hughsk/flat

Health v2 · maintenance only

Adoption not part of the score

1816 stars · 197 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A small JavaScript library that flattens nested objects into single-level objects with delimited keys and reversibly unflattens them back. It supports custom delimiters, array preservation, depth limits, and key transformation.

Use cases

• flatten nested javascript objects
• convert nested to flat key-value pairs
• unflatten delimited keys back into nested objects
• prepare nested config objects for environment variables
• preserve arrays while flattening objects
• limit flattening depth of deeply nested data

When to choose

• you need reversible flattening of nested JS objects in Node.js or the browser
• you want configurable delimiters, array safety, and max depth options
• you need a tiny, well-established utility with no dependencies

When to avoid

• you need to flatten deeply nested structures into other formats like CSV or tables
• you are working outside the JavaScript ecosystem
• you need schema-aware or streaming transformation of very large datasets

Facets

library · maturity stable

serialization developer-tools developer-tools files flatten unflatten nested-objects object-manipulation nodejs javascript

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