{"data":{"slug":"miller","name":"Miller","tagline":"BSD-2-Clause named-field CSV/TSV/JSON munging (mlr)","category":"devops","categoryName":"DevOps","url":"https://miller.readthedocs.io","github":"https://github.com/johnkerl/miller","pricing":"open-source","hook":"Miller is awk/sed/cut/join/sort for name-indexed data when CSV/TSV/JSON lines need verbs, not a database.","whatsGood":"BSD-2-Clause. johnkerl/miller (`mlr`). Format-aware pipelines over CSV, TSV, JSON, JSON Lines, and more — put, filter, join, stats, reshape with named fields. Docs at miller.readthedocs.io; source github.com/johnkerl/miller.","theCatch":"Vs jq (JSON filter) and DuckDB (SQL over files): Miller is the *named-field CLI verb chain*, not a full SQL engine and not jq’s JSON DSL. Great for tabular streams; heavy analytics and joins may outgrow mlr into DuckDB/Polars. Distinct from yq’s document-shaped transforms.","verdict":"BSD-2-Clause tabular CLI. Free forever; munge CSV/TSV/JSON by field name before you open a notebook.","addedAt":"2026-09-11","featured":false,"domain":"DevOps","subSpecialty":"Tooling","subcategory":"Tooling","tags":["self-host","permissive","license-unclear","active"],"capabilities":["csv","tsv","json"],"surfaces":["Self-host"],"ecosystem":["Go","Multi-platform"],"licenseModel":"OSS/MIT","githubStars":10044,"starsPerWeek":17,"access":"free","archived":false,"repo":{"createdAt":"2015-05-03","pushedAt":"2026-10-15","license":"NOASSERTION","archived":false,"checkedAt":"2026-10-19"}},"related":[{"slug":"github-actions","name":"GitHub Actions","tagline":"CI/CD that lives where your code does"},{"slug":"docker","name":"Docker","tagline":"Container runtime that changed deployment"},{"slug":"kubernetes","name":"Kubernetes","tagline":"Container orchestration at scale"},{"slug":"pulumi","name":"Pulumi","tagline":"Infrastructure as code in real languages"},{"slug":"fly-io","name":"Fly.io","tagline":"Deploy apps to VMs close to your users"}],"links":{"self":"/api/gems/miller","html":"/gems/miller","markdown":"/gems/miller.md","category":"/api/gems?category=devops","categoryPage":"/stacks/devops"}}