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NIP-91: AND operator for filters (Formerly NIP-119) #1365

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NIP-91: AND operator for filters (Formerly NIP-119) #1365

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NIP-119
dskvr Jul 15, 2024
b049185
remove 'considerations' and 'index efficiency'
dskvr Aug 29, 2024
c7da9d7
remove rationale
dskvr Sep 23, 2024
b792e36
Update 119.md
dskvr Oct 18, 2024
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Add 91.md, add Filter table to README
dskvr Nov 20, 2025
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hotfix: heading NIP-119 -> NIP-91
dskvr Nov 20, 2025
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# NIP-119: AND Operator in Filters

Enable `AND` within a single tag filter by using an `&` modifier in filters for indexable tags.

```
filters: {
"kinds": [1],
"&t": ["meme", "cat"],
"#t": ["black", "white"]
}
// returns kind `1` events with `t` tags that have both "meme" and "cat" that have the tag "black" or "white"
```

## Rules

- `AND` **MUST** take precedence over `OR`
- Tags used in `AND` **SHOULD NOT** be used in standard `OR` tags [`#`]
- Any tag used in `AND` **SHOULD** be ignored in `OR`