Fix broken JSON
Use the validator to locate syntax errors, then jump to the guide for the most common parse failures.
Free Online Text, JSON & Developer Tools
FormatForge helps you format JSON, validate payloads, analyze text, generate URL slugs, debug regex, and convert structured data directly in the browser. It is built for practical work: fast output, clear structure, and local processing by default.
Best Starting Points
If you are new to the site, start here. These are the clearest first paths for the most common jobs.
Analyze text
Check word count, characters, reading time, and structure before publishing or reusing text.
Create clean slugs
Generate stable URL slugs and handle punctuation, spaces, and accented characters correctly.
Debug regex
Test the pattern live, inspect matches, and fix flags, escaping, or greedy behavior.
Text Tools
Remove Line Breaks & Clean Text
Fix copied text formatting, remove paragraph breaks, and join lines instantly.
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HTML Cleaner & Tag Stripper
Clean pasted HTML, remove inline styles, or strip HTML tags completely.
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Text Analysis Tool Online
Check word count, character count, reading time, sentence length, and paragraph structure instantly.
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Text Case Converter
Convert text to UPPERCASE, lowercase, Title Case, camelCase, or snake_case instantly.
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Remove Duplicate Lines
Quickly remove duplicate lines from a list to extract unique values.
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Text Diff Checker
Instantly compare two blocks of text to see what changed.
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Developer Tools
URL Slug Generator
Convert titles and text into clean, readable URL slugs for blogs, docs, and product pages.
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URL Encoder / Decoder
Safely escape or unescape characters for uniform resource locators.
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Base64 Encoder / Decoder
Convert strings to Base64 representation or decode them back to text instantly.
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Regex Tester Online
Run regex live, inspect matches, and understand each token step by step.
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JWT Decoder & Inspector
Decode token claims quickly for auth debugging and API diagnostics.
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JSON Tools
CSV to JSON Converter
Convert CSV to JSON and JSON arrays back to CSV in one step.
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JSON Formatter Online
Pretty-print valid JSON so it is easier to read, inspect, and document.
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JSON Validator Online
Find JSON syntax errors fast and see exactly where the payload breaks.
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JSON Minifier Online
Compress valid JSON into the smallest practical payload for transfer or storage.
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JSON -> TypeScript Interface Generator
Turn JSON payloads into TypeScript interfaces in seconds.
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XML <-> JSON Converter
Convert structured XML and JSON data both ways, fast.
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Data Diff (JSON / CSV Structured Diff)
Compare structured data by fields and paths, not just text lines.
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Popular Guides
Start with the guide if you need the why, then jump into the tool for the actual fix.
How to Format JSON Correctly
Learn how to format JSON correctly, fix invalid syntax, validate payloads, and minify for production with examples and debugging steps.
The Ultimate Guide to Text Cleaning and Normalization
How to prepare text data for AI models, databases, or content publishing by removing noise and duplicates.
NFC vs NFD: Unicode Normalization Explained
Understand NFC vs NFD, when to use each, and how Unicode normalization affects search, databases, APIs, slugs, and string comparison.
How to Debug Regex: Common Failures and Fixes
Learn how to debug regular expressions step by step. Fix greedy matches, multiline failures, escaping issues, and slow patterns with concrete examples.
Use the Right Path
Broken JSON
Start with JSON Validator. If the payload is valid and you only need readability, switch to JSON Formatter.
Messy Text
Start with Remove Line Breaks for pasted text or HTML Cleaner if the problem is markup noise.
Unicode or Slug Issues
Read NFC vs NFD first, then use the Slug Generator for consistent URL output.
Regex Problems
Use the Regex Tester for live inspection and the Regex Debugging guide for failure patterns.