JSON Formatter & Validator
Validate JSON, pretty print it with 2 or 4 spaces, or minify it to one line in your browser.
DEVELOPER · 4 TOOLS
Free Online Developer Tools
Format JSON, convert CSV, and encode or decode Base64 and URL strings in seconds. No install, no account, and nothing is uploaded.
CSV to JSON Converter
Convert CSV to JSON or JSON to CSV with comma, semicolon or tab delimiters and Excel-safe output.
Base64 Encode & Decode
Encode text to Base64 or decode Base64 back to readable UTF-8 text, including emoji and accents.
URL Encode & Decode
Percent-encode query values and URL components, or decode %20 and other %XX sequences to text.
Most of a developer's day is not spent on hard problems. It goes to small chores: reading a minified API response, turning a spreadsheet export into something a script can consume, checking what a Base64 string in a config file actually says, or figuring out why a query parameter breaks when it contains an ampersand. This category collects four focused utilities for exactly those moments: a JSON formatter and validator, a two-way CSV to JSON converter, a UTF-8 safe Base64 encoder and decoder, and a URL component encoder.
Every tool runs as JavaScript inside your browser tab. The JSON, CSV, tokens or URLs you paste are never sent to a Falanca server, logged or stored, which matters when a payload contains API keys, session tokens or customer records. Each tool accepts up to 1 MiB of input and produces up to 10 MiB of output, and when something is wrong it tells you what failed instead of returning a silent, broken result.
Which tool do you need?
Each tool does one job well. Use this quick guide to jump to the right one.
- JSON Formatter: pretty print a one-line API response, find the exact spot where a syntax error lives, or minify JSON before pasting it into a config.
- CSV to JSON Converter: turn a spreadsheet export into an array of objects, or flatten a JSON list into a CSV file that opens cleanly in Excel.
- Base64 Encode & Decode: encode text to Base64 or read a Base64 string from a header, environment variable or data field as plain UTF-8 text.
- URL Encode & Decode: safely put spaces, ampersands or accented letters into a query string value, or turn %XX sequences back into readable text.
Why browser-only processing matters for developers
Many online converters post your input to a server to process it. Once that happens, the content can end up in access logs, caches, analytics pipelines or third-party services you know nothing about. That is a real problem when the JSON you are debugging includes a bearer token or the CSV is a customer export.
Falanca does the conversion with code that runs locally, and the result only exists on your screen. Still, a safe tool cannot undo a leak that happened elsewhere: if a secret has already appeared in a screenshot, a shared screen or a chat log, revoke it at the provider and issue a new one.
Frequently asked questions
Are these developer tools free, and do I need an account?
Yes. All developer tools are completely free and work without registration. Open a tool, paste your data and press Convert. There is no daily usage cap; the only limits are per operation: 1 MiB of input and 10 MiB of output, plus 10,000 records and 50 columns for CSV and JSON conversions.
Is my data uploaded anywhere?
No. The tools run entirely in your browser using JavaScript, so the text you paste is processed on your own device and is not sent to Falanca or stored on a server. Closing or refreshing the tab clears it. This makes the tools a reasonable choice for JSON or URLs that contain tokens, though you should still avoid sharing secrets on screen.
Do the tools work offline or on mobile?
The tools work in any modern browser on desktop, tablet or phone. Because the processing happens locally, the conversion itself does not need a network connection once the page has loaded. You can copy the result to your clipboard or download it as a file, which is handy when you are working on a laptop with a slow or unreliable connection.