Developer Formatting

JSON empty value remover

Input

{"a":1,"b":null,"c":"","d":[],"e":{"f":null}}

What to do

Indent

Output

{
  "a": 1
}

Processed in your browser · nothing is uploaded

Local · false and 0 are kept

Strips null, empty strings, empty arrays and empty objects recursively — so a branch left empty because its contents were removed is removed too.

How to use the json empty value remover

1 Paste your input. The result appears immediately.

2 Pick the operation you want.

3 Copy the result, or save it as a file.

Recursion is the part naive implementations skip: removing a null inside an object can leave that object empty, and leaving the husk behind defeats the purpose. Working bottom-up handles it. Be careful about what counts as empty, though — this treats null and the empty string as removable and keeps `false` and `0`, because those are meaningful values and dropping them is a real bug. If your API distinguishes "absent" from "explicitly null", this changes the meaning of the document rather than tidying it.

Questions

Does it remove false and zero? −

No. Those are meaningful values. Only null, empty strings and empty containers go.

Is it recursive? +

Does removing null change the meaning? +

Are empty arrays removed? +

Is my data sent anywhere? +

Sources

ECMA-404 — the JSON data interchange syntax MDN — JSON.parse()

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