Pagination and streaming mean a multi-gigabyte JSON file is answerable one slice at a time, and a targeted JSONPath query filters before anything reaches the model's context. That is the whole argument for using this rather than reading the file into the conversation. The `csv` and `markdown` output formats on `json-query` are worth remembering — they turn a query result into something you can read directly rather than more JSON.
A JSON file server written in Rust. It reads files with JSONPath filtering and pagination, runs JSONPath queries with a choice of output formats, writes with several merge strategies, and validates syntax — all against files on disk rather than content pasted into the conversation.
- `json-read` takes a `file_path`, an optional `json_path` filter, `start_index` and `limit` (default 1000), and an `output_format` of `json`, `pretty` or `compact`
- `json-query` runs a JSONPath expression and can return `json`, `pretty`, `compact`, `csv` or `markdown`
- `json-write` writes with a `mode` of `replace`, `merge_shallow`, `merge_deep` or `append`
- `json-validate` checks structure and syntax and reports line and column where it can
- `json-help` has a `topic` argument covering `overview`, `tools`, `jsonpath`, `examples` and `troubleshooting`
- Full JSONPath support including recursive descent (`..field`) and filter expressions (`[?(@.field > value)]`)
- Large files stream rather than load, so memory use stays constant regardless of file size, and line-delimited JSON is detected automatically
A single binary. `cargo install json-mcp-server` is the recommended route; there are also install scripts for Linux, macOS and Windows, pre-built release binaries, `.deb` and `.rpm` packages, and an AUR PKGBUILD. The client entry is just the `json-mcp-server` command with no arguments; it speaks JSON-RPC over stdin and stdout. No account, no key, no network. Verify with `json-mcp-server --version`.
One command — cargo install json-mcp-server