CSV ↔ JSON

Paste CSV (with header) and see the JSON array of objects, or paste a JSON array and see CSV. Auto-detects which way.

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CSV input (first row is the header)

Result

[
  {
    "name": "alice",
    "age": "30"
  },
  {
    "name": "bob",
    "age": "25"
  }
]

How to use

1
Pick a direction
CSV → JSON treats the first row as headers; JSON → CSV expects an array of objects.
2
Paste input
Auto-detect button picks the direction based on whether the input starts with [ or {.
3
Copy result
CSV is RFC 4180-style with proper quoting; JSON is pretty-printed with 2-space indent.

Does it auto-type values?

No. Numbers and booleans stay as strings on CSV → JSON. Type-coercion is opinionated and easy to get wrong; we keep it lossless.

How does JSON → CSV handle missing keys?

It collects the union of keys across all objects as the header, and leaves cells empty for missing values.