Use the first row as property names
Each header cell becomes a JSON key after surrounding whitespace is trimmed. The remaining cells keep their original text, including internal spaces.
Free online converter · no registration or login
Free CSV to JSON Converter Online
Paste CSV or load one local .csv or .txt file, choose the delimiter and JSON format, then convert the header row and records into a JSON array. Quoted fields are parsed in your browser, values stay strings, and no registration or login is required.
- Headers become JSON keys
- Comma, semicolon, or tab
- Quoted fields stay intact
- Copy or JSON download
CSV to JSON workspace
Map rows to JSON objects
The first row becomes property names. Quoted delimiters, doubled quotes, and quoted line breaks are parsed locally; cell values stay strings.
Pasted CSV · Use Ctrl/Command + Enter to convert.
Result
JSON result
Convert a header row and data rows to inspect the object array.
No converted JSON yet
The result will show real object, key, byte, and empty-cell facts after conversion.
How to convert CSV to JSON
Follow the input rules, match the source delimiter, and review the generated object array before using it elsewhere.
- Step 1
Paste CSV or load a local file
Include one header row followed by at least one data row. Pasted text and one local .csv or .txt file are each limited to 5 MB.
- Step 2
Choose the delimiter and JSON format
Select comma, semicolon, or tab to match the source. Choose readable two-space JSON or compact minified output.
- Step 3
Review, copy, or download the array
Convert the rows, confirm the actual object, key, and byte counts, then copy the result or download a valid .json file.
Common CSV to JSON tasks
Use the converter for a focused table-to-object step, then check that the output shape and exact values match your next workflow.
- Turn a spreadsheet export into an API fixture
- Convert semicolon-delimited records to JSON objects
- Preserve ZIP codes and IDs as exact strings
- Parse quoted commas, double quotes, and line breaks
Map headers and rows to JSON objects
The converter uses a deliberate output shape: one header row followed by records that become an array of consistently keyed objects.
Keep headers unique and non-empty
Blank or duplicate headers cannot map predictably to object properties, so the converter reports an error instead of silently overwriting data.
Turn each later row into one object
Every non-empty record must contain the same number of fields as the header. Empty rows are skipped; incomplete or extra fields are reported with the source row number.
Parse quoted CSV fields correctly
Double quotes allow delimiters, quotes, and record breaks to appear inside a value without changing the table structure.
Keep delimiters inside double quotes
A value such as Lovelace, Ada remains one field when comma is the selected delimiter because the comma is inside matching double quotes.
Escape a quote by doubling it
Inside a quoted field, write two double quotes to represent one literal quote. A stray quote after unquoted text is reported instead of guessed.
Preserve line breaks inside quoted fields
A carriage return or newline inside a properly quoted field remains part of the string. Outside quotes, the same character ends the current record.
Keep CSV values exact and conversion local
CSV has no universal schema for numbers, booleans, dates, or nulls. This converter avoids guessing and leaves deliberate coercion to the next application step.
Keep every CSV cell as a string
Values such as 00123, false, 2026-07-20, and null remain strings. This preserves text exactly and avoids silently removing leading zeros or changing identifiers.
Choose pretty or minified JSON
Pretty output uses two-space indentation for review. Minified output removes formatting whitespace but contains the same objects and string values.
Keep conversion in the current browser page
The current page reads and parses up to 5 MB locally. It does not provide delimiter auto-detection, streaming conversion, headerless mode, type inference, or nested output.
CSV to JSON Converter FAQ
Direct answers about headers, delimiters, quoted fields, string values, output formatting, errors, downloads, and local processing.
How do I convert CSV to JSON?
Paste CSV or load one local .csv or .txt file, choose comma, semicolon, or tab, select pretty or minified JSON, and choose Convert to JSON. Review the object, key, and byte facts before copying or downloading.
Does the first CSV row become JSON keys?
Yes. This converter requires a header row. Each trimmed, non-empty, unique header becomes a property name, and every later record becomes one object with those properties.
How are commas and newlines inside values handled?
A delimiter or line break inside a double-quoted field remains part of that field. An unquoted delimiter ends the field, and an unquoted record break ends the row.
How do escaped double quotes work?
Inside a quoted CSV field, two adjacent double quotes represent one literal double quote. A stray quote or unexpected character after a closing quote is reported instead of guessed.
Can I use semicolon or tab-separated data?
Yes. Select semicolon or tab before converting. The selected separator must match the source data; this focused converter does not auto-detect a delimiter.
Are numbers and booleans converted automatically?
No. Every cell remains a JSON string, including values such as 00123, true, false, and null. This avoids silently changing identifiers, leading zeros, or user-entered text.
What happens if a row has a different number of fields?
The converter reports the first row whose field count differs from the header and does not create partial JSON. Fix missing or extra delimiters and unmatched quotes before converting again.
Can I convert CSV without a header row?
No. This focused converter creates named JSON objects, so add a header row with a unique, non-empty name for each column before converting.
Is my CSV uploaded?
The current page parses pasted text and one selected local file in this browser. It does not send the source or generated JSON to an external conversion service, requires no account, and limits input to 5 MB.
Can I download the converted JSON?
Yes. Download JSON saves the same array shown in the result panel, using either the selected two-space pretty format or compact minified format.
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