Free & Open Source

Format, validate & convert your code — instantly

Developer-first tools for JSON, XML, YAML, SQL, and 10+ languages. Everything runs in your browser — no data stored, ever.

Frequently Asked Questions

What is a JSON Formatter?

A JSON Formatter is a developer tool that takes raw, unformatted (minified) JSON (JavaScript Object Notation) data and restructures it with proper indentation, line breaks, and whitespace. This process, often called 'beautifying' or 'pretty printing,' makes the structured data readable for humans, helping developers analyze, debug, and inspect JSON payloads quickly.

How do I format JSON online?

You can format JSON online instantly using FormatForge. Simply paste your raw or minified JSON text into the input editor of our JSON Formatter. The tool will automatically parse the data, check it for syntax errors, and display a beautifully formatted, color-coded version. You can then copy the prettified code or download it directly to your device.

How do I validate JSON data?

To validate JSON data, paste your text into our JSON Validator. The tool parses the string against official JSON specifications (RFC 8259). If your JSON is valid, the tool confirms success. If there are syntax issues (such as trailing commas, mismatched brackets, or missing quotes), the validator will pinpoint the exact line number and column where the error occurred so you can fix it immediately.

What is the difference between JSON formatting and validation?

JSON formatting focuses on the visual presentation of valid JSON data by adding indentation, spacing, and line breaks to make it human-readable. JSON validation, on the other hand, verifies that the data strictly complies with JSON syntax rules. You can format data only if it is syntactically valid; if validation fails, formatting cannot be completed until the structural syntax errors are resolved.

How do I fix invalid JSON errors?

Invalid JSON errors are usually caused by syntax mistakes. To fix them, paste your JSON into the FormatForge JSON Validator. Look at the error message, which will highlight the line and character where the issue was detected. Common fixes include: adding double quotes around keys and string values, removing trailing commas after the last item in objects or arrays, and ensuring all brackets ({}, []) are properly closed and matched.

What is JSON pretty print?

JSON pretty print is the process of styling a JSON string so that its nested hierarchy is clearly visible using indentation, line breaks, and syntax highlighting. While computers can parse minified JSON without spacing, humans require a 'pretty printed' layout structure to understand the relationships and keys within complex nested objects and arrays.

Can I format large JSON files online?

Yes, with FormatForge you can safely format and edit large JSON files. Because our tools execute entirely client-side in your browser using high-performance JavaScript engines, there is no server-side payload limit or network latency. Your browser's memory and CPU are the only constraints, allowing you to format files up to several megabytes easily.

Is my JSON data secure when using this formatter?

Absolutely. Security and privacy are core to FormatForge. Unlike other online tools that transmit your data to remote servers for processing, all our formatting, validation, and conversion tools run entirely client-side within your browser. None of your data, proprietary code, or keys ever leave your local machine or are stored on any server.

Can I convert JSON to XML online?

Yes, you can convert JSON to XML online using our dedicated JSON to XML converter. It parses your JSON keys and arrays, translating them into corresponding XML tags and hierarchies. Once converted, you can copy the XML output or download the file instantly, all processed securely in your browser.

Can I convert JSON to YAML online?

Yes, you can easily convert JSON to YAML online with FormatForge. Since JSON is technically a subset of YAML, the conversion is clean and preserves your hierarchical configuration data. The JSON to YAML tool outputs a clean, indentation-based YAML string, which is ideal for Docker, Kubernetes, and general CI/CD pipeline configuration files.

What is an XML Formatter?

An XML Formatter is a utility that organizes Extensible Markup Language (XML) documents by adding proper nesting, indentation, and line breaks. This makes the raw XML elements, attributes, and text nodes readable and easier to inspect, ensuring that structural relationships are immediately clear to developers.

How do I format XML online?

To format XML online, paste your unformatted XML markup into the FormatForge XML Formatter. The tool parses the document structure and automatically outputs a cleanly indented version with syntax highlighting. It runs entirely local to your browser, ensuring quick execution and complete privacy.

How do I validate XML files?

You can validate XML files by pasting your XML into our XML Validator. The tool performs a syntax check to ensure the document is 'well-formed' (meaning all tags are correctly closed, nested properly, and attribute values are quoted). If there is a parsing error, it highlights the exact location and reason for the failure.

Can I convert XML to JSON online?

Yes, FormatForge provides a secure XML to JSON converter. It parses your XML document's tags, attributes, and child nodes, translating them into nested JSON objects and arrays. This conversion is extremely useful when consuming legacy XML APIs and transforming the payloads for modern frontend applications.

What is a YAML Formatter?

A YAML Formatter is a developer tool designed to clean up and structure YAML (YAML Ain't Markup Language) data. Since YAML relies strictly on precise whitespace and indentation for its hierarchy rather than brackets or tags, a YAML formatter helps ensure that spacing is uniform and that the structure represents the intended configuration hierarchy.

How do I validate YAML files?

You can validate YAML configurations by pasting them into our YAML Validator. Since YAML syntax errors are frequently caused by incorrect indentation levels (like mixing tabs and spaces) or misplaced colons, the validator runs a syntax check and flags the exact line where the schema structure or parser failed.

What is a SQL Formatter?

