CSV to JSON Converter
Turn a header-based CSV, semicolon-separated or tab-separated table into JSON objects without losing cell spelling.
Maximum 500,000 characters. Use synthetic examples instead of secrets.
Local processing · No account · Input is not uploaded by this tool
How to use this tool
- Choose the relevant options. Set the operation, format or algorithm before running. The options above define how the result is interpreted.
- Enter data or load an example. name,role followed by Alex,"Designer, UI" keeps the comma inside one role.
- Run and inspect the feedback. Use the primary action, then read the status message. An error clears old output so it cannot be mistaken for a fresh result.
- Copy, download or start again. Copy and Download become available when a current nonempty result exists. Reset clears the text result; no input is stored by this site.
How it works
A state-machine parser tracks quoted cells, escaped double quotes, embedded newlines and row boundaries. It validates unique headers and consistent row widths before serializing string-valued objects.
The computation is performed by this page’s JavaScript after you choose Run. Input and results are kept in the current tab’s memory. There is no background submission, analytics event containing your input, or server-side conversion in this build.
Practical example
Use Load example to try the supported format, then change one value and run again. Comparing those two results is a quick way to understand what the operation changes and what it preserves. The linked guides below provide worked examples for the edge cases relevant to this utility.
Common mistakes
Splitting at every comma breaks quoted cells. Leading zeros and booleans remain strings until a separate schema-driven transformation.
Limits and unsupported tasks
The first row must be a nonempty unique header. At least one data row is required. No type inference, arbitrary CSV dialect detection or spreadsheet formula sanitization. Maximum input: 500,000 characters.
Privacy and handling sensitive data
Tables can contain many personal records in a small sample. Replace them with artificial rows that preserve quoting, types and lengths needed for diagnosis. The parser reads the pasted text in memory and does not upload the CSV or converted JSON. Copy and Download use your device. Browser extensions and hosting logs have separate boundaries, explained in the privacy policy.
Usage guides
Questions, answered
Does the CSV to JSON Converter upload my input?
No. The implementation processes it in your browser and does not submit it to a server. Ordinary page requests still reach the hosting service.
Why did Copy or Download become unavailable?
The input changed or validation failed, so the previous output was cleared. Run the tool again to create a current result.
Can I use this for every production workflow?
The first row must be a nonempty unique header. At least one data row is required. No type inference, arbitrary CSV dialect detection or spreadsheet formula sanitization. Maximum input: 500,000 characters.