{"uid":"cap_lIIOdVTBt7QJIwUwwfk3c","slug":"agenttools-json-formatter-validator-434d57af","name":"AgentTools JSON Formatter & Validator","description":"Validate JSON with precise error messages, pretty-print it with any indent, and inspect its top-level type and element counts. Use this when an agent needs to validate, pretty-print and inspect JSON.","url":"https://agentstoolshub.com/api/v1/dev/json-formatter?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["json"],"properties":{"json":{"type":"string","description":"JSON"},"indent":{"type":"number","description":"Indent spaces"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_mfDsoCGdaCYWEcSXqjKG-","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates JSON with precise error messages, pretty-prints it with configurable indentation, and returns its top-level type and element count.","exampleAgentPrompt":"Can you validate this JSON and pretty-print it with 2-space indentation? Here it is: {\"name\":\"Alice\",\"age\":30,\"roles\":[\"admin\",\"user\"]}","exampleUseCases":[{"title":"Validate API response payload","prompt":"I got this JSON back from an API call — can you check if it's valid and tell me exactly where the error is if not? Here's the payload: {\"user\":\"bob\",\"score\":42,\"active\":true}"},{"title":"Pretty-print minified JSON for review","prompt":"This JSON is all squished onto one line and I can't read it — can you format it nicely with 4-space indentation? Here it is: {\"id\":1,\"items\":[{\"sku\":\"A1\",\"qty\":3},{\"sku\":\"B2\",\"qty\":1}]}"},{"title":"Inspect top-level JSON structure","prompt":"What's the top-level type of this JSON and how many elements does it have? Here's the string: [{\"a\":1},{\"b\":2},{\"c\":3}]"}],"resultDescription":"Returns whether the JSON is valid or not (with precise error messages if invalid), the pretty-printed version with the requested indentation, the top-level type (object, array, string, number, boolean, null), and the count of top-level elements.","failureModes":["Invalid or malformed JSON input returns a detailed parse error message with position or context","Missing required 'json' query parameter results in a 400 error","Non-JSON string passed as input triggers validation failure with explanation","Network timeout for very large JSON payloads"],"whenToPreferThis":"Choose this endpoint when an agent needs to validate JSON correctness with actionable error messages, reformat minified JSON for human or downstream readability, or quickly inspect the structure and size of a JSON value — all in a single call without standing up a local JSON parser.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T12:48:20.703Z","isFirstParty":false,"canonicalSlug":"agenttools-json-formatter-validator-434d57af"}