Convert CSV files to JSON format instantly with our free online CSV to JSON converter. Output as array of objects, object with arrays, or nested structure. Auto type detection for numbers, booleans, and nulls. Pretty print or minify. No signup, processed in your browser.

Need to convert CSV to JSON for an API, app, or migration? Our CSV to JSON converter turns your tabular data into structured JSON in seconds. Paste or upload a .csv file, choose your output format (array of objects, object with arrays, or nested), and get valid JSON with optional type detection and pretty printing. Everything runs in your browser—your data never leaves your device.

What is CSV to JSON Conversion?

CSV to JSON conversion turns comma-separated (or other delimiter) tabular data into JSON (JavaScript Object Notation). CSV is a simple row-and-column format used in spreadsheets and exports; JSON is a structured format used by web APIs, configs, and apps. Converting CSV to JSON lets you feed spreadsheet or export data into modern systems that expect JSON—without writing code.

Why Choose Our CSV to JSON Converter?

Our tool is free, requires no signup, and runs entirely in your browser for full privacy. You get multiple output formats (array of objects, object with arrays, nested, with metadata), automatic type detection (numbers, booleans, nulls), pretty print or minified output, custom key prefix, control over empty values, transpose option, duplicate header handling, and JSON validation. Large files are supported with a progress indicator.

CSV to JSON Conversion Made Simple

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How to Convert CSV to JSON - Step by Step

Converting CSV to JSON with our tool takes three steps:

Step 1: Paste or upload your CSV: Type or paste CSV data into the box, or drag and drop a .csv file. The converter auto-detects delimiter (comma, semicolon, tab, pipe) and whether the first row is a header.

Step 2: Set options: Choose output format (array of objects, object with arrays, nested, or with metadata), enable pretty print or minify, set how empty values are handled, and optionally transpose rows and columns or add a key prefix.

Step 3: Convert and use: Click Convert to JSON. Copy the result to clipboard or download the .json file. The output is validated so you know it's valid JSON.

Features of Our CSV to JSON Converter

Our CSV to JSON converter includes:

• Output format selector: Array of objects (default), object with arrays, nested structure, or with metadata.
• Auto type detection: Numbers, booleans, and nulls are converted automatically, not just strings.
• Pretty print vs minify: Formatted JSON for readability or compact for production.
• Custom key prefix for generated object keys.
• Handle empty values: Skip null fields or include as null—your choice.
• Encoding support: UTF-8 and special characters, including non-Latin scripts.
• Transpose option: Swap rows and columns before converting.
• Duplicate header detection and auto-rename (e.g. name, name_2).
• JSON validation: Green check when output is valid JSON.
• Large file support: Handle 10MB+ files with progress bar.
• Processed in your browser. Your data never leaves your device.
• Completely free: No signup, no watermarks, no limits.

Convert CSV to JSON Today

Convert CSV to JSON in seconds with our free, in-browser tool. Whether you need an array of objects, nested JSON, or minified output for an API, we've got you covered.

No signup, no upload to servers—just paste or upload, set your options, and get valid JSON. Try it now.