Free Developer Tools
Free tools for everyday developer tasks. They run entirely in your browser: nothing you paste is sent to a server.
JSON Validator
Free online JSON validator and formatter. Shows the exact line and column of each error and how to fix it, keeps large numbers exact, and runs entirely in your browser.
Open tool →JSON to Java Converter
Convert JSON to Java records, Lombok classes or POJOs online. Correct types for long IDs, dates and decimals, Jackson annotations for snake_case, and code that compiles.
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