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esql-js
</h1>
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ES|QL (Elasticsearch Query Language) tooling for JavaScript and TypeScript: parsing, AST manipulation, pretty-printing, query building, editor integrations, and syntax highlighting. This is a monorepo with multiple packages; see the [Packages](#packages) section below.
## Packages
Syntax highlighting grammars:
| Package | npm | Description |
|---------|-----|-------------|
| [`@elastic/monaco-esql`](packages/monaco-esql/) | [](https://www.npmjs.com/package/@elastic/monaco-esql) | **Monaco Editor** language support for ES\|QL (syntax highlighting via Monarch) |
| [`@elastic/prismjs-esql`](packages/prismjs-esql/) | [](https://www.npmjs.com/package/@elastic/prismjs-esql) | **Prism.js** / **`refractor`** grammar for ES\|QL syntax highlighting |
| [`@elastic/textmate-esql`](packages/textmate-esql/) | [](https://www.npmjs.com/package/@elastic/textmate-esql) | **TextMate** grammar for ES\|QL syntax highlighting |
ES|QL language tooling:
| Package | npm | Description |
|---------|-----|-------------|
| [`@elastic/esql`](packages/esql/) | [](https://www.npmjs.com/package/@elastic/esql) | Core package — ES\|QL parser, AST builder, traversal, mutation, pretty-printing, and the `esql` composer tag |
| [`@elastic/esql-types`](packages/esql-types/) | [](https://www.npmjs.com/package/@elastic/esql-types) | Pure TypeScript type definitions for ES\|QL and PromQL ASTs; zero runtime code |
| [`@elastic/esql-definitions`](packages/esql-definitions/) | [](https://www.npmjs.com/package/@elastic/esql-definitions) | Language definitions, docs, and the ES\|QL profile response schema synced from `elastic/elasticsearch` |
| [`@elastic/elasticsearch-esql-dsl`](packages/esql-dsl/) | [](https://www.npmjs.com/package/@elastic/elasticsearch-esql-dsl) | Fluent, type-safe ES\|QL query builder — builds query strings from method chains |
| [`@elastic/elasticsearch-query-builder`](packages/query-builder/) | [](https://www.npmjs.com/package/@elastic/elasticsearch-query-builder) | Shared query-building primitives: operator symbols, escaping helpers, base expression type |
| [`@elastic/pretty-printer`](packages/pretty-printer/) | [](https://www.npmjs.com/package/@elastic/pretty-printer) | Standalone Wadler-Lindig document algebra and layout engine; no ES\|QL knowledge |
| [`@elastic/esql-grammar`](packages/esql-grammar/) | [](https://www.npmjs.com/package/@elastic/esql-grammar) | Auto-generated ANTLR4 TypeScript artifacts for the ES\|QL grammar |
| [`@elastic/esql-promql-grammar`](packages/esql-promql-grammar/) | [](https://www.npmjs.com/package/@elastic/esql-promql-grammar) | Auto-generated ANTLR4 TypeScript artifacts for the embedded PromQL grammar |
## Quick start
The main package for working with ES|QL language is `@elastic/esql`. See [`packages/esql/`](packages/esql/) for the full `@elastic/esql` API reference.
```bash
npm install @elastic/esql
```
Parse a query:
```ts
import { Parser } from '@elastic/esql';
const { root, errors } = Parser.parse('FROM index | WHERE col > 100');
```
Build a parameterized query with the `esql` composer:
```ts
import { esql } from '@elastic/esql';
const query = esql`FROM index | WHERE @timestamp >= ${{ start }} | LIMIT ${{ limit }}`;
console.log(query.toRequest());
// { query: 'FROM index | WHERE @timestamp >= ?start | LIMIT ?limit', params: [...] }
```
Build a query programmatically with importing ES|QL parser:
```ts
import { ESQL, E, f } from '@elastic/elasticsearch-esql-dsl';
const query = ESQL.from('employees')
.where(E('still_hired').eq(true))
.stats({ avg_salary: f.avg('salary') })
.by('department')
.limit(10);
console.log(query.render());
```
## Licences
This repository contains multiple packages with different licences. See each package's `package.json` for the full licence text.