Miller

Spec sheet

Purpose

Miller is a command-line tool for querying, shaping, and reformatting data files in formats including CSV, TSV, JSON, JSON Lines, YAML, and DCF.Read 8 Oct 2026 · miller.readthedocs.io

Intended users

The author describes use across disciplines including DevOps, data science, and biology/genomics, while noting that many users focus on CSV.Read 8 Oct 2026 · miller.readthedocs.io

Platforms

The installation page lists binaries or installation methods for Linux, macOS, and Windows.Read 8 Oct 2026 · miller.readthedocs.io

Integrations

The documentation describes Miller as complementary to R, pandas, SQL databases, and the Unix toolkit.Read 8 Oct 2026 · miller.readthedocs.io

Support

The project directs users to GitHub Discussions for general questions, Stack Overflow for tagged questions, and GitHub Issues for bug reports and feature requests.Read 8 Oct 2026 · miller.readthedocs.io

License

The project repository identifies Miller's license as two-clause BSD.Read 8 Oct 2026 · github.com

AI support

Miller includes an MCP server in its executable so AI agents and MCP clients can discover and use Miller tools.Read 8 Oct 2026 · miller.readthedocs.io

Data operations

It can add and remove fields, sort, aggregate statistics, pretty-print data, and convert between formats.Read 8 Oct 2026 · github.com

Distribution

Installation options include package managers such as apt, yum, Homebrew, MacPorts, Chocolatey, Snap, and Conda, as well as building from source.Read 8 Oct 2026 · miller.readthedocs.io

MCP transport

The MCP server uses JSON-RPC over stdin/stdout and opens no network port.Read 8 Oct 2026 · miller.readthedocs.io

Named fields

Miller works with named fields in key-value data without requiring users to count positional column indices.Read 8 Oct 2026 · miller.readthedocs.io

Record schemas

Miller can process interleaved records with different field names.Read 8 Oct 2026 · miller.readthedocs.io

Runtime

Miller is written in Go and has no runtime dependencies; it can be downloaded or compiled as a single binary.Read 8 Oct 2026 · miller.readthedocs.io

Streaming

Most operations process one record at a time, allowing Miller to work with files larger than available RAM when the operation permits.Read 8 Oct 2026 · miller.readthedocs.io

Plans and prices

Every Miller plan and price →

Where Specifiction places it

• Data Transformation Tools#25 of 377.6