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JSON Record Field Coalescer

Append a field from the first non-null value among chosen source fields.

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02
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JSON first nonnull field picker online

Append a field from the first non-null value among chosen source fields. Use this when inspecting structured input or preparing a data or code artifact. Generated commands and configurations remain text until you review and use them yourself.

How to use it

Paste JSON matching the structure in the example. Set source fields in order, new field. Choose Run tool. Review the output, then copy or download it.

Options and example settings

Option	Choices / value	Example default
Source fields in order	Enter source fields in order.	nickname,name
New field	Enter new field.	display

Worked examples

Use this when inspecting structured input or preparing a data or code artifact. Generated commands and configurations remain text until you review and use them yourself.

Reproducible worked example

Settings: Source fields in order: nickname,name; New field: display

Input:

[{"nickname":null,"name":"Anna"},{"nickname":"B","name":"Ben"}]

With the input and settings above, the tool produces:

Output:

[
  {
    "nickname": null,
    "name": "Anna",
    "display": "Anna"
  },
  {
    "nickname": "B",
    "name": "Ben",
    "display": "B"
  }
]

The example returns 2 top-level items in an array. Each item is a record; the first record contains “nickname”, “name”, “display”.

Limitations and common mistakes

Results reflect your supplied input and selected settings. Check the worked example and output before reuse.
Combined input is bounded to 150,000 characters; output text is bounded to 1.2 million characters. Some algorithms impose smaller limits, stated in their error messages.

Frequently asked questions

What format should I enter?

Paste JSON matching the structure in the example. The worked example shows the supported structure and actual output.

How can I append a field from the first non-null value among chosen source fields in JSON online?

Paste JSON matching the structure in the example. Set source fields in order, new field. Choose Run tool. Review the output, then copy or download it.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.