JSON File Merger
Merge JSON array files locally into one download.
Your inputs
Your inputs and files stay on your device.
Your result
A little input. A useful answer.
Enter your values and run the tool to see your result here.
How to use this tool
- Choose two or more JSON array files.
- Merge them locally.
- Download the combined JSON file.
About JSON File Merger
Combine two or more local JSON array files without uploading their contents.
Does this tool send my data anywhere?
No. Its calculation or transformation happens on your device.
Using JSON File Merger with the right inputs
Merge JSON array files locally into one download. Start by matching your task to the quantities and options shown below. The definitions of the inputs matter as much as the final number or transformed output; retain the original values so that you can repeat or check the result.
Inputs and options explained
- JSON file: choose a local source file and keep the original. The file selector accepts application/json, .json. Check that the file contents match the intended format; renaming an extension does not convert a file.
A practical first-file check
Make a small test file containing the same kind of data as your real file. Keep a copy of the original, choose the settings above and run the operation. Compare the result with the changes you expected before processing the full document. File size, browser memory and the source format can affect whether a large input is usable.
Interpretation and limitations
Keep a copy of the source before transforming structured data. Compare field names, value types, array order and record counts after processing. A syntactically valid document can still violate an application schema or lose information if the selected operation deliberately removes or rewrites fields.
Does successful processing prove that my data is correct?
No. Syntax and transformation checks do not establish business meaning. Verify required fields, identifier values and data types against the system that will consume the result.
Before you use the output
- Choose the intended action: Merge JSON files. Re-run the operation after changing an input or mode so that you are checking the updated result.
- Read the result label and any accompanying explanation. Keep the input values or source file with the output so that a later comparison uses the same assumptions.
- If a result looks unexpected, check units, separators and selected options first. Try a smaller example you can verify rather than repeatedly changing several settings at once.
Questions or a result that needs checking?
If you find a discrepancy, report a problem with JSON File Merger. Include a non-sensitive example, the selected options, the result you expected and the result shown. This makes the issue easier to reproduce. See About & privacy for how the site handles tool inputs.