# FiloSottile/mkcert

A simple zero-config tool to make locally trusted development certificates with any names you'd like.

Repository: https://github.com/FiloSottile/mkcert
Canonical: https://ross.abutalabs.com/products/mkcert
Homepage: https://mkcert.dev
Language: Go
License: BSD-3-Clause
License Family: permissive
Topics: https, tls, certificates, local-development, localhost, root-ca, macos, linux, windows, ios, firefox, chrome
Last push: 2024-08-13T13:37:46+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 2991, "days_push": 750, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 59501, forks 3132 (observed 2026-08-28T04:12:18.748075+00:00)

## What it is
mkcert is a zero-config Go CLI tool that creates a local certificate authority and generates locally-trusted TLS certificates for development hostnames like localhost or *.example.test. It automatically installs the local CA into system and Firefox/NSS trust stores on macOS, Linux, and Windows.

## Use cases
- generate locally trusted https certificates for localhost development
- create self-signed certs without browser trust warnings
- set up a local root ca for development
- make wildcard certificates for local test domains like example.test
- serve https locally in chrome and firefox without errors
- generate tls certs for 127.0.0.1 and ::1 in dev

## When to choose
- you need browsers to trust local development certificates with zero configuration
- you want to avoid browser warnings for localhost or custom test domains
- you develop on macOS, Linux, or Windows and need a simple cross-platform cert tool

## When to avoid
- you need certificates trusted by other machines or the public internet
- you need a CA for production or automated server certificate management (use a real CA or ACME client like certbot)
- you cannot safely store the root CA private key on your machine

## Facets
- artifact type: cli-tool
- maturity: stable
- function: security, cryptography, developer-tools, cli
- domain: developer-tools, security, web-development
- platform: windows, cli, cross-platform
- tags: tls-certificates, local-ca, https, localhost, development-certificates, root-ca, nss, zero-config, command-line, macos, linux

## Member repositories
- FiloSottile/mkcert (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:12:18.748075+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 2026-08-29T16:18:12.669555+00:00, confidence not recorded.
  - readme: https://github.com/FiloSottile/mkcert (fetched 2026-08-28T04:12:18.748075+00:00, sha 3e61ce9a68dd)
  - homepage: https://mkcert.dev (fetched 2026-08-28T18:00:29.814169+00:00, sha f81b3d34d673)
- Data as of 2026-08-30T08:39:29.467469+00:00.