Private browser-based code tools

Format and validate code in your browser. No uploads. No server processing.

Local Code Format is built for developers who need JSON, SQL, HTML, and diff tools that feel fast, stay trustworthy, and keep sensitive code on the machine where it already lives.

Open JSON Formatter Browse SQL Tools Read Practical Guides

Local-onlyFormatting runs in the browser, not on a remote server.

Task-firstThe tool is visible first, so you can get the job done without scrolling through filler.

Connected toolsMove from formatting to validation, SQL review, HTML cleanup, and diff checks without losing context.

Built for repeat useBookmarkable utilities for everyday debugging and cleanup work.

Start with the job you need to finish

Clean and format API JSON before you paste it into docs or tickets
Validate JSON before it breaks a request body or config file
Make long SQL queries readable before review or debugging
Compare text changes locally when you need a fast diff

Start with the tool you need

Pick the page that matches the job in front of you: formatting JSON, checking whether JSON is valid, cleaning up SQL, tidying HTML, or comparing two versions of text.

JSON Formatter

Pretty-print, minify, and clean JSON safely in the browser when you need a readable payload fast.

Open tool When to validate first

json formatterjson prettifier

JSON Validator

Check JSON validity, pinpoint parse errors, and move directly into formatting or repair.

Open tool Read guide

json validatorjson error finder

SQL Formatter

Make long SQL queries readable before review, debugging, or sharing a cleaned-up query with a teammate.

Open tool More SQL help

sql formatterpretty sql

HTML Formatter

Indent messy markup, improve readability, and inspect tag structure without leaving the browser.

Open tool HTML guide

html formatterhtml beautifier

Diff Checker

Compare two text blocks and spot line-by-line changes quickly when debugging code or content.

Open tool Comparison guide

diff checkertext compare

Why local-only matters

Read this when you need to know why browser-only tools are safer for request bodies, logs, queries, and config files.

Read guide All guides

privacy-firstbrowser-side

Pick the section that matches your job

Some visits are about fixing broken JSON. Others are about cleaning SQL, checking markup, or seeing exactly what changed. These sections help you get to the right page faster.

JSON cleanup and validation

Use these pages when you need to fix broken payloads, clean a response body, or make JSON readable before sharing it with a teammate.

SQL, HTML, and diff review

These pages are for the jobs that happen right after cleanup: making queries readable, inspecting markup, and spotting text changes before you ship them.

Use a guide when the tool is not enough

These guides help with the follow-up questions people usually have: whether to validate before formatting, how to handle sensitive payloads, how to avoid breaking HTML, and how to compare changes safely.

If you are working with JSON

Start here if you are trying to understand what tool to use, how to validate first, or how to avoid exposing sensitive payloads.

If you are reviewing SQL, HTML, or text changes

Use these when the problem is not “format this” but “help me inspect this safely and understand what changed.”

Your code stays in your browser while you work.

Use Local Code Format when you want to clean JSON, validate a payload, format SQL, inspect HTML, or compare text changes without pasting sensitive material into a random third-party tool. The goal is simple: help you finish the job fast and move to the next step without digging through filler.