A SQL Formatter is an online utility that takes raw, single-line, or poorly styled database queries and formats them. It applies consistent capitalization to SQL keywords (like SELECT, JOIN, WHERE, INSERT) and aligns query clauses, making complex database commands easier to read, review, and maintain.

How do I format SQL queries online?

Paste your database query into the FormatForge SQL Formatter. The tool will automatically clean up the query structure, align the columns, indent joins and subqueries, and capitalize SQL standard keywords. This instant formatting helps you spot errors and optimize query reviews before execution.

What is a Base64 Decoder?

A Base64 Decoder is a tool that converts Base64 encoded ASCII strings back into their original binary data or plain text. Base64 encoding is commonly used to safely transmit binary assets (like images or credentials) over text-based protocols (like HTML, CSS, or JSON) without data corruption.

How do I encode and decode URLs online?

You can encode and decode URLs securely using our URL Encoder/Decoder. URL encoding (or percent-encoding) replaces unsafe characters in a URL with '%' followed by two hexadecimal digits (e.g., spaces become '%20'). URL decoding reverses this process, returning percent-encoded parameters to their human-readable plain text characters.

What is a JWT Decoder?

A JWT (JSON Web Token) Decoder is a tool that inspects the three parts of a JWT: the Header, the Payload, and the Signature. It decodes the Base64Url-encoded segments client-side, showing you the cryptographic algorithms used, the claims inside the payload (like user roles, issuer, and expiration time), without sending the token over the internet.

How do I beautify code online?

To beautify code online, select the appropriate formatter on FormatForge (such as JavaScript, HTML, CSS, SQL, or JSON) and paste your unformatted code. The tool will instantly restyle the code with standard indentation rules, bracket spacing, and syntax highlighting, allowing you to paste clean, readable snippets into your IDE.

FormatForge: The Ultimate Developer-First Online Tool Suite

In modern software development, data formatting, validation, and encoding represent daily workflows that can either accelerate developer velocity or introduce tedious friction. FormatForge is engineered to be a comprehensive, privacy-focused, and lightning-fast developer workspace featuring over 20 essential formatting, minification, conversion, and validation tools. Running entirely client-side inside your browser, FormatForge guarantees that none of your proprietary code or payload data is transmitted over the network, providing an ultra-secure sandbox for daily engineering tasks. With full offline capabilities and an editor experience powered by Monaco, FormatForge stands as a premium, secure alternative to traditional online tools.

Advanced JSON Formatting and Inspection Utilities

JSON has become the primary data format for web APIs, microservice integrations, and state distribution. FormatForge offers a premium json formatter and json beautifier designed to parse messy, unindented payloads into readable, structured models. For developers debugging raw API responses, our json pretty print tool restores indentation and applies syntax highlighting, while the integrated json viewer allows you to navigate large nested structures. If you need to verify data integrity, the json validator and json parser provide line-by-line syntax diagnostics to pinpoint missing commas, invalid brackets, or trailing characters. Conversely, when preparing configurations for production deployment or API requests, the json minifier compresses payload files by removing unnecessary whitespace, indentation, and carriage returns, reducing payload size instantly.

Cross-Format Conversions and Structured Data Validators

Working with multi-service architectures often requires converting structured configurations. FormatForge provides powerful, schema-aware converters to transition datasets seamlessly. You can convert JSON documents to other formats using the json to xml and json to yaml converters. If you are consuming external legacy feeds, the xml to json and yaml to json components will parse and structure the payload instantly. For markup and configuration management, FormatForge includes a robust xml formatter, an xml validator, and an xml beautifier to indent and check XML schemas. Similarly, our yaml formatter and yaml validator ensure that indentations in YAML files align perfectly with standard specification structures, avoiding syntax traps that cause container initialization failures in Docker or Kubernetes deployments.

High-Performance Code Beautifiers

Reading unformatted or compressed source code is a developer's bottleneck. FormatForge features high-quality source formatters for frontend and backend languages. Clean up database queries with our sql formatter, which formats select statements, joins, and constraints with proper keyword capitalization. Format and indent web code using the javascript formatter, html formatter, and css formatter to ensure linting-compliant styles, clean code formatting, and structural visibility in seconds.

Encoding, Decoding, and Security Tools

Secure transmission of payload strings often necessitates raw encodings. FormatForge hosts a suite of utility decoders. Use our base64 encoder to convert text to Base64 instantly, and the base64 decoder to parse base64 strings back. For query string management and HTTP parameters, the url encoder transforms special characters into percent-encoded entities, while the url decoder returns them to plain text. For identity verification and microservice communication, use the jwt decoder to inspect and verify JSON Web Token headers, payloads, and claims expiration structures client-side. Additionally, generate unique cryptographic markers in bulk using our online uuid generator supporting v4 and v1 standards for database primary keys.

Text Processing and Diagnostics

Managing raw data strings often requires structural cleanup. FormatForge provides automated text actions. The word counter offers word and character diagnostics for content creators. If you are cleaning up configuration lists or database keys, the remove duplicate lines action deduplicates entries in one click. For checking regular expressions in codebase development, our regex tester evaluates patterns with global and case-insensitive matching. Finally, compare two documents side-by-side to highlight additions or deletions using the text compare diff utility. Everything on FormatForge is free, fast, and runs locally.