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Developer Tools

Free online developer tools including JSON formatter, Base64 encoder, and code utilities. No installation required, runs in your browser.

JSON Formatter

Format and validate JSON against RFC 8259 rules, catch single quotes, unquoted keys, and syntax errors instantly. Free private browser-based tool.

jsonformatvalidate

JSON Diff

Compare two JSON objects side by side and export JSON Patch (RFC 6902) with JSON Pointer paths for add, replace, remove, move, copy, and test operations.

json diffcompare jsonjson compare

JSON Schema Validator

Validate JSON data against a JSON Schema (Draft 7) with detailed error reporting. Free browser-based tool with example buttons and path-level diagnostics.

json schemajson validatorschema validation

JSON Converter

Convert between JSON, YAML, CSV, and XML formats instantly. Free browser-based tool with bidirectional conversion, no registration required.

json to yamljson to csvjson to xml

JSONPath Query

Query and extract data from JSON using JSONPath expressions. Supports recursive descent, wildcards, filters, and array slicing. Free online tool.

jsonpathjson path queryjson path finder

Base64 Encoder/Decoder

Base64 encoding and decoding tool for text, files, JWT segments, and data URIs. Instant browser-based conversion with no registration or data sharing.

base64encodedecode

Java Decompiler

Decompile Java .class files online, inspect bytecode, StringConcatFactory, invokedynamic, fields, and methods directly in your browser.

java decompilerclass file viewerbytecode disassembler

Why Use Developer Tools?

A collection of essential developer utilities designed to streamline your coding workflow. Format and validate JSON data, encode and decode Base64 strings, and debug data structures — all without leaving your browser. These tools support daily development tasks like API testing, data transformation, and debugging, saving you time and eliminating the need for installing desktop applications.

Frequently Asked Questions

Are the developer tools free?

Yes, all developer tools are completely free. No sign-up, API key, or installation is required.

Is my code processed on the server?

No. All processing runs locally in your browser. Sensitive data such as API keys, tokens, and credentials you paste into the tools never leave your machine.

What does the JSON Formatter do?

The JSON Formatter validates, formats, and syntax-highlights JSON data. It detects syntax errors and shows the line and character position of the problem, making it easy to debug malformed JSON.

What is Base64 encoding used for?

Base64 encodes binary data as ASCII text, which is commonly required for HTTP Authorization headers, data URIs, email attachments (MIME), and embedding binary content inside JSON payloads.

Can I use these tools for production debugging?

Yes. Because all processing is local, there is no risk of transmitting production data to a third-party server. These tools are suitable for debugging live API responses and data structures.