CSV to JSON Converter

Upload or paste CSV and get typed JSON arrays—processed entirely in your browser.

Delimiter:First row is headers

CSV Input

JSON Output

Turn tabular CSV into JSON

CSV is everywhere—exports from Excel, logs, and legacy systems. CalcForge reads delimiter-separated rows, maps headers to keys, and emits JSON arrays or objects you can feed to APIs, databases, or the rest of the CalcForge JSON toolkit.

Good fits

Importing spreadsheet exports into document stores or REST endpoints
Generating seed data for tests from business-user CSV files
Migrating flat files before YAML or XML conversion
Previewing row shapes before writing a custom ETL script

CSV:
name,score
Ada,98
Bob,87

JSON:
[{"name":"Ada","score":98},{"name":"Bob","score":87}]

Practical notes

Confirm delimiter and header row settings when columns look misaligned.
Quoted fields with embedded commas require proper CSV quoting—fix source rows first.
Large files run locally; split very big uploads if the tab becomes sluggish.

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Frequently asked questions

Does the first row become property names?

By default yes—each header becomes a JSON key. Toggle options on the page if your file has no header row.

Are numbers converted from strings?

Numeric-looking cells often parse as numbers when the converter detects valid formats. Verify types on critical columns.

Is my spreadsheet uploaded to a server?

No. Conversion runs in your browser unless you choose to share the file elsewhere.

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