "FIRSTLECTURE" },
{ "ref": "Ps 79", "texto": "Psalm text...", "type": "PSALM" },
{ "ref": "Mt 13,36-43", "texto": "Gospel text...", "type": "GOSPEL" }
]
}]
```
- `getEvangelium(date?: Date): Promise`
- Returns: Gospel object (subset of lectures) or `undefined`.
- Output sample:
```json
{
"id": "mary_mother_of_god",
"cycle": "ANY",
"evangelium_lectiones": [
{ "ref": "Mt 13,36-43", "texto": "Gospel text...", "type": "GOSPEL" }
]
}
```
### Commons & Liturgy Info
- `getInvitatoriumPsalms(): Promise`
- Returns: list of invitatory psalms (Spanish content in current DB).
- Output sample:
```json
[
{ "id": "psalm94", "title": "Salmo 94: InvitaciĂłn a la alabanza divina", "psalm": "Venid, aclamemos...
" },
{ "id": "psalm99", "title": "Salmo 99: AlegrĂa de los que entran en el templo", "psalm": "Aclama al Señor...
" }
]
```
- `getLiturgyInformation(date?: Date): Promise`
- Returns: metadata about the day: psalter week, cycle, color, celebration, etc. Always returns an object (with minimal defaults when unknown).
- Output sample:
```json
{
"psaltery_week": "I",
"cycle": "A",
"color": "GREEN",
"color_hex": "#008000",
"celebration": "Feria",
"rank": "weekday",
"seasons": ["ORDINARY_TIME"],
"precedence": "weekday",
"periods": ["ORDINARY_TIME"],
"calendar": { "endOfLiturgycalSeason": "2025-11-29" }
}
```