Developer Tools
Convert, format, validate, and clean developer data formats.
Featured tools
The high-traffic ones in this category.
JSON to CSV Converter Pro
Convert JSON or NDJSON arrays into CSV with file drop, column reorder, flatten, and Excel BOM.
CSV to JSON Converter Pro
Convert CSV rows into a JSON array with file drop, header detection, and type inference.
Nested JSON to CSV Converter
Flatten nested JSON objects into CSV using dot notation column keys.
JSON Formatter and Validator
Validate, pretty-print, and minify JSON with clear parse error messages.
YAML to JSON Converter
Convert YAML configuration and data files into JSON for APIs and apps.
JSON to YAML Converter
Convert JSON objects into readable YAML configuration files.
Guides
Longer reads that link back to the tools.
Resources
Concept explainers that link back to the tools.
What Is JSON?
JSON is a lightweight text format for structured data—arrays, objects, strings, numbers, booleans, and null.
JSON vs CSV for Data Exchange
JSON preserves hierarchy and types; CSV is flat and spreadsheet-friendly. Choose based on your consumer.
Flattening Nested JSON for CSV
Nested JSON must be flattened to dot-notation or similar columns before most CSV and Excel workflows.
YAML vs JSON Explained
YAML and JSON both serialize structured data; JSON is stricter and universal for APIs, while YAML favors human-readable config files.
What Is Base64 Encoding?
Base64 encodes binary data as ASCII text using 64 safe characters, enabling transport in JSON, email, and URLs.
CSV Encoding and Excel Compatibility
CSV files need consistent character encoding and delimiter conventions or Excel and import tools misread columns and special characters.
XML vs JSON for Data Exchange
XML and JSON both represent structured data; JSON is leaner for modern APIs while XML remains in enterprise, document, and legacy integrations.
URL Encoding Explained
URL encoding (percent-encoding) replaces unsafe ASCII characters in URLs with %XX hex codes so links parse correctly.
About developer tools
Free online converters and developer tools to convert JSON, CSV, YAML, and XML; format and validate structured data; encode Base64 and URLs; and generate test data — all in your browser with no upload required.
- Convert API responses from JSON to CSV for Excel
- Validate and pretty-print JSON configs
- Transform YAML DevOps files to JSON
- Encode strings for URLs and HTML entities
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