# estree/estree

The ESTree Spec

Repository: https://github.com/estree/estree
Canonical: https://ross.abutalabs.com/products/estree
License: NOASSERTION
License Family: other
Topics: estree, javascript, ast, parsing, specification
Last push: 2026-05-01T13:47:12+00:00

## Health v2 (maintenance only)
Score: 68/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 80, release rhythm 35, longevity 100
- inputs: {"age_days": 4221, "days_push": 124, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 5424, forks 366 (observed 2026-08-28T04:09:17.946852+00:00)

## What it is
The ESTree Spec is a community-maintained specification for the JavaScript AST (Abstract Syntax Tree) format originally produced by SpiderMonkey's parser API. It serves as the lingua franca standard that JavaScript parsing and code-manipulation tools like ESLint, Babel, and Acorn align to.

## Use cases
- understand the AST node format produced by JavaScript parsers
- build a tool that manipulates JavaScript source code via ASTs
- check how a new JavaScript syntax feature should be represented as AST nodes
- implement a JavaScript parser compatible with the ESTree format
- write codemods or linters that traverse JavaScript syntax trees

## When to choose
- you are building or using JavaScript parsing, linting, transpiling, or code-generation tools and need the canonical AST node definitions
- you want to propose or track how new ECMAScript syntax maps to AST structures

## When to avoid
- you need an actual parser implementation rather than a specification document
- you need AST specs for languages other than JavaScript

## Facets
- artifact type: learning-resource
- maturity: active
- function: parser, documentation
- domain: parsers, programming-languages, developer-tools
- platform: cross-platform
- tags: estree, ast, specification, javascript-ast, standard, javascript

## Member repositories
- estree/estree (main) score 68

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:17.946852+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:56:55.641566+00:00, confidence not recorded.
  - readme: https://github.com/estree/estree (fetched 2026-08-28T04:09:17.946852+00:00, sha 2455aefeba0b)
- Data as of 2026-08-30T08:39:29.467469+00:00.