# jmapio/jmap

JSON Meta Application Protocol Specification (JMAP)

Repository: https://github.com/jmapio/jmap
Canonical: https://ross.abutalabs.com/products/jmap
Homepage: http://jmap.io
Language: Makefile
License: Apache-2.0
License Family: permissive
Last push: 2026-08-24T05:19:23+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 35, longevity 100
- inputs: {"age_days": 4307, "days_push": 9, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1366, forks 98 (observed 2026-08-28T04:04:31.387329+00:00)

## What it is
The official IETF specification repository for JMAP (JSON Meta Application Protocol), a modern open standard for email clients to access mail stores over HTTP+JSON, replacing IMAP and SMTP submission. It also hosts documentation and resources for the protocol, with ongoing work extending it to contacts and calendars to replace CardDAV/CalDAV.

## Use cases
- replace IMAP with a modern JSON email protocol
- build an email client that syncs efficiently over HTTP
- implement real-time email push notifications
- understand the JMAP specification before implementing a server
- find JMAP libraries and server implementations
- migrate from CardDAV/CalDAV to JMAP for contacts and calendars

## When to choose
- you are building an email client, webmail, or server and want a modern HTTP/JSON protocol instead of IMAP
- you need efficient sync and sub-second push for mailboxes
- you want an open, patent-free IETF standard with OAuth 2.0 support

## When to avoid
- you need MTA-to-MTA SMTP transmission, which JMAP does not replace
- your infrastructure depends on existing IMAP tooling and cannot adopt a new protocol
- you need a ready-to-run implementation rather than a specification document

## Facets
- artifact type: learning-resource
- maturity: active
- function: email, api-framework, http-server, documentation, json
- domain: email, apis, documentation, messaging-platforms, web-development
- platform: cross-platform
- tags: jmap, ietf-standard, email-protocol, imap-replacement, specification, push-notifications, oauth2, web-server

## Member repositories
- jmapio/jmap (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:31.387329+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 2026-08-30T04:41:12.976640+00:00, confidence not recorded.
  - readme: https://github.com/jmapio/jmap (fetched 2026-08-28T04:04:31.387329+00:00, sha f82578736822)
  - homepage: http://jmap.io (fetched 2026-08-29T11:58:23.426024+00:00, sha f288973bec6e)
- Data as of 2026-08-30T08:39:29.467469+00:00.