Convert CSV to JSON Online

Converting CSV to JSON produces an array of objects — one per row — where each object's keys are the CSV column headers. This is the format most web APIs, JavaScript applications, and NoSQL databases expect when they receive tabular data. The output is a valid JSON array ready to paste into a frontend, use as seed data for a development database, or POST to an API endpoint.

Typical use cases include seeding a development database with test records from a CSV export, converting a product catalogue or user list for a headless CMS, preparing bulk insert data for MongoDB or Firestore, and creating mock API response fixtures from real data. JSON's human-readable structure also makes it easier to inspect and debug than CSV when values contain commas or special characters.

CSV is inherently flat — all values start as strings. This converter infers types: numeric values become JSON numbers, true/false strings become JSON booleans, and everything else remains a string. If you need a nested JSON structure rather than a flat array of objects, the SQL Query tool lets you build custom JSON shapes using json_object() and struct_pack() functions.