JSON To CSV Converter
Flatten JSON into clean CSV rows and columns fast
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Someone asks for "the data in a spreadsheet" and what you have is a nested API response. How do you flatten that without losing half the fields? The JSON To CSV Converter turns objects into rows and columns, and lets you decide what happens to the nesting.
Short answer: The JSON To CSV Converter is a free tool on EizTools that flattens pasted JSON into CSV rows. Choose the structure and header handling, and it returns a table your spreadsheet can open.
What is JSON To CSV Converter?
It goes the opposite way from most data work. Paste your JSON and the JSON To CSV Converter returns comma separated rows with a header line, ready to paste into a spreadsheet. Like the other converters here, it takes pasted text rather than an uploaded file.
Flattening Nested Data For A Spreadsheet
The hard part is nesting. A user object with an address inside it and an array of orders underneath cannot become one tidy row without a decision. Do you flatten the address into separate columns, or produce one row per order and repeat the user details? Both are valid, and the tool follows whichever you describe.
Header row handling
Add Headers builds the header line from your keys, including flattened paths for nested fields.
Sorting and dedupe
Sort Output and Remove Duplicates tidy an export before it reaches anyone else.
Structure choice
Simple, Detailed, Grouped, Sorted or Custom, which decides how deep the flattening goes.
Headers, Sorting And Duplicates
Set Output Format to CSV and Structure to Simple for a flat one row per object result. Choose Detailed when nested fields need their own columns rather than being dropped. The Options dropdown, with Trim Spaces and Remove Duplicates, handles the mess that arrives with most real exports.
| Your JSON | What to ask for |
|---|---|
| Flat array of objects | Structure Simple, Add Headers on |
| Objects with nested addresses | Structure Detailed, flatten into separate columns |
| Objects with arrays inside | One row per array item, repeating the parent fields |
| Deeply nested API response | Name the fields you actually need in Custom Instructions |
How Does JSON To CSV Converter Work?
- Paste the JSON into the prompt box.
- Select your AI model from the list at the top.
- Set Output Format to CSV, Structure to Detailed, Options to Trim Spaces.
- Turn on Add Headers, and Sort Output if the order does not matter.
- In Custom Instructions, name the fields you want and how to handle arrays.
- Generate, then check the column count on the first three rows before using it.
That last step catches most problems. A row with fewer columns than the header usually means a field was missing in that object, and it is far easier to spot now than after someone has opened the file in a spreadsheet.
Sample first Convert five records before the full set. If the flattening is wrong, you will see it immediately, and you have not spent a long generation producing a file you throw away. Never paste personal or confidential data.
Mistakes To Avoid
- Letting it choose which nested fields to keep, rather than naming them yourself
- Ignoring commas inside text values, which need quoting to survive a spreadsheet
- Converting thousands of records in one paste instead of writing a script
- Assuming column order is stable across two separate runs
Every tool on EizTools is free with no account, built for one job, and you can pick an AI model family before generating. Once the data is tabular, the SQL Generator is a useful next step for the queries or the insert statements that usually follow. Everything else lives in the tool library.
Frequently Asked Questions
How does the JSON To CSV Converter handle nested objects?
It flattens them into columns, typically joining the key names. For arrays, say whether you want one row per item or the values joined into a single cell, since both are common.
Can I choose which fields become columns?
Yes, and you should. List the fields you need in Custom Instructions. A wide API response converted in full produces a spreadsheet nobody can read.
Will it escape commas inside values?
It should quote fields that contain commas or line breaks. Check a few rows with text values before sharing the file, because a broken quote shifts every column after it.
Can I paste a whole API response?
For a small response, yes. Large payloads are better sampled first, then handled with a script. The tool has no upload, so everything goes in as pasted text.
Flattening data is a series of small decisions about what to keep and what to repeat. Make those decisions explicitly in Custom Instructions, check a sample, and the spreadsheet you hand over will actually be readable.
Sabir Bepari
Founder of EizTools and a passionate AI enthusiast dedicated to building practical, user-friendly AI tools that simplify everyday tasks.
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