Fast and highly configurable JSON to CSV converter.

• Fast and lightweight
• Support for standard JSON as well as NDJSON
• Scalable to infinitely large datasets (using stream processing)
• Advanced data selection (automatic field discovery, underscore-like selectors, custom data getters, default values for missing fields, ...)
• Support for custom input data transformation
• Support for custom csv cell formatting.
• Highly customizable (supportting custom quotation marks, delimiters, eol values, etc.)
• Automatic escaping (preserving new lines, quotes, etc.)
• Optional headers
• Unicode encoding support
• Pretty printing in table format to stdout

There are multiple flavours of json2csv:

• The Plainjs package includes:
  • Parser: Pure Javascript synchronous parser. High-performant and runs both node.js and the browser. It´s the fastes but loads both the JSON and the resulting CSV in memory, and block the event loop while processing. Not recommended unless the JSON data is small.
  • Stream Parser: Pure Javascript stream parser. High-performant and runs both node.js and the browser. It keeps a consistent memory footprint and doesn't block the event loop. It's the base of all other parsers. Recommended to build your own parser.
• The Node packages includes:
  • Node Transform: Wraps the Stream Parser in a Node.js Transform Stream. Recommended for Node.js users using stream.
  • Node Async Parser: Wraps the Node Transform to offer a friendly promise-based API similar to the synchronous Parser. Recommended for Node.js users that want a higher abstraction level.
• The WHATWG package includes:
  • WHATWG Transform Stream: Wraps the Stream Parser in a WHATWG Transform Stream. Recommended for browser users using web streams.
  • WHATWG Async Parser: Wraps the WHATWG Transform Stream to offer a friendly promise-based API similar to the synchronous Parser. Recommended for browser users that want a higher abstraction level.
• The CLI package includes:
  • CLI: Makes the node.js interfaces accesible through the command line. Recommended from CLI (sh/bash/zsh/...) users and CLI scripts.

And a couple of libraries that enable additional configurations:

• The Transforms package includes the built-in transforms for json2csv (unwind and flatten) allowing the using to transform data before is parsed (See docs).
• The Formatters package includes the built-in formatters for json2csv (one for each data type, an excel-specific one, etc.). Formatters convert JSON data types into CSV-compatible strings (See docs).

See https://juanjodiaz.github.io/json2csv.

See LICENSE.md.