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+/* Copyright (C) 2023 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+/*!
+ * Simple pretty JSON writer.
+ */
+struct jsonw;
+typedef struct jsonw jsonw_t;
+
+/*!
+ * Create new JSON writer.
+ *
+ * @param out Output file stream.
+ * @param indent Indentation string.
+ *
+ * @return JSON writer or NULL for allocation error.
+ */
+jsonw_t *jsonw_new(FILE *out, const char *indent);
+
+/*!
+ * Free JSON writer created with jsonw_new.
+ */
+void jsonw_free(jsonw_t **w);
+
+/*!
+ * Write null value as JSON.
+ */
+void jsonw_null(jsonw_t *w, const char *key);
+
+/*!
+ * Start writing a new object.
+ *
+ * The following writes will represent key and value pairs respectively until
+ * jsonw_end is called.
+ */
+void jsonw_object(jsonw_t *w, const char *key);
+
+/*!
+ * Start writing a new list.
+ *
+ * The following writes will represent values until jsonw_end is called.
+ */
+void jsonw_list(jsonw_t *w, const char *key);
+
+/*!
+ * Write string as JSON. The string will be escaped properly.
+ */
+void jsonw_str(jsonw_t *w, const char *key, const char *value);
+
+/*!
+ * Write string with specified length as JSON. The string will be escaped properly, including \0.
+ */
+void jsonw_str_len(jsonw_t *w, const char *key, const uint8_t *value, size_t len, bool quote);
+
+/*!
+ * Write unsigned long value as JSON.
+ */
+void jsonw_ulong(jsonw_t *w, const char *key, unsigned long value);
+
+/*!
+ * Write integer as JSON.
+ */
+void jsonw_int(jsonw_t *w, const char *key, int value);
+
+/*!
+ * Write boolean value as JSON.
+ */
+void jsonw_bool(jsonw_t *w, const char *key, bool value);
+
+/*!
+ * Write binary data encoded to HEX as JSON.
+ */
+void jsonw_hex(jsonw_t *w, const char *key, const uint8_t *data, size_t len);
+
+/*!
+ * Terminate in-progress object or list.
+ */
+void jsonw_end(jsonw_t *w);