CSV to JSON converter

Convert a CSV table to an array of JSON objects, with numbers, booleans and nested objects preserved. Runs in your browser, free, no sign-up.

    Drop CSV files here or choose files.

    • Up to 50MB and 1,000,000 rows per file
    • Up to 10 files at a time
    • UTF-8 and EUC-KR (legacy Korean Excel) are detected automatically

    Auto-detect is usually enough. If non-Latin text comes out garbled, try EUC-KR.

    Turn off to treat the first row as data. Columns are then named Column1, Column2 and so on.

    Turn off to write every value as a string ("123"). Values with a leading zero stay strings even when on.

    Turns an "address.city" column into { "address": { "city": ... } }.

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    Result

    Add a CSV and click Convert. The JSON file shows up here.

    What to do next

    JSON to XML converter

    Convert JSON to XML.

    CSV to XML converter

    Turn a CSV table into XML.

    CSV to Excel converter

    Turn a CSV into an Excel table.

    How it works

    Add a CSV and click Convert. The header row becomes the keys and each row becomes an object in an array. Encoding and delimiter are detected automatically.

    With the nested objects option on, a dotted header like address.city is grouped into { "address": { "city": ... } }.

    Things to know

    Empty cells are written as empty strings (""). If two headers have the same name, the second is renamed name_2 so no key is overwritten.

    Frequently asked questions

    What shape is the JSON?

    An array with one object per row, for example [{ "name": "Jane Doe", "age": 30 }, ...], saved with two-space indentation.

    Numbers come out as strings.

    Turn on Numbers and true/false as values and 123 becomes 123 and true becomes true. Values with a leading zero (such as phone numbers) and numbers longer than 15 digits stay strings to preserve precision.

    Accented or non-Latin characters look garbled when I open the CSV in Excel.

    Excel misreads a UTF-8 CSV that has no byte order mark (BOM) and treats it as a legacy encoding, so the characters come out wrong. Here, UTF-8 and EUC-KR (a legacy Korean encoding) are told apart automatically when reading, and a UTF-8 BOM is added by default when saving so Excel opens it correctly.

    Do my files get uploaded anywhere?

    No. Everything runs inside this browser tab and the files never leave your device. The results disappear when you close the page, so save what you need.

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