JSON formatter online: format, beautify, and validate JSON against RFC 8259, catching single quotes, unquoted keys, and syntax errors instantly. Free tool.
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.
Validate JSON data against a JSON Schema (Draft 7) with detailed error reporting. Free browser-based tool with example buttons and path-level diagnostics.
Convert between JSON, YAML, CSV, and XML formats instantly. Free browser-based tool with bidirectional conversion, no registration required.
Query and extract data from JSON using JSONPath expressions. Supports recursive descent, wildcards, filters, and array slicing. Free online tool.
Base64 encoding and decoding tool for text, files, JWT segments, and data URIs. Instant browser-based conversion with no registration or data sharing.
Free online Java decompiler for .class and JAR files. Decompile bytecode and inspect fields, methods, and invokedynamic in your browser — nothing uploaded.
Free online regex tester and debugger. Highlight matches live, inspect capture groups, run substitutions, and test JavaScript regex flags. 100% private.
Decode and inspect JWT tokens in your browser. See the header, payload, claims, and expiry, and verify signatures locally. Your token is never uploaded.
Free online ASCII converter. Turn text into decimal, hex, octal or binary character codes and back, with UTF-8 bytes, Unicode names and blocks. 100% private.
Why Use Developer Tools?
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.