About OneBuild
Free, beautifully designed developer tools — built with one simple rule: your data never leaves your browser.
What is OneBuild?
OneBuild is a free collection of developer utilities that run entirely in your browser. Whether you need to format a JSON blob, decode a JWT token, compare two config files, or convert a Base64 string — OneBuild does it instantly, with no sign-up and no data sent to any server.
The site was built out of frustration with tools that are cluttered, slow, or quietly upload your data to third-party servers. Every tool here is designed to be fast, clean, and completely private.
Privacy First
Every tool on OneBuild processes your data locally. The JSON you paste into the formatter, the JWT token you decode, the SQL you beautify — none of it ever leaves your device. There are no accounts, no history stored on our end, and no analytics that track what you type.
This is especially important for developers working with production data, API tokens, private keys, or sensitive configuration. You can use OneBuild tools with confidence that your data stays private.
The Tools
OneBuild currently offers 10 tools across JSON processing, encoding and decoding, and SQL formatting. New tools are added regularly based on what developers actually need day to day.
JSON Formatter
Format and beautify your JSON data with proper indentation. Supports syntax highlighting, folding, and search.
JSON Fixer
Automatically fix common JSON errors like trailing commas, missing quotes, and invalid syntax.
JSON to Table
Convert JSON data (including nested objects) into a beautiful tabular format. Supports sorting, drag-and-drop reordering, and column hiding.
JSON Diff
Compare two JSON strings side-by-side with inline diff highlighting. Optionally format before comparing to ignore whitespace differences.
Base64 Encoder
Encode text, files and images to Base64 instantly. Supports UTF-8, GBK, URL-safe format, and image preview.
Base64 Decoder
Decode Base64 strings back to text, files and images instantly. Supports multiple charsets and image preview.
JWT Decoder
Decode and inspect JSON Web Tokens (JWT) instantly. View header, payload and claims. Optionally verify the signature with your secret or public key.
JWT Encoder
Create and sign JSON Web Tokens (JWT). Supports HS256, RS256, ES256, EdDSA and more. All signing runs in your browser via the Web Crypto API.
SQL Formatter
Format and beautify SQL queries with proper indentation and keyword casing. Supports MySQL, PostgreSQL, SQLite, T-SQL, BigQuery. Includes one-click minify and copy.
MyBatis Log Formatter
Convert MyBatis debug logs into executable SQL by merging Preparing and Parameters lines. Supports all common Java types and formats the resulting SQL.
Core Principles
Free, always
Every tool is and will remain completely free to use. No premium tiers, no feature gates.
No sign-up required
Open the page, use the tool, close the tab. We don't ask for your email or create an account.
Browser-only processing
All logic runs in your browser using JavaScript and Web APIs. Your input never touches our servers.
Works everywhere
Tools are tested on modern desktop and mobile browsers. No installs, no plugins.
Contact
Have a question, found a bug, or want to suggest a new tool? Feel free to reach out.
[email protected]